Ppt on shell scripting examples

Shell Programming, or Scripting Shirley Moore CPS 5401 Fall 2013 August 29, 2013 1.

.sh and close the file: #!/bin/bash echo “Hello, World!” echo “Knowledge is power.” Make the file executable $ chmod +x hello.sh Execute the file $./hello.sh 8 Shell Comments Example: #!/bin/bash # A Simple Shell Script To Get Linux Network Information # Vivek Gite - 30/Aug/2009 echo "Current date : $(date) @ $(hostname)" echo "Network configuration" /sbin/ifconfig Lines beginning with # are ignored by Bash/


Nic Shulver, Scripts and Batch files Scripting in Windows and Linux What is scripting? What is it for? DOS/Windows batch files.

: $sTextInput #exit 0 Type in a message This is a simple bash demonstration $sTextInput is: This is a simple bash demonstration Nic Shulver, N.A.Shulver@staffs.ac.uk Scripts and Batch files Example shell scripts #!/bin/Bash # be sure the directory /mnt exists if [ ! -d /mnt ] then mkdir /mnt fi for i in /mnt/floppy/*; do if [ -f $i ]; then # if the file/


Chapter 6: Shell Programming Shell Scripts. Using the UNIX Shell as a Programming Objectives: After studying this lesson, you should be able to: –Learn.

two parameters! echo You are inputting $#argv parameters. else set par1 = $argv[1] set par2 = $argv[2] endif Decision Logic (continued) Another example: #! /bin/csh # number is positive, zero or negative echo "enter a number:" set number = $< if ( $number < 0 ) then echo/must be converted into a low- level (machine) language before the computer can execute it The shell interprets UNIX shell scripts UNIX shell scripts, created with the vi or other editor, contain instructions that do not need to be written /


An Introduction to Unix Shell Scripting. UNIX Shells /bin/sh –Borne Shell /bin/csh – C Shell /bin/ksh – Korn Shell /bin/bash Borne Again Shell.

inside “ echo "You have `ls | wc -l` files in your directory" Outputs  You have 24 files in your directory Shell Arithmetic - The Bourne shell has no idea how to do arithmetic - For example number=2 number=$number + 4 echo $number 2 + 4 - That makes shell scripting pretty useless as a programming language doesnt it? expr - Fortunately, there is a Unix command that will allow us/


Windows Scripting Host. Using Windows Scripting Host David Stevenson Senior Software Engineer, ABB Automation

Bring up the default application for any extension (ex..xls,.doc,.txt) Set shell = CreateObject ( "WScript.Shell" ) shell.run "note.txt” b Run Windows Explorer using Run Set shell = CreateObject ( "WScript.Shell" ) shell.run "c:" shell.run Chr(34) & "E:Windows Script Host" & Chr(34) Run Examples - Advanced 2 b Bring up Mail Window Set shell = CreateObject ( "WScript.Shell" ) shell.run "mailto:drs2@frontiernet.net;stevenso@eng14.rochny.uspra.abb.com” b/


School of Computer Science and Information Technology Devi Ahilya Vishwavidyalaya Shell Scripting

.scs@dauniv.ac.in The Shebang (#!)  The Shebang is a special comment.  It specifies which shell to use to execute this shell script.  If no “#!” found, the current shell will be used to run the script.  Example #!/bin/ksh SCSIT DAVV hmehta.scs@dauniv.ac.in Two ways to execute the Shell  Set the permission attributes as a executable file then execute it like a command. OR/


LINUX System : Lecture 6 Shell Programming. UNIX is designed so that users can extend the functionality To build new tools easily and efficiently To customize.

execute. Any commands you enter in response to a shell prompt. A utility A compiled program Another shell script Control flow commands Run a shell script Enter the script filename on the command line The shell interprets and execute the commands one after another Why shell script? Simply and quickly initiate a complex series of tasks or a repetitive procedure. Shell script example #!/bin/csh echo “Current Time - `date`” echo I am/


Linux Operations and Administration Chapter Five Creating Shell Scripts and Displaying File Contents.

to machine code, line by line, as the user runs the script 14 Linux Operations and Administration Creating Shell Scripts (cont’d.) In Chapter 5: BASH shell interpreter Create a shell script: –Create a file –Assign execute permission for it Run a shell script: –Enter the absolute or relative path to where it’s stored –Example: run a script called scr1 that’s stored in your current directory./scr1 15/


UNIX Shell Script (1) Dr. Tran, Van Hoai Faculty of Computer Science and Engineering HCMC Uni. of Technology

arithmetic processor eval Evaluate variables date Create date strings head/tail Access lines in files Dr. Tran, Van Hoai 2007 UNIX Shell Script Example (script) (1) #!/bin/bash alphabet="a b c d e" # Initialise a string count=0 # Initialise a counter for/$count + 1` # Increment the counter # Display the result echo "Letter $count is [$letter]" done Dr. Tran, Van Hoai 2007 UNIX Shell Script Example (script) (2) alphabet="a b c d e" # Initialise a string count=0 # Initialise a counter while [ $count -lt 5 ] #/


LINUX programming UNIT-2 1. INDEX UNIT-IV PPT SLIDES Srl. No. Module as per Session planner Lecture No. PPT Slide No. 1.Working with Bourne shell L1 1-2.

’t test a condition but uses a list instead. Syntax: for variable in list do commands done The list here comprises a series of character strings separated by whitespace. 51 Shell script examples Example #!/bin/sh echo "Is it morning? (Answer yes or no)" read timeofday if [ $timeofday = "yes" ]; then echo "Good Morning" else echo "Good afternoon" fi exit 0 52 elif - Doing further/


1. 2 What is a Shell Script? A Text File With Instructions Executable  Why shell script? Simply and quickly initiate a complex series of tasks or a.

test-command ; then commands else commands fi 73 Debugging Shell Scripts You can use the shell’s –x option to help debug a script. This option causes the shell to display each command before it runs the command Example Bash –x./if2 74 Enable shell options You can set the an option of the shell running the script by running the set command You can set the an option/


240-491 Adv. UNIX:CShell/71 Advanced UNIX v Objectives of these slides: –introduce the C Shell –concentrate on features not in the Bourne Shell (but many.

.logout –.logout in your home directory continued 240-491 Adv. UNIX:CShell/753  When a shell script is called, the shell will execute the cshrc scripts first.  The cshrc scripts are also executed whenever a new window is created in a X- Windows session. 240-491 Adv. UNIX:CShell/754 Examples v $ cat.login setenv TERM vt100 stty erase ‘^X’ kill ‘^U’ -lcase -tabs echo “This/


Www.ischool.drexel.edu INFO 320 Server Technology I Week 5 Shell environments and scripting 1INFO 320 week 5.

have an underline between_words 27INFO 320 week 5 www.ischool.drexel.edu Environment variables For example, your default shell is $SHELL To view the current value of an environment variable the echo command can be used –echo $SHELL There are also environment variables within scripting, which depend on the type of shell you’re using 28INFO 320 week 5 www.ischool.drexel.edu Environment variables There/


CS252: Systems Programming Ninghui Li Slides by Prof. Gustavo Rodriguez-Rivera Topic 7: Unix Tools and Shell Scripts.

is there, then it runs the interpreter program and passes the file as input. hello.sh - Example of a Shell Script #!/bin/bash # # This shell script prints some data about the user # and shows how to use environment variables # echo "Hello $USER/ cd ~cs252 Variable expansion $: Environment var, or other var in a script Command substitution $(command) or `command` Replace result of command execution there files.sh - Example of a Shell Script #!/bin/bash # This print the file names in current directory # twice/


L INUX A DMINISTRATION Pandian Ganesan. AGENDA Linux Introduction User Administration Linux Networking Filesystem Management Basic Shell Scripting Q&A.

special backslash_escaped symbols are expanded during the output. If such expansions are required the – e option must be used. User Input During Shell Script Execution As shown on the example script input from the standard input location is done via the read command. Example echo "Please enter three filenames:” read filea fileb filec echo “These files are used:$filea $fileb $filec” Each read statement reads/


Tool Building 1: Shell CS 360 tool1. Page 2 tools1 CS 360, WSU Vancouver What is Systems Programming? (again) hardware drivers OS services system programs.

in all workstations 4... Such tools manipulate files and directories Page 4 tools1 CS 360, WSU Vancouver What Does the Shell Provide?  Interactive interface to all system capabilities 4 navigate & manipulate file system 4 invoke system commands & programs 4/foo "doug > Page 23 tools1 CS 360, WSU Vancouver Whiteboard Exercises Examples of scripts and pipelines I love Unix Page 24 tools1 CS 360, WSU Vancouver Some Word Scripts This is a example docment, with some words. This is on line two (which follows /


UNIX Shell Script (2) Dr. Tran, Van Hoai Faculty of Computer Science and Engineering HCMC Uni. of Technology

in while list return non-zero until list; do list; done performs until last command in while list return zero Dr. Tran, Van Hoai 2007 UNIX Shell Script Example (7) #!/bin/bash while read line do f1=`echo $line | tr " " " " | cut –f1` f2=`echo $line | tr "/ = list of commands between { and } Exit status = that of last command Define a local variable local myvar Dr. Tran, Van Hoai 2007 UNIX Shell Script Example (9) #!/bin/bash myfac(){ local fac=1 x for (( x=1; x<=$1; x++ )) do fac=$(( $fac * $x )) done echo/


1 Writing Shell Scripts Professor Ching-Chi Hsu 1998 年 4 月.

) ex. echo -n enter command set cmd=$< eval $cmd Using Variables –Positional parameters $1,$2,… –special variables such as $cwd and $nomatch –Environment variables,$HOME –ordinary variables 14 Write Shell Scripts(13) Example: ccp ##script name:ccp ##conditional copy ## ##usage: ## ccp from to[file….] ##where: ## ‘from’ is the source directory ## ‘to’ is the destination directory ## [file…] is a list of optional file names to/


Chapter 4 The UNIX Shells (Bourne shell, Korn shell, C shell)‏ Graham Glass and King Ables, UNIX for Programmers and Users, Third Edition, Pearson Prentice.

lastname=He sh-3.2$ echo $firstname $lastname Jing He B UILT -I N V ARIABLES $$ the process ID of the shell $0 the name of the shell script $1..$9 $n refers to the n th command line argument $* a list of all command-line arguments E XAMPLE Q UOTING/ Whenever a file is created E.g. made by vi or by redirection File permissions (usually 666) masked with umask value Example: 022 to produce the permission 644 U MASK E XAMPLE umask Command To see current umask value: $ umask To change umask value: $ /


Linux Administration Working with the BASH Shell.

shell script –Defines which shell is used to interpret shell script commands 26 Shell Scripts (continued) Executing shell scripts with read permission: –Start another BASH shell, specify the shell script as an argument Executing shell scripts with read/write permission: –Executed like any executable program How to write shell script Use any editor like vi or vim to write shell script. After writing shell script set execute permission for your script/If Else & Numeric Comparison Example-2 #!/bin/bash # /


1 CSE 391 Lecture 5 Intro to shell scripting slides created by Marty Stepp, modified by Jessica Miller & Ruth Anderson

 Shows who is currently logged on & info about processor commanddescription echo produces its parameter(s) as output (the println of shell scripting) -n flag to remove newline ( print vs println ) 7 Script example #!/bin/bash clear# please do not use clear in your hw scripts! echo "Todays date is `date`" echo echo "These users are currently connected:" w -h | sort echo echo "This is `uname/


1 Advanced UNIX Objectives of these slides: Introduce the C Shell Concentrate on features not in the Bourne Shell (but many are in Bash) The C Shell.

your home directory At logout, it executes: /etc/csh.logout.logout in your home directory 51 When a shell script is called, the shell will execute the cshrc scripts first. The cshrc scripts are also executed whenever a new window is created in a X- Windows session. 52 Examples $ cat.login setenv TERM vt100 stty erase ^X kill ^U -lcase -tabs echo This is who is/


A Guide to Unix Using Linux Fourth Edition

’s date and time are: Mon Feb 9 21:49:45 MST 2009 A Guide to Unix Using Linux, Fourth Edition Creating Functions Inside Shell Scripts Example: a shell script called .myfuncs You may start .myfuncs from your .bash_profile or .bashrc login script, or the command line sort_name() { sort -k 2 -t: corp_phones } sort_job() sort -k 6 -t: corp_phones sort_dept() sort -k 5 -t: corp_phones A/


Content Linux Shells and Shell Scripts C-Shell and tcshell tcsh, enhanced C-Shell bash, Bourne-Again Shell.

are they for? –To automate certain common activities an user performs routinely. –They serve the same purpose as batch files in DOS/Windows. –Example: rename 1000 files from upper case to lowercase What are Shell Scripts Just text/ASCII files with: –a set of standard UNIX/Linux commands ( ls, mv, cp, less, cat, etc.) along with flow of control –some conditional logic and/


Introduction to Linux Shell Script Programming Summer course, Institute of Bioinformatics National Yang-Ming University.

statement and [ or ] is necessary Advanced Example Analyze your host ~ (2) Case  syntax and example case variable in value_1) [statements_1] ;; value_2) [statements_2] ;; value_3) [statements_3] ;; *) [statements_for_exception] esac Fortune Teller Loops for loop  syntax: for (( initial value; stop criteria; increment/decrement )) do [statements] done  simple test The sum from 1 to 100 Do what gauss has done by shell script while loop and until loop  syntax/


Lecture 5 Awk and Shell. Sed Drawbacks Hard to remember text from one line to another Not possible to go backward in the file No way to do forward references.

be interpreted –If #! is not specified, the current shell assumes it is a script in its own language leads to problems Simple Example #!/bin/sh echo Hello World Scripting vs. C Programming Advantages of shell scripts –Easy to work with other programs –Easy to work with files –Easy to work with strings –Great for prototyping. No compilation Disadvantages of shell scripts –Slow –Not well suited for algorithms & data/


NCKU unix.administration 1 Bourne Shell (sh) rotation #!/bin/sh # Rotate procmail log files cd /homes/arensb/Mail rm procmail.log.6 # This is redundant.

readonly variable_name` $person=Kathleen $readonly person $person=Irene $-sh: a: readonly variable $example=Richard $readonly example $readonly readonly person readonly example $ readonly command displays a list of all the read-only variables. NCKU unix.administration 12/null) NCKU unix.administration 68 Homework #3 1. Write a shell script that only shows the directory names. In other words, the regular file names are not shown. 2. Write a shell script that can remove the comments from a C program and output/


Bourne Shell1-1 Borne Shell  Background m Early Unix shell that was written by Steve Bourne of AT&T Bell Lab. m Basic shell provided with many commercial.

a shell script m It stores a series of commands for execution at a later time. m The shell stores functions in the memory m Shell executes a shell function in the same shell that called it.  Where to define m In.profile m In your script m Or in command line  Remove a function m Use unset built-in Bourne Shell1-32 functions  Syntax function_name() { commands }  Example/


Shell Programming Learning Objectives: 1. To understand the some basic utilities of UNIX File 2. To compare UNIX shell and popular shell 3. To learn the.

. To understand the some basic utilities of UNIX File 2. To compare UNIX shell and popular shell 3. To learn the basic components in constructing a Shell Script (program) COMP111 Lecture 6 / Slide 2 Shell Programming Table of Content (1)  ShellsShells ScriptsShell Scripts - ExampleShell Variables  User input  Special Symbol -- $  Simple calculation using expr  Backquotes  Command substitution  Example Table of Content (2)  More Programming Components :  Control flow  if  if … then … else/


CSc 352 Shell Scripts Saumya Debray Dept. of Computer Science

example a shell script to print “hello world!” the “echo” command, as executed from the command line contents of the shell script file “hello_world.script” this script behaves the same for a variety of different shells with appropriate permissions, the script can be executed directly Syntax issues across shells Different shells have slightly different syntax rules the same script may not work on all shells: script contents different behaviors Which shell runs my script? my current shell/


Bash Shell Scripting 10 Second Guide Common environment variables PATH - Sets the search path for any executable command. Similar to the PATH variable.

. $? - Exit status of the last command. The above symbols are known as positional parameters. Let me explain the positional parameters with the aid of an example. Suppose I have a shell script called my_script.sh. Now I execute this script in the command line as follows : $./my_script.sh linux is a robust OSlinux... as you can see above, I have passed 5 parameters to/


Xuan Guo Chapter 4 The UNIX Shells Graham Glass and King Ables, UNIX for Programmers and Users, Third Edition, Pearson Prentice Hall, 2003. Original Notes.

36 Xuan Guo Built-in Variables Common built-in variables with special meaning: $$ process ID of shell $0 name of shell script (if applicable)‏ $1..$9 $n refers to the nth command –line argument (if applicable)‏ $* a list of all command line arguments CSC 3320 37 Xuan Guo Example using Built-in variables $ cat script2.sh #!/bin/bash echo the name of this file/


1 UNIX essentials (hands-on) the directory tree running programs the shell (using the T-shell) → command line processing → special characters → command.

shells are case sensitive when processing a command → command examples:  echo the home directory of $USER is $HOME  ls ~/AFNI_data2 ~/AFNI_data2/misc_files/all_stims.1D → script: an interpreted program (interpreted by another program) e.g. shell script, javascript, perl script, afni startup script consider the c00.all script/? ls I.0[123]* ls I.0[^123]* echo I.0[^123]* 12 Shell Scripts → a text file, a sequence of shell commands → the character can be used for line continuation (for readability) for that /


1 LINUX Shell Scripting Advanced Issues Yusuf Altunel.

loop 3 read The read Statement read variable1, variable2,...variableN Use to get input (data from user) from keyboard and store (data) to variable. Syntax: read variable1, variable2,...variableN Example: Write a shell script to  first ask user, name  then waits to enter name from the user via keyboard.  Then user enters name from keyboard (after giving name you have to press ENTER/


Chapter 10 Shell scripting. Overview 2  How to write a simple BASH shell script  Use of common programming elements (variables, loops, etc)  How to.

 How to use common UNIX tools to parse and manipulate text files Introduction 3  Shell scripts are used for automating processes throughout a computer  Basic knowledge of shell scripting necessary for all system administrators  Traditionally on Unix systems, now also Windows  PowerShell  Agenda  Examples of common structures and procedures used in all shell scripts  Later, combine some of these common elements  Demonstrate automation of processes that would/


Chapter 15 Introductory Bash Programming To introduce the concept of shell programming To describe how shell programs are executed To discuss how command.

“Another way: $@.” echo “Yet Another way: $*.” exit 0 $./ cmdargs_demo..... Introductory Bash Programming 15.4 Passing Arguments To Shell Scripts Syntax shift [N] Example: $ cat shift_demo #!/bin/bash echo The command program name is $0. echo The arguments are $@. echo The first /Wed May 14 03:18:04 EEST 2008 $ echo $1, $2 and $4 Introductory Bash Programming 15.4 Passing Arguments To Shell Scripts (Contd)‏ Example: $ cat set-1 #!/bin/bash filename=output.txt set $(ls)‏ echo $@ echo echo $1 $2 echo $1 $2/


Copyright © 2009 Elsevier Chapter 13 :: Scripting Languages Programming Language Pragmatics Michael L. Scott.

(predating Perl and Tcl by almost a decade, and Ruby and Python by even longer). –Beyond text processing and shell features, these offer more full-featured scripting languages provide extensive libraries of OS control. –Examples: File IO, process management, security, network/socket access, timing, synchronization. –In a sense, just as text-processing mechanisms minimize the need to use external tools like sed, awk/


1 Operating Systems Lecture 3 Shell Scripts. 2 Brief review of unix1.txt n Glob Construct (metacharacters) and other special characters F ?, *, [] F Ex.

# to the end of the line. 3. All shell scripts begin with the interpreter you want to use: #!/bin/bash Example: #!/bin/bash who | grep ycjiang exit 0 7 Running a shell script To run a UNIX script: 1)Type the script into a file. 2)Change the file permission to executable/spaces around + #!/bin/bash i=1 i=`expr $i+1` echo $i #prints out 1+1 exit 0 14 Using Arguments with a Shell script Example command: >myShell arg1 arg2 arg3 arg1 is accessed by $1, arg2 is accessed by $2, etc. Question: What is accessed by $/


Copyright © 2009 Elsevier Chapter 13 :: Scripting Languages Programming Language Pragmatics Michael L. Scott.

(predating Perl and Tcl by almost a decade, and Ruby and Python by even longer). –Beyond text processing and shell features, these offer more full-featured scripting languages provide extensive libraries of OS control. –Examples: File IO, process management, security, network/socket access, timing, synchronization. –In a sense, just as text-processing mechanisms minimize the need to use external tools like sed, awk/


8 Shell Programming Mauro Jaskelioff. Introduction Environment variables –How to use and assign them –Your PATH variable Introduction to shell programming.

-cslinux 1]$./done.sh done.sh done [zlizmj@unnc-cslinux 1]$ Input and Output The first argument to a shell script is called $1 The second argument to a shell script is called $2 ….etc… Shell uses echo like Java’s println Input and Output: An Example [zlizmj@unnc-cslinux 1]$ cat firstarg.sh #!/bin/sh #Print first argument echo $1 [zlizmj@unnc-cslinux 1]$./firstarg/


The Linux OS stack: Introduction to shell, system calls & kernel.

place them in certain startup script n Every shell uses atleast one startup script in the user’s home directory. This script is executed when the user logs in. n This login script should be added to your home directory at the time of user creation. CS591 (Spring 2001) Shell constructs : case condition n Case expression in Pattern1) commands1;; Pattern2) commands2;;. Esac Example program CS591 (Spring 2001/


Korn Shell Programming1 AIX Ver. 4 Korn Shell Programming.

Functions Defining Functions command 는 그룹과 함께 이름지어 질수 있음. command 의 설정은 Funtion 의 Body 를 구성함. Funtion 정의는... 아래와 같다. Bourne Korn Identifier () function identifier { { commands commands } } Korn Shell Programming33 CH6. Korn Shell Types, Commands & Functions Function Examples [ 참고 ] 샘플 스크립트 “test_function” # Handy for usage errors in Shell Scripts # Invoke function usage with arguments: script # followed by arglist. Note exit status ! function usage { prog="$1"; shift print -u2 "$prog: usage: $prog $@" exit/


Day 8,9,10 COP 3502 Introduction to Shell Scripts David A. Gaitros Department of Computer Science Florida State University.

needs to be completed over and over again. Your startup scripts are shell scripts.Your startup scripts are shell scripts. Simple Shell Scripts The following text is placed in a file called simpleThe following/example program called echo.argsHere is an example program called echo.args # Comment Line echo "Welcome to the echo shell program" echo "This is an example of positional parameters" echo "This program can handle up to nine (9) parameters" echo "You have typed $# arguments" Demonstration of shell script/


Lecture 4  C Shell Scripts(Chapter 10). Shell script/program  Shell script: a series of shell commands placed in an ASCII text file  Commands include.

the current directoryMake sure the PATH includes the current directory Run directly from the command lineRun directly from the command line Shell Script Example file./hello.sh: #!/usr/bin/csh -f echo Hello World % chmod +x./hello.sh %./hello.sh Expressions  C Shell expressions are used with @ or with (if/while) statements, where variable can be  Expression are formed by variables + operators  @ operator: assigns/


Shell Programming. An example u tr abcdefghijklmnopqrstuvwxyz thequickbrownfxjmpsvalzydg file2 –encrypts file1 into file2 u record this command with.

normal commands %./myencrypt file2 %./mydecrypt file3 % diff file1 file3 Shell Scripts (1) u A Shell Script is simply a text file with UNIX commands in it u Shell Scripts usually begin with a #! and a shell name –For example:#!/bin/sh –If they do not, the users current shell will be used u Any UNIX command can go in a Shell Script –these commands are executed in order or in the/


1 CSE 303 Lecture 5 bash continued: users/groups; permissions; intro to scripting read Linux Pocket Guide pp. 166-178 slides created by Marty Stepp

the date/time: The time is: 04/06 10:40  shows me an ASCII cow welcoming my user name commanddescription echo produces its parameter(s) as output (the println of shell scripting) 7 Script example #!/bin/bash clear echo "Todays date is `date`, this is week `date "+%V"`." echo echo "These users are currently connected:" w | grep -v USER | sort echo echo "This is/


Shell Programming Learning Objectives: 1. To understand the some basic utilities of UNIX File 2. To compare UNIX shell and popular shell 3. To learn the.

Learning Objectives: 1. To understand the some basic utilities of UNIX File 2. To compare UNIX shell and popular shell 3. To learn the basic components in constructing a Shell Script (program) Shell Programming Table of Content (1) Shells Shells Scripts Shell Scripts - Example Shell Variables User input Special Symbol -- $ Simple calculation using expr Backquotes –Command substitution –Example Table of Content (2)  More Programming Components :  Control flow  if  if … then … else  if … elif/


LIN 69321 Unix Lecture 5 Unix Shell Scripts. LIN 69322 Command Coordination ; && || command1 ; command2 Interpretation: Do command 1. Then do command.

the program csh to interpret the script contained in the file `filename. INDIRECT INTERPRETATION we insert as the first line of the file #! /bin/csh (by default) Or use the information given when you execute the command % echo $SHELL /usr/local/bin/tcsh AND the file must be made executable using chmod LIN 69327 A simple example: listfiles #! /usr/local/bin/tcsh echo/


Agenda Introduction to Shell Scripts Purpose of Shell Scripts Types of Shells / Running Shells Creating Simple Shell Scripts: Creating Portable Shell Scripts.

. Examples: # This shell script does… mkdir mydir # Command to create directory “mydir” If the command #! to specify which shell to run shell script in is not contained in first and second columns of first line respectively, the # is treated by shell like a comment and shell script is run in “default” shell! Shell ignores text Running Shell Scripts There are two methods of running shell scripts: Type the shell type with the name of the shell script as/


CSCI 330 UNIX and Network Programming Unit IX: Shell Scripts.

form of writing to standard output Syntax: echo [-ne] argument[s] -n suppresses trailing newline -e enables escape sequences: horizontal tab backspace aalert newline 7CSCI 330 - UNIX and Network Programming Examples: shell scripts with output #! /bin/bash echo "You are running these processes:" ps #! /bin/bash echo -ne "Dear $USER: Whats up this month:" cal 8CSCI 330 - UNIX and Network Programming Command line/


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