Tutorial of Unix Command & shell scriptS 5027 Professor: Dr. Shu-Ching Chen TA: Samira Pouyanfar Spring 2017

Outline Log in Unix Basic Commands Shell script

Outline Log in Unix Basic Commands Shell script

How to log in Download putty from http://www.chiark.greenend.org.uk/~sgtatham/putty/ download.html PuTTY is a free implementation of Telnet and SSH for Windows and Unix platforms

Connect to the server The host is margay.cs.fiu.edu 1 2 3 4

Log in / Account information Login as : Your FIU username Password : Your first initial + PantherID + Your last initial For exmaple, Steven Jackson with PID 1234567 should have password s1234567j

Log in in Mac systems Use the existing ssh tool in your mac called "Terminal" by following the steps: - Search for "Terminal" from spotlight, e.g., located on the upper right corner of your screen - Open Terminal - Connect to the server margay.cs.fiu.edu using following commands ssh hha001@margay.cs.fiu.edu replace hha001 with your fiu account - Type your password - Now, you are connected.

Log in in Mac systems

Outline Log in Unix Basic Commands Shell script

Commands about Files (1) ls : list the contents of your current directory. Format Options -a : list all the files include the hidden ones -l : list not only the files name but also the related info -t : list the contents by modified date ls [option] [directory][file]

Commands about Files (2) File permission Field1 : A set of ten permission flags Field2 : link count Field3 : owner of the file Field4 : associated group of the file Field5 : size Field 6-8 : Last modification date Field9 : file name

Commands about Files (3) chmod : change the permission flags of the files Format Example chmod g+w myfile chmod g-rw myfile chmod u=rw go= myfile chmod –R g+rw myfile chmod [option] [types][+/-][types of permission] filename Who: u=user, g=group, o=other, a=all (default) Opcode: + means add permission - means remove permission = means assign permission and remove the permission of unspecified fields Permission r=Read, w=write, x=Execute

Commands about Files (4) pwd : print out the current working directory cd : change directory cd . (.) means the current directory C (..) means the parent of current directory Cd cd with no argument will return you to your home directory cd . cd .. cd Use the commands cd, ls and pwd to explore the file system.

Commands about Files (5) cp : copy files Format Options -i : It can be used to avoid overwriting the original file -r : Copy the folder and all the files and subfolders under it. mv : move a file from one place to another or rename a file. cp [option] File1 File2 mv File1 File2

Commands about Files (6) mkdir : making directory Format rm : remove files or directories Option -i : ask before actually delete -r : delete the folders and all the files and subfolders under it mkdir Directory_name rm [option] file1 file2 file3…

Commands about Files (7) test : A command in Unix that evaluates conditional expressions. Format or The functions will return true if the object exist or the condition specified is true. File functions -d Filename : Filename is a directory -s Filename : Filename has a size greater than 0 -f Filename : Filename is a regular file test expression [ expression ]

Commands about File’s contents (1) cat : display the contents of a file on the screen Format head : display the first ten lines of a file to the screen tail : display the last ten lines of a file to the screen cat file1 head –n file1 tail –n file1

Commands about File’s contents (2) wc : word count Format Options -w : find out how many words the file has -l : find out how many lines the file has -m: find out how many characters the file has wc [options] file

Commands about File’s contents (3) grep : It searches files for the specified words or patterns. Format: Options: -c : Display the number of columns which satisfied the pattern. -i : Ignore case distinctions in both the PATTERN and the input files. -v : Invert the sense of matching, to select non-matching lines. grep [options] [pattern] file

Pipe : It cause the execution of multiple processes from one single line A | B | C

Commands about File’s contents (4) Redirection > and >> can be used on the output of most commands to direct their output to a file. Examples

Commands about Text processing (1) sort : sort lines of a text file or files Default : sort without any option will sort the file alphabetically Format uniq : remove duplicate adjacent lines from sorted file. sort [option] file

Commands about Text processing (2) sed: One ultimate stream editor Detail Tutorial : http://www.grymoire.com/Unix/Sed.html Important function -> Substitution Format : sed 's/term1/term2/g‘ filename

Commands about Text processing (3) cut : extract sections from each line of a file. Format Option -c : character -f : field -d “:” : delimiter (default is a tab) Range N-M N- -M cut [options] [range] filename

Outline Log in Unix Basic Commands Shell script

Shell script intro (1) Scripts are collections of commands that are stored in a file. Detail Tutorial http://www.freeos.com/guides/lsst/ Basic Vi commands vim filename i : switch to the editing(insert) mode Esc +:q! Leave the vim program without saving the file Esc +:w Save the file Esc +:wq Save the file and leave the vim program

Shell script intro (2) First shell script Note that to make a file executable, you must set the eXecutable bit, and for a shell script, the Readable bit must also be set.

Shell script intro (3) Variable

Shell script intro (4) IF LOOP

Shell script intro (5) For Loop

Shell Script Intro (6) Useful concept $( commands)