IST 210 Introduction to UNIX (AIX) Todd Bacastow IST 210: Organization of Data

IST 210 Introduction to UNIX (AIX) UNIX developed at Bell Labs in 70s One of the oldest and most reliable OS Linux, SUN/Solaris are UNIX kernel with additional features

IST 210 Introduction to UNIX Basic Commands (like DOS prompt) List files - ls Copy files - cp file1 file2 Move/Rename files – mv file1 file2 Delete files – rm DANGEROUS COMMAND One can delete all his/her files by mistake Write alias rm ‘rm –i’ every time log on to play safe

IST 210 Introduction to UNIX Some more commands mkdir mydir – to make a new directory cd mydir – to change directory man mkdir – display help about a command cd - to come back to your home directory We will use ssh client to log onto UNIX machines

IST 210 Connect to IBM DB2 First log on to rs6klab.aset.psu.edu Enter username and password (CAC) Type the following commands >source /home/db2clnt/sqllib/db2cshrc >db2

IST 210 Inside IBM DB2 Some simple commands db2>list database directory – to show databases db2>connect to classale – to connect to a database db2>select * from pennstate.zipcodes Now you can start typing SQL Remember no semi-colons needed

IST 210 Dot notation Dot notation refers to prefixing the table names to column names, to avoid ambiguity, as such: SELECT S.sname FROM Sailors S, Reserves R WHERE S.sid = R.sid AND R.bid = 103 Or it can be used to identify [schema].[tablename] SELECT * FROM tsb4.names

IST 210 Example If user tsb4 creates the table ‘test’ as below: db2 => CREATE TABLE test (item1 INT,item2 CHAR(50)) db2 => INSERT INTO test VALUES (10, ‘Test’) you would have to access that users table by first connecting to tsb4 and then querying the table similar to the command below. Db2 => connect to tsb4 db2 => select * from tsb4.test

IST 210 Running SQL From File in UNIX Create a file ( create.sql ) with the SQL statements using PICO in the UNIX window: Connect to classale; Create Table Sample1(Partno Int, Partdesc Char(50)) 'cd' to the directory where you have stored the script. Type and run the following command: [UNIX Prompt]: db2 -tvf create.sql The parameter 't' refers that the default statement delimiter(;) has been used, 'v' represents verbose mode output and 'f' tells the command that the string following is the name of a file containing SQL Statements.