Introduction to UNIX and shell cripting

Confidential to Trianz Inc. • 1 Confidential to Trianz Inc. • 2 • Introduction to Unix and its architecture • Learn to use basic Unix commands • Learn to use vi editor • Learn to write shell scripts • Learn to register and run shell scripts from oracle applications Confidential to Trianz Inc. What is UNIX ? UNIX is an operating system co-created by AT&T Bell Labs researchers Dennis Ritchie and Ken Thompson in the late 1960s. Unix is a multitasking, multiuser, programming environment. • 3 Confidential to Trianz Inc. • 4 Confidential to Trianz Inc. Kernel – is the single large program which resides in the memory which is the operating system. It manages File system, Memory, I/O and Processes. Shell – is a command interpreter which provides the user interface for the UNIX operating system. • 5 Confidential to Trianz Inc.  HP-UX - HP UNIX developed by HP  SunOS and Solaris – Developed by Sun Microsystems  AIX – Developed by IBM  SCO Unix – Developed by SCO  Linux - Free Source code  BSD – Berkley Software Design • 6 Confidential to Trianz Inc.  Bourne shell (sh)  C shell (csh)  TC shell (tcsh)  Korn shell (ksh)  Bourne Again SHell (bash) • 7 Confidential to Trianz Inc. Bourne C TC Korn BASH Command history No Yes Yes Yes Yes Command alias No Yes Yes Yes Yes Shell scripts Yes Yes Yes Yes Yes Filename completion No Yes* Yes Yes* Yes Command line editing No No Yes Yes* Yes Job control No Yes Yes Yes Yes • 8 * not the default setting for this shell Confidential to Trianz Inc. There are three types of file access supported by UNIX.  r – read, view the contents of a file or a directory  w – write, edit file/directory contents  x – execute, run executable file • 9 Confidential to Trianz Inc. • 10 - rwx r-x r 1 user1 oracle 858 Feb 22 22:28 file1.txt type owner group size Modification date/time File name User permissions Group permissions Other Permissions links For example: Suppose you type in ls -l and the result is [...]... a shell script should start with a line: #!/bin/ksh Example shell script #!/bin/bash echo “Hello $USER” echo “Today is “ `date` echo “You are in directory $PWD” exit 0 Confidential to Trianz Inc •20 Ex: ls –lrt, myshell.sh oracle $1 to $9 – will give the arguments 1 to 9 To get remaining we need to use shift command $@ - will give the complete list of all the arguments to that shell Confidential to. .. The shell script can have either of the 2 extensions .prog or sh prog : 1 Create a soft link to the shell without extension to $FND_TOP/bin/fndcpesr Ex: ln -s $FND_TOP/bin/fndcpesr $FND_TOP/bin/TEST 2 Grant execute permission to the both the files (.prog and the file without extension) Ex: chmod +x TEST.prog TEST sh : No need to create a soft link Confidential to Trianz Inc •27 Differences b/w prog and. ..ls - List directory contents cd - Change the current directory cp - Copy files and directories mv - Move (rename) files mkdir - Make a directory rm - Remove files or directories (Use with Caution) rmdir – Delete a directory (Use with Caution) echo – Display a line of text Confidential to Trianz Inc •11 cat – Concatenate files and print on the std output date – Print the system date and time head –... bytes, words, and lines in files ln - Make links between files Confidential to Trianz Inc •13 alias/unalias - Shorthand for a command or commands sort - Sort lines of text files exit – Exit the current shell with status shift – Shift positional parameters env – Display the environment variables logout - Exit a login shell Confidential to Trianz Inc •14 There are 2 types of variables in Unix Environment... types of variables in Unix Environment variables  Shell variables  As per conventions environment variables will be in uppercase and Shell variables will be in lowercase Example : APPL_TOP=/srv/115102/inst/visappl pathseg=/home/oracle/bin today=`date` export – to export the variable to the environment Confidential to Trianz Inc •15 Redirection operators: Output redirection : >, |, >> Input redirection... is greater than $x” fi Confidential to Trianz Inc •22 For loops for name in w1 w2 do command-list done Example: for X in red green blue do echo $X done Confidential to Trianz Inc •23 While Loops while command-list1 do command-list2 done Example: x=0 while [ $x -le 20 ] do echo $x x=`expr $x + 1` done Confidential to Trianz Inc •24 $? - returns 0 if the last command is executed successfully, else non... Example: cat test1 test2 > test3 cat test2 >> test1 ls –l | grep new sort < test.txt > sortedtest.txt Confidential to Trianz Inc •16 vi – Visual text editor vi - to open the any text file in vi editor Two modes of vi Command mode – Esc key  Insert mode – a or i  Confidential to Trianz Inc •17 a - enter append mode i - enter insert mode h - move cursor left j - move cursor down k - move... last command PID run in bg (using &) $$ - returns the current shell PID Confidential to Trianz Inc •25 sqlplus -s /@ @/ Example 1: sqlplus -s $UID/$PWD@$CONSTR@$EXECDIR/sql/oa_com_monitor_cmrun Example 2 : st_date=`sqlplus -s $UID/$PWD@$CONSTR . Confidential to Trianz Inc. • 1 Confidential to Trianz Inc. • 2 • Introduction to Unix and its architecture • Learn to use basic Unix commands • Learn to use vi editor • Learn to write shell scripts • Learn. I/O and Processes. Shell – is a command interpreter which provides the user interface for the UNIX operating system. • 5 Confidential to Trianz Inc.  HP-UX - HP UNIX developed by HP  SunOS and. -l and the result is Confidential to Trianz Inc. ls - List directory contents cd - Change the current directory cp - Copy files and directories mv - Move (rename) files mkdir - Make a directory rm