Korn Shell Script Writing

Source: www.osc.edu
Topic: Shell Programming

Short Desciption:
2 Basic Shell Programming • Creating a Shell Script • Executing a Shell Script • Functions • Precedence of Commands • eval • Shell Variables • Assigning Variable Names • • ...

 

Content Inside:
1 Korn Shell Script Writing Science & Technology Support Group High Performance Computing OSC (Ohio Supercomputer Center) 1224 Kinnear Road Columbus, OH  43212 2 Basic Shell Programming • Creating a Shell Script • Executing a Shell Script • Functions • Precedence of Commands • eval • Shell Variables • Assigning Variable Names • • Null Variables • Special Shell Variables • Parameter Substitution • Special Pattern Matching Features • Command Substitution • Exercises 3 Creating a Shell Script • A shell script is an executable file which is executed by the shell line-by-line. It can contain the following: -UNIX commands -shell programming statements -comments • Create using editor of choice • Can include a #! construct in first line of script to override login shell -#!/bin/sh usesBourneshell to execute script -#!/bin/csh uses C shell to execute script -etc. 4 Executing a Shell Script There are 3 ways to execute a shell script: 1."dot"  method $. scriptname 2."just the name" method $scriptname 3.in the background $scriptname& 5 Executing a Shell Script (cont.) • Method 1 runs the command as if you typed them in on the command line • Note that methods 2 and 3 require: -execute permission forscriptname chmod+xscriptname -current directory (.) must be in PATH or else must use ./scriptname 6 Executing a Shell Script (cont.) cat list #asimplelittle shell script print "Alistingof$PWD ">list.out ls-l>>list.out • For methods 2 and 3 the shell runs another copy of itself as asubprocess. Pictorially, the difference between Methods 1, 2, and 3 is: 7 Functions • Improves shells programmability -already in memory (unlessautoloaded) -modular programing • Syntax: function functname{ shell commands } or, functname () { shell commands } 8 Functions (cont.) • Delete a function definition wi ...

 

 

korn shell variables pdf, basics of script writing pdf, korn shel, unix ksh script ls color, rss to pdf shel script, ps1 digital unix bin sh, how to add the number by 1 in ksh script, script writing method, writing in color with korn shell, korn shell script l functions, writing shell scripts in batch, why shell script, kornshell scripts, ksh programming exercises, what is in ksh script, shel programming, difference between shell programing and batch programing, what is shel script, using diff in a ksh script, korn shel pwd