Korn Shell Script Writing

Source: www.osc.edu
Topic: Shell Programming

Short Desciption:
A shell script is an executable file which is executed by the. shell linebyline. It can contain the following:. UNIX commands. shell programming ...

 

Content Inside:
Korn Shell Script WritingPage 11Korn Shell Script WritingScience & Technology Support GroupHigh Performance ComputingOSC (Ohio Supercomputer Center)1224 Kinnear RoadColumbus OH 43212Page 22Basic 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 ExercisesPage 33Creating a Shell Script A shell script is an executable file which is executed by the shell linebyline. 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/shuses Bourne shell to execute script #!/bin/cshuses C shell to execute script etc... Page 44Executing a Shell ScriptThere are 3 ways to execute a shell script: 1."dot" method $ . scriptname2."just the name" method $ scriptname3.in the background$ scriptname &Page 55Executing 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 for scriptname chmod +x scriptname current directory (.) must be in PATH or else must use ./scriptnamePage 66Executing a Shell Script (cont.)cat list # a simple little shell scriptprint "A listing of $PWD " > list.outls l >> list.out For methods 2 and 3 the shell runs another copy of itself as a subprocess. Pictorially the difference between Methods 1 2 and 3 is: Page 77Functions Improves shell's programmability already in memory (unless autoloaded) modular programing Syntax: function functname {shell commands}orfunctname (){shell commands}Page 88Functions (cont.) Delete a function definition with $ unset f functname Display all defined functions: $ functionsPage 99Functions (cont.) Two important differences between functions and she ...

 

 

 

 

unix korn shell script guide, basic unix korn shell scripting tutorial, korn shell cookbook, korn shell sheet, kshell function, korn scripting cheat sheets, ksh shell scripting cheat sheet, ksh shell cheat sheet, ksh cheat sheet, execute unix command in kshell, free nikon cheat sheets, kshell programming string manipulation, kshell script in cshell, korn she script, korne unix commands cheat sheet and examples, in korn shell display, executing a shell script in sap, unix commands cheat sheets pdf, kshell example to execute program, download nikon cheat sheet