Bourne/bash shell script functions

Writing functions can greatly simplify a program. If a chunk of code is used multiple times in different parts of a script, the code can be enclosed within a function and run using only the function name.

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Bourne/bash shell script: while loop syntax

A while loop allows execution of a code block an arbitrary number of times until a condition is met. This recipe describes the while loop syntax for the various Bourne shells (sh, ksh, bash, zsh, etc.) and provides examples.

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csh/C shell scripts: for loop syntax

A for loop allows a program to iterate over a set of values. For loops in a C shell script are a useful means of iterating through files or other lists. This recipe describes the for loop syntax and provides some examples.

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csh/C shell scripts: if statement syntax

Conditional expressions give programs life. The ability to branch makes shell scripts powerful. This recipe shows the basic if then else structure for csh, the C shell.

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Hide password entry in Bourne/bash shell script

Common practice for inputing passwords is to read the text without displaying it on the screen. The UNIX Bourne shell does not have this functionality as a command, but a combination of commands will make this work.

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Bourne/bash shell script for loop syntax

A for loop allows a program to iterate over a set of values. For loops in a Bourne shell script (sh, ksh, bash, zsh, etc.) are a useful means of iterating through files or other lists. This recipe describes the for loop syntax and provides some examples.

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Bourne/bash shell scripts: case statement

The case statement is an elegant replacement for if/then/else if/else statements when making numerous comparisons. This recipe describes the case statement syntax for the Bourne shells (sh, ksh, bash, zsh, etc.).

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Bourne/bash shell scripts: string comparison

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