Chapter Summary
The shell is a programming language. Programs written in this language are called shell scripts, or simply scripts. Shell scripts provide the decision and looping control structures present in high-level programming languages while allowing easy access to system utilities and user programs. Shell scripts can also use functions to modularize and simplify complex tasks.
The Bourne Again and Z Shell control structures that use decisions to select alternatives are if…then, if…then…else, and if…then…elif. The case control structure provides a multiway branch and can be used when you want to express alternatives, using a simple pattern-matching syntax.
The test builtin can evaluate an expression in a shell script. The expression is ...
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