The all too often underappreciated shell script is limited in power only by the ability of the person writing it. Every operation undertaken in a shell script, beyond the simplest grouping of commands, requires an examination of conditions. All shell script "Logic" - to use the term in its loosest sense - can usually be broken into one of three following broad categories: if {condition exists} then ..., while {condition exists} do ..., and until {condition exists} do ... Regardless of the subsequent action, each of these logic-based commands is dependent on knowing if a condition truly exists. The test command is the utility that makes it possible in every situation to determine whether or not the condition in question exists.
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