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The 6 test patterns that real-world Bash scripts actually use

Check if a file is really a file, whether a string contains anything, and whether you can run a program with these vital patterns.
Network World

Bash: A primer for more effective use of the Linux bash shell

While Linux systems install with thousands of commands, bash also supplies a large number of “built-ins”—commands that are not sitting in the file system as separate files, but are part of bash itself ...