4TWEAKING UNIX
An outsider might imagine Unix as a nice, uniform command line experience across many different systems, helped by their compliance with the POSIX standards. But anyone who’s ever used more than one Unix system knows how much they can vary within these broad parameters. You’d be hard-pressed to find a Unix or Linux box that doesn’t have ls as a standard command, for example, but does your version support the --color flag? Does your version of the Bourne shell support variable slicing (like ${var:0:2})?
Perhaps one of the most valuable uses of shell scripts is tweaking your particular flavor of Unix to make it more like other systems. ...
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