Scripts may contain any valid UNIX command, beginning on the second line. Before running a shell script, you must reset the file's access privileges to make it executable. For more information on setting file access privileges, see Section 3.5, File Protection . Script Language Shell scripts are useful for tasks that are more complicated than executing a sequence of UNIX commands. Unix shell script language can match some of the advanced features of high-level programming languages.
Scripts can accept command-line arguments or strings from standard input.
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