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UNIX in a Nutshell: System V Edition

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The Bourne Shell and Korn Shell
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Execute command in place of the current process (instead of creating a new process). exec is also useful for opening, closing, or copying file descriptors.


trap 'exec 2>&-' 0	
Close standard error when 

shell script exits (signal 0).


exec /bin/csh

Replace Bourne shell with C shell.


exec < infile

Reassign standard input to infile.

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