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exec [command args ...]
exec [-a name ] [-c ] [command args ... ]

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. The second form is for ksh93 only.



Use name for the value of argv[0] .


Clear the environment before executing the program.


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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