exec

exec

 [

command

]

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.

Examples

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.