EXEC(1CSH)              COMMAND REFERENCE              EXEC(1CSH)



NAME
     exec - execute command in place of the current shell (csh
     built-in)

SYNOPSIS
     exec command [ arg... ]

DESCRIPTION
     The exec command executes the given command in place of the
     current shell.  Since there are a limited number of
     processes available for each user, it is useful to be able
     to execute the last command in place of the shell so that
     the process isn't hanging around with nothing to do.

     The command may not be a csh built-in.

EXAMPLES
     This example shows an interface to the command make(1),
     which can be used by someone with a lot of commands and
     directories to keep up with.  The environment variable
     MAKEDB contains the name of a file which contains entries of
     the form



          name<TAB>directory<TAB>description


     where the name is the name given to the script, the
     directory is the pathname of the directory where make should
     be run, and description is a message to be printed before
     executing the make command.



          #!/bin/csh -f
          set Myname=`basename $0`
          #
          # Check usage.
          #
          if ($#argv != 1) then
               echo "$Myname : usage : $Myname target"
               exit 1
          endif
          #
          # This awk script looks through the database for the entry.
          #
          eval `awk -Ft '{ if ($1 == name) { printf "set Dir=%s ;
          echo %s", $2, $3; exit; } }' name="$1" "$MAKEDB" `

          #
          # Change to the named directory and run the command.



Printed 10/17/86                                                1

EXEC(1CSH)              COMMAND REFERENCE              EXEC(1CSH)



          #

          cd "$Dir"
          exec make "$1"


     Note: the awk(1) script must be given on a single line.  It
     is split here for readability.

     Another use of exec is to exit the login shell without
     executing commands from the .logout file.  For example,
     executing the command ``exec clear'' in the login shell will
     clear the screen and log the user out.

VARIABLES
     PATH           The user's execution search path.

RETURN VALUE
     The return value is the return value of the command
     executed, or 1 if the command does not exist.

CAVEATS
     The exec command never returns, even if the command was not
     found.

SEE ALSO
     @(1csh), alias(1csh), bg(1csh), break(1csh), cd(1csh),
     chdir(1csh), continue(1csh), csh(1csh), dirs(1csh),
     echo(1csh), eval(1csh), exec(1sh), exit(1csh), fg(1csh),
     glob(1csh), goto(1csh), hashstat(1csh), history(1csh),
     jobs(1csh), kill(1csh), limit(1csh), logout(1csh),
     nice(1csh), nohup(1csh), notify(1csh), onintr(1csh),
     popd(1csh), pushd(1csh), rehash(1csh), repeat(1csh),
     set(1csh), setenv(1csh), sh(1sh), shift(1csh), source(1csh),
     stop(1csh), suspend(1csh), time(1csh), umask(1csh),
     unhash(1csh), unalias(1csh), unlimit(1csh), unset(1csh),
     unsetenv(1csh), wait(1csh), which(1csh), execve(2), fork(2).


















Printed 10/17/86                                                2

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sy:198,131;
de:329,487;
ex:816,1227;2187,438;
va:2625,119;
rv:2744,188;
ca:2932,152;
se:3084,1558;
%%index%%000000000143