ONINTR(1CSH)            COMMAND REFERENCE            ONINTR(1CSH)



NAME
     onintr - interrupt handling (csh built-in)

SYNOPSIS
     onintr [ - ]
     onintr [ label ]

DESCRIPTION
     The command onintr is used in shell scripts to handle
     interrupts.  If no arguments are given, the default
     interrupt handling, which is usually to abort the program,
     is restored.  With the argument -, interrupts are ignored.
     With a label argument, interrupts cause the command goto
     label to be executed.  Interrupts may either be received by
     the shell or by a child process to be handled by the onintr
     control.

     If a shell is running detached and interrupts are being
     ignored, onintr commands are ignored.

EXAMPLES
     The following shell script builds a file from all files
     named on the command line, and moves the file to the file
     named by the environment variable OUTPUTFILE.  The resulting
     file contains no lines beginning with the character `#'.
     The onintr command is used to abort the script if an
     interrupt is received during the file building, and is used
     to ignore interrupts during the file move.

          #!/bin/csh -f
          #
          # First, make sure that the variable OUTPUTFILE is set.
          #

          if ($?OUTPUTFILE == 0) then
               echo "$0 : OUTPUTFILE variable not set."
               exit 1
          endif

          onintr abort

          cp /dev/null /tmp/output.$$
          foreach name ($argv)
               grep -v '^#' "$name" >> /tmp/output.$$
          end

          onintr -
          mv /tmp/output.$$ "$OUTPUTFILE"
          exit
          #
          # Interrupt handling.
          #



Printed 4/6/89                                                  1

ONINTR(1CSH)            COMMAND REFERENCE            ONINTR(1CSH)



          abort:
               echo "$0 : Aborting. $OUTPUTFILE not updated."
               exit 1

DIAGNOSTICS
     onintr: Can't from terminal.
                    The onintr command can only be used in shell
                    scripts.  This message occurs whenever onintr
                    is invoked from a terminal.

RETURN VALUE
     [NO_ERRS]      Command completed without error.

     [1]            The command was invoked from a terminal.

CAVEATS
     In csh(1csh), only interrupts and hangups (see nohup(1csh))
     can be ignored, and only interrupts can be caught.  If more
     control over signals is required, sh(1sh) should be used.

SEE ALSO
     @(1csh), alias(1csh), bg(1csh), break(1csh), cd(1csh),
     chdir(1csh), continue(1csh), csh(1csh), dirs(1csh),
     echo(1csh), eval(1csh), exec(1csh), 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), popd(1csh),
     pushd(1csh), rehash(1csh), repeat(1csh), set(1csh),
     setenv(1csh), sh(1sh), shift(1csh), source(1csh),
     stop(1csh), suspend(1csh), time(1csh), trap(1sh),
     umask(1csh), unhash(1csh), unalias(1csh), unlimit(1csh),
     unset(1csh), unsetenv(1csh), wait(1csh), which(1csh), and
     signal(3c).






















Printed 4/6/89                                                  2

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sy:484,270;
de:754,938;
ex:1692,1115;3239,102;
di:3341,456;
rv:3797,239;
ca:4036,314;
se:4350,1577;
%%index%%000000000145