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UNIX in a Nutshell: System V Edition

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The C Shell
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onintr label
onintr -

"On interrupt." Used in shell scripts to handle interrupt signals (similar to the Bourne shell's trap 2 and trap "" 2 commands). The first form is like a goto label. The script will branch to label: if it catches an interrupt signal (e.g., CTRL-C). The second form lets the script ignore interrupts. This is useful at the beginning of a script or before any code segment that needs to run unhindered (e.g., when moving files). The third form restores interrupt handling that was previously disabled with onintr -.


onintr cleanup     # go to "cleanup" on interrupt
 .                 # shell script commands
cleanup:           # label for interrupts
  onintr -         # ignore additional interrupts
  rm -f $tmpfiles  # remove any files created
  exit 2           # exit with an error status

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