Linux in a Nutshell, Fourth Edition

Name

onintr

Synopsis

                  onintr 
                  label
                  onintr -
onintr
               

“On interrupt.” Used in shell scripts to handle interrupt signals (similar to bash’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 previously disabled with onintr -.

Example

                  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