Korn Shell Programming by Example

trap

Official Description

Traps a signal to be serviced by a signal handler.

Syntax

trap [argument][signal ...] | [-p]

Options

-p prints the currently trapped signals.

Oddities

If the argument is omitted or is -, all traps associated with signals are reset to their original values.

Example

$ trap –p                    # No signals being trapped yet
$
$ trap 'print "Trapped"' INT QUIT # Trap INT (CTRL+C) and QUIT (CTRL+\)
$
$ trap –p                    # Print signals being trapped
trap -- 'print "Trapped"' QUIT
trap -- 'print "Trapped"' INT
$
$ Trapped                   # CTRL+C
$
$ Trapped                   # CTRL+\
$
$ trap - INT QUIT            # Back to default trapping
$
$ trap –p                    # No more special traps
$