busybox-1.19.3/shell/hush_test/hush-trap/usage.tests

# no output -- default state
echo ___
trap

# assign some traps
echo ___
trap "a" EXIT INT USR1 USR2

# show them all
echo ___
trap

# clear one
echo ___
trap 0 INT
echo ___
trap

# clear another
echo ___
trap "-" USR1
echo ___
trap