___
___
___
trap -- 'a' EXIT
trap -- 'a' INT
trap -- 'a' USR1
trap -- 'a' USR2
___
trap -- 'a' EXIT trap -- 'a' INT trap -- 'a' USR1 trap -- 'a' USR2
___
trap -- 'a' EXIT
trap -- 'a' INT
trap -- 'a' USR1
trap -- 'a' USR2
___
trap -- 'a' EXIT
trap -- 'a' INT
trap -- 'a' USR1
trap -- 'a' USR2
___
___
trap -- 'a' USR1
trap -- 'a' USR2
___
___
trap -- 'a' USR2