multiple bash traps for the same signal

Question

When I use the trap command in bash, the previous trap for the given signal is replaced.

Is there a way of making more than one trap<

Answer 1

I add a slightly more robust version of Laurent Simon's trap-add script:

• Allows using arbitrary commands as trap, including such with ' characters
• Works only in bash; It could be rewritten with sed instead of bash pattern substitution, but that would make it significantly slower.
• Still suffers from causing unwanted inheritance of the traps in subshells.

trap-add () {
    local handler=$(trap -p "$2")
    handler=${handler/trap -- \'/}    # /- Strip `trap '...' SIGNAL` -> ...
    handler=${handler%\'*}            # \-
    handler=${handler//\'\\\'\'/\'}   # <- Unquote quoted quotes ('\'')
    trap "${handler} $1;" "$2"
}