trap scope

trapscope.bash

#!/usr/bin/env bash

# bash: line 3: declare: v: readonly variable
for fd in {a..d}; do
    echo "$fd"
    bash -x /dev/fd/"${!fd}"
done {ofd}<&0 <<\EOFA {a}<&0 <<\EOFB {b}<&0 <<\EOFC {c}<&0 <<\EOFD {d}<&0 <&${ofd}

tt() { typeset -r v=; }
t() { tt; }
ff() {
    typeset -r v=
    exit
}
f() { ff; }

trap t EXIT
f
EOFA

tt() { typeset -r v=; }
t() { tt; }
ff() {
    typeset -r v=
    exit
}
f() { ff; }

trap t EXIT;
f
EOFB

tt() { typeset -r v=; }
t() { tt; }
ff() {
    typeset -r v=
    exit
}

trap t EXIT;
ff
EOFC

tt() { typeset -r v=; }
ff() {
    typeset -r v=
    exit
}
f() { ff; }
trap tt EXIT;
f
EOFD

# vim: set fenc=utf-8 ff=unix ts=4 sts=4 sw=4 ft=sh nowrap et: