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trap 'echo USR1 $BASHPID' USR1
trap 'echo foo $BASH_SUBSHELL' 0
trap | cat
echo between
( trap )
echo between 2
{ trap; } | cat
( echo in subshell: $BASH_SUBSHELL )
( echo in subshell pipeline: $BASH_SUBSHELL ) | cat
{ echo group pipeline: $BASH_SUBSHELL;
trap 'echo EXIT-group.$BASH_SUBSHELL' EXIT; } | cat
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