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return [ n ]
Causes a shell function or `.' script to return to the invoking
script with the return status specified by an arithmetic expres-
sion n. For example, the following prints `42':
() { integer foo=40; return "foo + 2" }
echo $?
If n is omitted, the return status is that of the last command
executed.
If return was executed from a trap in a TRAPNAL function, the
effect is different for zero and non-zero return status. With
zero status (or after an implicit return at the end of the
trap), the shell will return to whatever it was previously pro-
cessing; with a non-zero status, the shell will behave as inter-
rupted except that the return status of the trap is retained.
Note that the numeric value of the signal which caused the trap
is passed as the first argument, so the statement `return
"128+$1"' will return the same status as if the signal had not
been trapped.
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