set-e-test   [plain text]

if : ; then
	set -e
	N=95
	while :; do
		# expr returns 1 if expression is null or 0
		set +e
		N_MOD_100=`expr $N % 100`
		set -e
		echo $N_MOD_100
		N=`expr $N + 1`
		if [ $N -eq 110 ]; then
			break
		fi
	done
	set +e
fi

(
set -e
false
echo bad
)
echo $?

x=$(
set -e
false
echo bad
)
echo $? $x

# command subst should not inherit -e
set -e
echo $(false; echo ok)

if set +e
then
	false
fi
echo hi

set -e

# a failing command in the compound list following a while, until, or
# if should not cause the shell to exit

while false; do
	echo hi
done
echo while succeeded

x=1
until (( x == 4 )); do
	x=4
done
echo until succeeded: $x

if false; then
	echo oops
fi
echo if succeeded

# failing commands that are part of an AND or OR list should not
# cause the shell to exit
false && echo AND list failed
echo AND list succeeded

false || echo OR list succeeded

! false
echo ! succeeded

# make sure eval preserves the state of the -e flag and `!' reserved word
set -e
if eval false; then
	echo oops
fi
echo eval succeeded

! eval false
echo ! eval succeeded -- 1

! eval '(exit 5)'
echo ! eval succeeded -- 2