expr-works

来自「busybox最新版的源码:学习和应用的好东东,多的不说了,大家看后再说吧」· 代码 · 共 60 行

# busybox expr
busybox expr 1 \| 1
busybox expr 1 \| 0
busybox expr 0 \| 1
busybox expr 1 \& 1
busybox expr 0 \< 1
busybox expr 1 \> 0
busybox expr 0 \<= 1
busybox expr 1 \<= 1
busybox expr 1 \>= 0
busybox expr 1 \>= 1
busybox expr 1 + 2
busybox expr 2 - 1
busybox expr 2 \* 3
busybox expr 12 / 2
busybox expr 12 % 5


set +e
busybox expr 0 \| 0
if [ $? != 1 ] ; then
	exit 1;
fi;

busybox expr 1 \& 0
if [ $? != 1 ] ; then
	exit 1;
fi;

busybox expr 0 \& 1
if [ $? != 1 ] ; then
	exit 1;
fi;

busybox expr 0 \& 0
if [ $? != 1 ] ; then
	exit 1;
fi;

busybox expr 1 \< 0
if [ $? != 1 ] ; then
	exit 1;
fi;

busybox expr 0 \> 1
if [ $? != 1 ] ; then
	exit 1;
fi;

busybox expr 1 \<= 0
if [ $? != 1 ] ; then
	exit 1;
fi;

busybox expr 0 \>= 1
if [ $? != 1 ] ; then
	exit 1;
fi;