1.定义变量时, =号的两边不可以留空格.
eg:
gender=femal————right
gender =femal———–wrong
gender= femal———–wrong
2.条件测试语句 [ 符号的两边都要留空格.
eg:
if [ $gender = femal ]; then——-right.
echo “you are femal”;
fi
if[ $gender…———————–wrong
if [$gender…———————-wrong.
3.条件测试的内容,如果是字符串比较的话, 比较符号两边要留空格!
eg:
if [ $gender = femal ]; t
