1. 单行注释
众所周知，# 比如想要注释：echo “ni”
# echo "ni"
2. 多行注释
法一：
: << ! 语句1 语句2 语句3 语句4 !
例如：
linux101:/home/wsj # sh dian
ni
ni
ni
ni
ni
ni linux101:/home/wsj # more dian
#!/bin/ksh
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni" :<<!
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni"
!
法二：
: ' 语句1 语句2 语句3 语句4 '
例如：
linux101:/home/wsj # sh dian
ni
ni
ni
ni
ni
ni linux101:/home/wsj # more dian
#!/bin/ksh
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni" : '
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni"
'
法三：
if false; then 语句1 语句2 语句3 语句4 fi linux101:/home/wsj # sh dian
ni
ni
ni
ni
ni
ni linux101:/home/wsj # more dian
#!/bin/ksh
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni" if false; then
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni"
echo "ni"
fi
法四：
: << 字符 #这里的字符可以是数字或者是字符都可以 语句1 语句2 语句3 语句4 字符
法五：
(()) & {
语句1
语句2
语句3
}