Shell 字符串常见操作

参考文章:http://blog.csdn.net/chen_jp/article/details/8922582

一 字符替换

origin=原字符串  str=替换后的字符串

替换命令:

str=${origin//目标字符/替换后的字符}

例如:

str=${origin//:/_}

代码示例:

origin='mark:x:0:0:this is a test user:/var/mark:nologin'
str=${origin//:/_}
echo ${origin}
echo ${str}

输出:

mark:x:::this is a test user:/var/mark:nologin
mark_x_0_0_this is a test user_/var/mark_nologin

二 字符串分割

origin='mark:x:0:0:this is a test user:/var/mark:nologin'
i=
while((==))
do
        split=`echo $origin|cut -d ":" -f$i`
        if [ "$split" != "" ]
        then
                ((i++))
                echo $split
        else
                break
        fi
done

输出:

mark
x

this is a test user
/var/mark
nologin