Linux Shell经典面试题(其一)

Linux Shell经典面试题(其一)

参考：http://blog.csdn.net/hiyun9/article/details/52057255

1.使用for循环在/oldboy目录下通过随机小写10个字母加固定字符串oldboy批量创建10个html文件，名称例如为：

[root@oldboy oldboy]# sh /server/scripts/oldboy.sh  
[root@oldboy oldboy]# ls  
coaolvajcq_oldboy.html  qnvuxvicni_oldboy.html  vioesjmcbu_oldboy.html  
gmkhrancxh_oldboy.html  tmdjormaxr_oldboy.html  wzewnojiwe_oldboy.html  
jdxexendbe_oldboy.html  ugaywanjlm_oldboy.html  xzzruhdzda_oldboy.html  
qcawgsrtkp_oldboy.html  vfrphtqjpc_oldboy.html  

############批量创建html文件脚本编写##############

$ vim create-oldboy-html.sh

#!/bin/sh

WORK_DIR=/oldboy

create(){
    i=1
    while ($i<11)
    do
        cd $WORK_DIR && touch `"a-z" | head -c 10`_oldboy.html
        i = $($i+1)
    done
}


check(){
    if [ ! -d $WORK_DIR ]; then
        mkdir  $WORK_DIR
        create
    else
        create
    fi
}

check


// 将上述文件名中的oldboy全部改成oldgirl（用for循环实现），并且html改成大写【至少两种方法实现】

############批量修改html文件名脚本编写，方法一##############

$ vim edit-oldgirl-HTML-1.sh

#!/bin/bash

change_name(){
    DIR=/oldboy
    FILE=`ls /oldboy`
    GIRL=_oldgirl.HTML

    for i in $FILE
    do
        c=`echo $i | cut -c 1-10`
        mv $DIR/$c* $DIR/$c$GIRL
    done    
}

change_name


############批量修改html文件名脚本编写，方法二##############

$ vim edit-oldgirl-HTML-2.sh

#!/bin/bash

change_name(){
    DIR=/oldboy
    FILE=`ls /oldboy`
    GIRL=_oldgirl.HTML

    for i in $FILE
    do
        c=`echo $i | awk -F '_' '{print $1}'`
        mv $DIR/$c* $DIR/$c$GIRL
    done
}

change_name

2.批量创建10个系统账号oldboy01-oldboy10并设置密码(密码为随机8位字符串)。

######批量创建系统账号脚本编写

vim create_sys_account.sh

#!/bin/bash

USER=oldboy

create_user(){
    for i in {01..10}
    do
        RPASSWD=$(tr -dc [:alpha:] < /dev/urandom | head -c 8)
        useradd $USER$i
        echo $RPASSWD | passwd $USER$i --stdin
        echo $USER$i----$RPASSWD >> /oldboy/userpassword.txt
    done
}

del_user(){

    for j in {01..10}
    do
        userdel $USER$j
        rm -rf /home/$USER$j
    done
}

case $1 in
    create)
        create_user
    ;;
    del)
        del_user
    ;;
    *)
        echo "Usage:Please use $0 create or $0 del."
        echo "#######################"
        echo "create: create user $USER 01-10 and give it random passwd."
        echo "del: delete $USER 01-10 and /home/$USER 01-10 directory."
    ;;
esac

[root@cjy linux-20]# ./create_sys_account.sh  
Usage:Please use ./4.sh create or ./create_sys_account.sh del.  
####################################  
create: create user oldboy 01-10 and give it random passwd.  
del: delete oldboy 01-10 and /home/oldboy 01-10 directory.  

[root@cjy linux-20]# ./create_sys_account.sh create  
正在创建信箱文件: 文件已存在