249 Ready-to-Use Shell Scripts to Boost Your Linux Ops Skills

As a Linux operations engineer, writing good scripts can improve work efficiency and free up time for other activities.

This article shares a collection of 249 ready‑to‑use shell script cases, encouraging readers to study, practice, and master scripting.

The 249 scripts span 147 pages, with a clear directory, searchable indexing, and copy‑ready code, making the electronic version ideal for learning, skill enhancement, and interview preparation.

1. Create Linux system account and password using positional parameters

#!/bin/bash
# 通过位置变量创建 Linux 系统账户及密码
#$1 是执行脚本的第一个参数,$2 是执行脚本的第二个参数
useradd "$1"
echo "$2" | passwd --stdin "$1"

2. Backup logs weekly

#!/bin/bash
# 每周 5 使用 tar 命令备份/var/log 下的所有日志文件
# vim  /root/logbak.sh
# 编写备份脚本,备份后的文件名包含日期标签,防止后面的备份将前面的备份数据覆盖
# 注意 date 命令需要使用反引号括起来,反引号在键盘<tab>键上面
tar -czf log-`date +%Y%m%d`.tar.gz /var/log

# crontab ‑e  #编写计划任务,执行备份脚本
00 03 * * 5 /root/logbak.sh

3. Input three numbers and sort them in ascending order

#!/bin/bash
# 依次提示用户输入 3 个整数,脚本根据数字大小依次排序输出 3 个数字
read -p "请输入一个整数:" num1
read -p "请输入一个整数:" num2
read -p "请输入一个整数:" num3
# 确保 num1 为最小值
if [ $num1 -gt $num2 ]; then
  tmp=$num1
  num1=$num2
  num2=$tmp
fi
if [ $num1 -gt $num3 ]; then
  tmp=$num1
  num1=$num3
  num3=$tmp
fi
# 确保 num2 为中间值
if [ $num2 -gt $num3 ]; then
  tmp=$num2
  num2=$num3
  num3=$tmp
fi
echo "排序后数据(从小到大)为:$num1,$num2,$num3"

4. Random name picker script

#!/bin/bash
# 编写一个点名器脚本
# 该脚本,需要提前准备一个 user.txt 文件
# 该文件中需要包含所有姓名的信息,一行一个姓名,脚本每次随机显示一个姓名
while :
do
  line=$(cat user.txt | wc -l)
  num=$[RANDOM%line+1]
  sed -n "${num}p" user.txt
  sleep 0.2
  clear
done

5. Sum of all positive integers up to 100

#!/bin/bash
# 对 100 以内的所有正整数相加求和(1+2+3+...+100)
sum=0
for i in `seq 100`
do
  sum=$[sum+i]
done
echo "总和是:$sum"

6. Count login‑capable accounts on the current Linux system

#!/bin/bash
# 统计当前 Linux 系统中可以登录计算机的账户有多少个
#方法 1:
grep "bash$" /etc/passwd | wc -l
#方法 2:
awk -F: '/bash$/{x++}END{print x}' /etc/passwd

7. Print various date and time formats

#!/bin/bash
# 打印各种时间格式

echo "显示星期简称(如:Sun)"
date +%a
echo "显示星期全称(如:Sunday)"
date +%A
echo "显示月份简称(如:Jan)"
date +%b
echo "显示月份全称(如:January)"
date +%B
echo "显示数字月份(如:12)"
date +%m
echo "显示数字日期(如:01)"
date +%d
echo "显示数字年(如:2023)"
date +%Y
echo "显示年‑月‑日"
date +%F
echo "显示小时(24 小时制)"
date +%H
echo "显示分钟(00..59)"
date +%M
echo "显示秒"
date +%S
echo "显示纳秒"
date +%N
echo "组合显示"
date +"%Y%m%d %H:%M:%S"