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Linux Shell 常用内置命令速查

  • 2026-07-02 16:26:32
Linux Shell 常用内置命令速查

日常写Shell脚本或者敲命令,常用内置命令整理,这些命令不用创建子进程,比外部命令快,按真实场景分好用。

变量操作

export是给子进程传环境变量的,子shell能继承,反过来不行。

# 把当前变量导出为环境变量,子进程能用
export JAVA_HOME=/usr/lib/jvm/java-11-openjdk
# 不带参数查看所有已导出的环境变量
export

子shell改了导出的变量,父shell不会变;如果要在当前shell生效并传给下一个,直接export就行,不用先赋值再export。

readonly把变量设为只读,防止误改,脚本里常用存固定配置。

# 把变量设为只读
readonly MAX_COUNT=10
# 查看所有只读变量
readonly

只读变量不能unset,不能改值。

set/env/unset配合用,区分不同范围的变量。

# set显示所有shell变量(包括未导出的)和函数
set
# env只显示环境变量
env
# 取消设置变量,不管是shell变量还是环境变量
unset MAX_COUNT

export、env、set设的变量都能用unset清,但只读的不行。

输入与执行控制

echo除了普通输出,还常用来查看上一条命令的退出码。

# 普通输出字符串,加引号防空格和特殊字符
echo "hello shell"
# 输出上一条命令的退出码,0成功非0失败
echo $?

不加引号的话,多个空格会被合并成一个。

read从标准输入读内容给变量,加-p有提示更友好。

# 带提示读一行
read -p "请输入用户名:" USERNAME
echo "你输入的是:$USERNAME"

一次读多个变量,空格分隔输入就行。

eval执行拼接好的命令,或者动态生成变量名,别随便用用户输入的内容,容易有安全风险。

# 执行变量里存的命令
CMD="ls -alh"
eval $CMD
# 动态生成变量名并赋值
KEY="NAME"
VALUE="zhangsan"
eval "$KEY=$VALUE"
echo $NAME

exec替换当前shell进程为指定命令,执行完后当前shell直接退出,脚本里后面的代码不会跑。

# 替换当前shell为ls,执行完ls就退出
exec ls -alh
脚本内部流程

exit退出当前脚本,指定返回码,父进程能通过$?拿到结果。

# 成功退出
exit 0
# 出错退出,返回1
exit 1

shift处理脚本的多个位置参数,每次左移一位,$#减1。

# 循环处理传入的所有文件
while [ $# -gt 0 ]; do
    echo "处理文件:$1"
    shift
done

加数字比如shift 2,就是左移两位。

点命令(.)和source一样,在当前shell执行脚本,不是子进程,所以脚本里的变量当前shell能用。

# 执行config.sh,里面的变量当前shell可用
. ./config.sh
# 或者用source
source ./config.sh
后台任务相关

wait等待所有后台任务结束,返回值总是0;也可以加PID等特定进程。

# 启动两个后台任务
sleep 10 &
sleep 5 &
echo "等待后台任务完成..."
wait
echo "所有后台任务都完成了"

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  1. CONNECT:[ UseTime:0.000389s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000715s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005432s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000367s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000630s ]
  6. SELECT * FROM `set` [ RunTime:0.000495s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000583s ]
  8. SELECT * FROM `article` WHERE `id` = 502811 LIMIT 1 [ RunTime:0.012075s ]
  9. UPDATE `article` SET `lasttime` = 1783006206 WHERE `id` = 502811 [ RunTime:0.034609s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.005571s ]
  11. SELECT * FROM `article` WHERE `id` < 502811 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001031s ]
  12. SELECT * FROM `article` WHERE `id` > 502811 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000430s ]
  13. SELECT * FROM `article` WHERE `id` < 502811 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003218s ]
  14. SELECT * FROM `article` WHERE `id` < 502811 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004873s ]
  15. SELECT * FROM `article` WHERE `id` < 502811 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.031838s ]
0.187894s