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Linux shell 中的那些小把戏

  • 2026-01-31 02:10:02
Linux shell 中的那些小把戏

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英文:Techbar,翻译:Linux中国/geekpi

linux.cn/article-2389-1.html

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我日常使用Linux shell(Bash),但是我经常忘记一些有用的命令或者shell技巧。是的,我能记住一些命令,但是肯定不会只在特定的任务上使用一次,所以我就开始在我的Dropbox账号里用文本文件写下这些Linux shell的小技巧,现在我决定共享它给你。这个表我以后还会更新。记住,这里的一些贴士需要在你的Linux发行版上安装额外的软件。

在bash中检查远程端口是否打开:

echo >/dev/tcp/8.8.8.8/53 && echo "open"

将进程挂起:

Ctrl + z 

将进程移到前台:

fg

(译注,挂起的进程是不执行的,如果希望在后台执行,可以使用bg命令,并且指定通过jobs命令获得的任务号。)

生成随机16进制数字,n是字符的数量:

openssl rand -hex n

在当前shell中执行一个文件中的命令(译注:这个文件不是一个bash脚本,比如.bashrc、bash_profile等):

source /home/user/file.name

提取字符串的前5个字符:

${variable:0:5}

打开SSH调试模式(译注:当你遇到SSH连接问题时很有用):

ssh -vvv user@ip_address

使用pem key的进行SSH连接:

ssh user@ip_address -i key.pem

用wget获取完整目录列表到本地目录:

wget -r --no-parent --reject "index.html*" http://hostname/ -P /home/user/dirs

同时创建多个目录:

mkdir -p /home/user/{test,test1,test2}

以树状列出进程及子进程:

ps axwef

创建war文件:

jar -cvf name.war file

测试磁盘写速度:

dd if=/dev/zero of=/tmp/output.img bs=8k count=256k conv=fdatasync; rm -rf /tmp/output.img

测试磁盘读速度:

hdparm -Tt /dev/sda

获取文本的md5值:

echo -n "text" | md5sum

检测xml语法:

xmllint --noout file.xml

将tar.gz文件解压到指定目录:

tar zxvf package.tar.gz -C new_dir

用curl获取HTTP头:

curl -I http://www.example.com

修改一些文件或目录的时间戳 (格式为:YYMMDDhhmm):

touch -t 0712250000 file

使用wget从ftp下载:

wget -m ftp://username:password@hostname

生成随机密码 (本例中16位字符长):

LANG=c < /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-16};echo;

快速创建一个文件的备份(扩展名是.bkp):

cp some_file_name{,.bkp}

访问Windows共享:

smbclient -U "DOMAINuser" //dc.domain.com/share/test/dir

运行history中的命令 (这里在history中的第100个):

!100

unzip到目录中:

unzip package_name.zip -d dir_name

输入多行文字 (按 CTRL + d 退出):

cat > test.txt

创建空白的文件或者清空已存在的文件:

> test.txt

从Ubuntu NTP服务器上更新日期:

ntpdate ntp.ubuntu.com

netstat 显示所有IPv4的TCP监听的端口:

netstat -lnt4 | awk '{print $4}' | cut -f2 -d: | grep -o '[0-9]*'

将qcow2的镜像转化成raw格式:

qemu-img convert -fqcow2 -Oraw precise-server-cloudimg-amd64-disk1.img\

precise-server-cloudimg-amd64-disk1.raw

重复运行命令并显示它的输出 (默认2秒重复一次):

watch ps -ef

显示所有用户:

getent passwd

以读写模式挂载根文件系统:

mount -o remount,rw /

挂载目录 (适合于符号链接不能工作的情况下):

mount --bind /source /destination

发送DNS动态更新给DNS:

nsupdate <

递归grep所有目录

grep -r "some_text" /path/to/dir

列出10个最大的系统中已打开的文件:

lsof / | awk '{ if($7 > 1048576) print $7/1048576 "MB "$9 }' | sort -n -u | tail

以MB显示空余内存:

free -m | grep cache | awk '/[0-9]/{ print $4" MB" }'

打开vim并跳转到文件最后:

vim + some_file_name

git clone特定branch (本例是master分支):

git clone git@github.com:name/app.git -b master

git切换到另外一个branch (本例是develop分支):

git checkout develop

git删除一个branch(本例是myfeature):

git branch -d myfeature

Git删除一个远程branch:

git push origin :branchName

Git push 新的branch到远程:

git push -u origin mynewfeature

打印history中最后的cat命令

!cat:p

运行history中的最后的cat命令:

!cat

找出在/home/user中的所有空子目录:

find /home/user -maxdepth 1 -type d -empty

得到test.txt中50到60行的文本:

< test.txt sed -n '50,60p'

以sudo权限重新运行上一个执行的命令 (如果是: mkdir /root/test, 下面会运行: sudo mkdir /root/test)(译注:当你执行一个命令忘记sudo时,可以这样重新执行,而不必再把完整命令敲一遍):

sudo !!

创建临时RAM文件系统 – ramdisk (请先创建 /tmpram 目录):

mount -t tmpfs tmpfs /tmpram -o size=512m

Grep完整的单词(译注:而不是其它单词的一部分):

grep -w "name" test.txt

提升权限后在一个文件后追加文本:

echo "some text" | sudo tee -a /path/file

列出所有支持的kill信号:

kill -l

生成随机密码 (本例中16个字符长):

openssl rand -base64 16

在bash历史中不记录最后的会话:

kill -9 $$

扫描网络来找出开放的端口:

nmap -p 8081 172.20.0.0/16

设置git email:

git config --global user.email "me@example.com"

如果你有未提交的commit,与master同步:

git pull --rebase origin master

将文件名中含有txt的所有文件移动到/home/user:

find -iname "*txt*" -exec mv -v {} /home/user \;

按行将两个文件中的对应行合并显示:

paste test.txt test1.txt

shell中的进度条:

pv data.log

用netcat发送数据给服务器:

echo "hosts.sampleHost 10 `date +%s`" | nc 192.168.200.2 3000

转换tab为空格:

expand test.txt > test1.txt

跳过bash历史:

<<空格>>cmd

回到之前的工作目录:

cd -

切割大的tar.gz文件为几个文件 (每个100MB),并还原:

splitb100m /path/to/large/archive /path/to/output/files

cat files* > archive

用curl获取HTTP状态值:

curl -sL -w "%{http_code}\n" www.example.com -o /dev/null

当 Ctrl + c 没用时:

Ctrl + \

获取文件所有者:

stat -c %U file.txt

列出块设备:

lsblk -f

找出文件中带有末尾空格的文件:

find . -type f -exec egrep -l " +$" "{}" \;

找出用tab缩进的文件:

find . -type f -exec egrep -l $'t' "{}" \;

用”=”打印水平行

printf '%100sn' | tr ' ' =

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  1. CONNECT:[ UseTime:0.001162s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001437s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004444s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.010318s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001450s ]
  6. SELECT * FROM `set` [ RunTime:0.003514s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001707s ]
  8. SELECT * FROM `article` WHERE `id` = 463431 LIMIT 1 [ RunTime:0.005667s ]
  9. UPDATE `article` SET `lasttime` = 1770535520 WHERE `id` = 463431 [ RunTime:0.005214s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.001113s ]
  11. SELECT * FROM `article` WHERE `id` < 463431 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005657s ]
  12. SELECT * FROM `article` WHERE `id` > 463431 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008448s ]
  13. SELECT * FROM `article` WHERE `id` < 463431 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.015513s ]
  14. SELECT * FROM `article` WHERE `id` < 463431 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.023337s ]
  15. SELECT * FROM `article` WHERE `id` < 463431 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.029551s ]
0.285063s