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Linux每日命令-08-cat

  • 2026-01-24 21:28:55
Linux每日命令-08-cat

Linux每日一篇 - 08 - cat

Linux文件查看神器!掌握cat命令,轻松查看和合并文件内容,让文本操作变得简单高效!

cat命令是什么?

cat是"Concatenate"的缩写,用于查看文件内容、创建文件、合并文件,是Linux中最常用的文本操作命令之一。

基本用法

# 查看文件内容cat filename# 查看多个文件内容cat file1 file2 file3# 创建新文件并输入内容cat > newfile.txt# 追加内容到文件cat >> existing_file.txt# 显示行号cat -n filename# 显示非空白行号cat -b filename# 显示所有字符(包括不可见字符)cat -A filename

实用技巧

# 合并多个文件cat file1.txt file2.txt > combined.txt# 显示文件内容并编号cat -n /etc/passwd# 显示文件内容并压缩空白行cat -s filename# 显示制表符为^Icat -T filename# 查看文件并清屏clear && cat filename# 使用here document创建多行文件cat > script.sh << EOF#!/bin/bashecho "Hello World"EOF# 临时查看文件而不分页cat /var/log/syslog | head -20

常用场景

# 查看配置文件cat /etc/hosts# 查看日志文件cat /var/log/messages# 创建简单的配置文件cat > /tmp/myconfig.conf << EOFoption1=value1option2=value2EOF# 合并分割的文件cat part1 part2 part3 > complete_file# 备份配置文件并添加时间戳cat /etc/ssh/sshd_config > /tmp/sshd_config_$(date +%Y%m%d)# 查看脚本内容cat ~/.bashrc

关于我

•文章来源博客:https://blog.echospace.top/cat[1]

•全平台同名"汪多多是只猫",专注分享实用技术教程,让你的IT学习之!欢迎在评论区留下属于你的看法,也欢迎讨论你在使用Linux时所遇到的问题。我是汪多多它爹,一个失业的运维工程师,我们下期再见。

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  1. 请求信息 : 2026-02-08 07:40:40 HTTP/2.0 GET : https://f.mffb.com.cn/a/464924.html
  2. 运行时间 : 0.144021s [ 吞吐率:6.94req/s ] 内存消耗:4,613.41kb 文件加载:140
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=0199b9c9a413865ed46c1e3debc51182
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  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000611s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000729s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000865s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000276s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000585s ]
  6. SELECT * FROM `set` [ RunTime:0.004996s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000752s ]
  8. SELECT * FROM `article` WHERE `id` = 464924 LIMIT 1 [ RunTime:0.005626s ]
  9. UPDATE `article` SET `lasttime` = 1770507640 WHERE `id` = 464924 [ RunTime:0.001503s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.004771s ]
  11. SELECT * FROM `article` WHERE `id` < 464924 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004191s ]
  12. SELECT * FROM `article` WHERE `id` > 464924 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003706s ]
  13. SELECT * FROM `article` WHERE `id` < 464924 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.016872s ]
  14. SELECT * FROM `article` WHERE `id` < 464924 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011393s ]
  15. SELECT * FROM `article` WHERE `id` < 464924 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006911s ]
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