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掌握这些命令,可以更高效地在 Linux 终端处理文件内容.

  • 2026-02-28 01:13:13
掌握这些命令,可以更高效地在 Linux 终端处理文件内容.

      在 Linux 系统中,查看文件内容是最常见的操作之一。下面的这些命令各有特点,适用于不同的场景。下面逐一介绍它们的功能和用法:

1. cat —— 连接并显示文件内容

· 用途:一次性输出整个文件到终端。适合查看内容较短的文件,也常用于合并多个文件(cat file1 file2 > newfile)或创建文件(cat > file)。

· 示例:cat /etc/passwd

· 常用选项:

  · -n:显示行号(包括空行)

  · -b:显示行号(仅对非空行编号)

2. tac —— 反向显示文件内容

· 用途:与 cat 相反,从最后一行开始显示文件内容(行序反转)。

· 示例:tac log.txt

3. nl —— 带行号显示文件

· 用途:输出文件内容并添加行号,功能类似 cat -b,但可自定义行号格式(如左对齐、右对齐、是否给空行编号)。

· 示例:nl script.sh

4. more —— 分页查看文件(仅向前翻页)

· 用途:当文件内容超出一屏时,more 会分页显示,按 空格键 翻下一页,按 Enter 滚动一行,按 q 退出。不能向上翻页。

· 示例:more longfile.txt

5. less —— 更强大的分页查看工具

· 用途:比 more 更灵活,支持上下方向键翻页(或 PageUp/PageDown),可以搜索(输入 /关键词 后按 n/N 跳转),还支持跳转到文件开头(g)或末尾(G)。

· 示例:less /var/log/syslog

6. head —— 显示文件开头部分

· 用途:默认显示文件前 10 行,可用 -n 指定行数。

· 示例:head -n 20 data.csv(显示前 20 行)

7. tail —— 显示文件结尾部分

· 用途:默认显示文件最后 10 行,常用 -n 指定行数。

· 特色:tail -f 可以实时跟踪文件更新(如查看日志),按 Ctrl+C 停止。

· 示例:tail -f /var/log/nginx/access.log

8. wc —— 统计文件信息

· 用途:统计文件的行数(-l)、单词数(-w)、字节数(-c)等。

· 示例:wc -l file.txt(只显示行数)

总结:如何选择?

场景                              推荐命令

查看小文件内容                  cat

反向查看文件(如日志)     tac

需要行号查看代码/配置       nl 或 cat -n

查看大文件,只需向下翻页     more

查看大文件,需上下翻页/搜索 less

只看文件开头几行                  head

只看文件末尾几行或实时监控  tail

统计文件行数/单词数              wc

     掌握这些命令,可以更高效地在 Linux 终端处理文件内容。

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  1. CONNECT:[ UseTime:0.000450s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000750s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000287s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000248s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000511s ]
  6. SELECT * FROM `set` [ RunTime:0.000208s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000498s ]
  8. SELECT * FROM `article` WHERE `id` = 477189 LIMIT 1 [ RunTime:0.000340s ]
  9. UPDATE `article` SET `lasttime` = 1772298592 WHERE `id` = 477189 [ RunTime:0.000963s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000208s ]
  11. SELECT * FROM `article` WHERE `id` < 477189 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000383s ]
  12. SELECT * FROM `article` WHERE `id` > 477189 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000397s ]
  13. SELECT * FROM `article` WHERE `id` < 477189 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001410s ]
  14. SELECT * FROM `article` WHERE `id` < 477189 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000893s ]
  15. SELECT * FROM `article` WHERE `id` < 477189 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001548s ]
0.079993s