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Linux命令25、echo

  • 2026-07-02 02:51:36
Linux命令25、echo
echo主要用于在终端显示文本信息、输出变量值、生成格式化字符串、向文件追加内容。
语法
echo [选项] [字符串] 
参数
-n--不输出换行符
-e--启用转义字符解释
-E--禁用转义字符解释
转义字符，配合-e选项：
\n--换行
\t--制表符
\r--回车
\b--退格
\\--反斜杠
\"--双引号
\a--响铃
实例
输出字符串
输出变量
禁用换行
使用转义字符
输出彩色文本(\033[31m红色、033[32m绿色、\033[0m重置颜色)
输出到文件（>覆盖,>>追加）
注意事项
echo后文本加双引号会解释变量和转义字符，单引号直接输出，无引号会压缩空格。大量输出时，echo比cat效率高，避免在循环中用echo创建大文件。
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  1. 请求信息 : 2026-07-03 02:30:10 HTTP/2.0 GET : https://f.mffb.com.cn/a/497384.html
  2. 运行时间 : 0.389631s [ 吞吐率：2.57req/s ] 内存消耗：4,761.59kb 文件加载：140
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=2a3027f73c36f7a96e50725c407c8971
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  1. CONNECT:[ UseTime:0.000505s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000720s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001139s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002855s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000561s ]
  6. SELECT * FROM `set` [ RunTime:0.005288s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000585s ]
  8. SELECT * FROM `article` WHERE `id` = 497384 LIMIT 1 [ RunTime:0.011121s ]
  9. UPDATE `article` SET `lasttime` = 1783017011 WHERE `id` = 497384 [ RunTime:0.011463s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.009889s ]
  11. SELECT * FROM `article` WHERE `id` < 497384 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.019575s ]
  12. SELECT * FROM `article` WHERE `id` > 497384 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008098s ]
  13. SELECT * FROM `article` WHERE `id` < 497384 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.090015s ]
  14. SELECT * FROM `article` WHERE `id` < 497384 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.033747s ]
  15. SELECT * FROM `article` WHERE `id` < 497384 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.093203s ]
0.393526s