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Linux基础|set 命令:写好shell脚本的“安全开关”

  • 2026-02-02 15:09:53
Linux基础|set 命令:写好shell脚本的“安全开关”

在编写 Shell 脚本时,很多隐蔽问题并非来自逻辑,而是执行行为失控。本文将带你系统了解 set 命令的核心用法,帮你写出更安全、更可靠的 Linux 脚本。

一、set 命令是干什么的?

简单来说:set 用来修改 shell 的行为模式。
它不会直接执行某个功能,而是控制:

    出错时是否退出

    变量未定义是否报错

    命令是否打印执行过程

    因此,set 更多出现在脚本开头,而不是交互式命令中。

    二、最常用的 set 参数

    1️⃣ set -e:出错就退出

    set -ecp file1 /tmp/rm not_exist_file echo "done" # 由于前面的错误,本行并不会输出
    一旦某条命令执行失败,脚本立即退出,后续命令不再执行。
    适合生产脚本,防止错误被“悄悄忽略”。

    2️⃣ set -u:未定义变量直接报错

    set -uecho $VAR # 这里会报错:VAR: parameter not set
    如果变量不存在,脚本会直接终止。
    可以避免拼写错误或环境变量缺失导致的隐性问题。

    3️⃣ set -x:打印执行过程(调试神器)

    set -xecho "hello"
    执行时会打印每一条实际运行的命令,非常适合排查问题。

    4️⃣ set -o pipefail:管道失败即失败

    set -o pipefailcat not_exist_file | grep "test"
    只要管道中有命令失败,整个管道就返回失败状态。
    这是很多新手容易忽略,但非常重要的安全设置。

    三、组合使用才是最佳实践

    在实际脚本中,最常见、最推荐的写法是:
    set -euo pipefail
    含义是:
    -e:出错退出
    -u:变量必须定义
    -o pipefail:管道失败可感知
    这几乎是严谨 Shell 脚本的标准开局

    四、一个简单示例对比

    没有 set 的脚本
    #!/bin/bashcp file1 /tmp/rm not_exist_fileecho "finish" # 本行会执行
    可能会在错误发生后继续执行,留下隐患。
    使用 set 的脚本
    #!/bin/bashset -euo pipefailcp file1 /tmp/rm not_exist_fileecho "finish" # 本行不会执行,由于上面的报错
    一旦出错,立即停止,行为可控。

    五、使用 set 的几点建议

    交互式终端谨慎使用 set -e
    生产脚本优先使用 set -euo pipefail
    调试阶段可临时打开 set -x

    六、写在最后

    set 命令不复杂,却极其重要。
    它不是让脚本“跑得更快”,而是让脚本更安全、更可预测。
    如果你开始写Shell脚本,或者维护线上任务,
    那么学会并用好 set,是你迈向成熟 Linux 使用者的重要一步。
    关注我,更多linux技巧和你一起探讨!

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    1. CONNECT:[ UseTime:0.000594s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000685s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002618s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000298s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000660s ]
    6. SELECT * FROM `set` [ RunTime:0.000401s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000535s ]
    8. SELECT * FROM `article` WHERE `id` = 461199 LIMIT 1 [ RunTime:0.023860s ]
    9. UPDATE `article` SET `lasttime` = 1770557056 WHERE `id` = 461199 [ RunTime:0.005210s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000309s ]
    11. SELECT * FROM `article` WHERE `id` < 461199 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000566s ]
    12. SELECT * FROM `article` WHERE `id` > 461199 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000527s ]
    13. SELECT * FROM `article` WHERE `id` < 461199 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004625s ]
    14. SELECT * FROM `article` WHERE `id` < 461199 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.013221s ]
    15. SELECT * FROM `article` WHERE `id` < 461199 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003383s ]
    0.132903s