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“set -eu”在 bash 脚本中起什么作用？

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“set -eu”在 bash 脚本中起什么作用？

我已经在 Google 上搜索过，但没有找到对这种组合的解释。

set -eubash shell 脚本启动时做什么？

（我可以找到一些解释，-e但没有-eu。）

答案1

在里面bash 手册页根据shell 内置命令该set命令已解释。-e和-u可以单独设置，但在调试时通常与-xtoset -eux或在 shebang 中组合使用#!/bin/bash -eux

-e      Exit  immediately  if  a  pipeline  (which  may  consist of a single simple
        command), a list, or a compound command (see SHELL  GRAMMAR  above),  exits
        with  a non-zero status.  The shell does not exit if the command that fails
        is part of the command list immediately following a while or until keyword,
        part  of  the  test  following  the  if or elif reserved words, part of any
        command executed in a && or || list except the command following the  final
        &&  or  ||,  any  command  in  a pipeline but the last, or if the command's
        return value is being inverted with !.  If a compound command other than  a
        subshell  returns  a  non-zero status because a command failed while -e was
        being ignored, the shell does not exit.  A trap on ERR, if set, is executed
        before  the  shell exits.  This option applies to the shell environment and
        each subshell environment separately  (see  COMMAND  EXECUTION  ENVIRONMENT
        above),  and  may cause subshells to exit before executing all the commands
        in the subshell.


-u      Treat  unset variables and parameters other than the special parameters "@"
        and "*" as an error when performing parameter expansion.  If  expansion  is
        attempted  on  an  unset  variable  or parameter, the shell prints an error
        message, and, if not interactive, exits with a non-zero status.

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