| 1 | shopt
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| 2 | ===
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| 3 |
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| 4 | 显示和设置shell操作选项
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| 5 |
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| 6 | ## 补充说明
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| 7 |
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| 8 | **shopt命令** 用于显示和设置shell中的行为选项，通过这些选项以增强shell易用性。shopt命令若不带任何参数选项，则可以显示所有可以设置的shell操作选项。
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| 9 |
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| 10 | ### 语法
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| 11 |
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| 12 | ```shell
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| 13 | shopt(选项)(参数)
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| 14 | ```
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| 15 |
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| 16 | ### 选项
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| 17 |
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| 18 | ```shell
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| 19 | -s：激活指定的shell行为选项；
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| 20 | -u：关闭指定的shell行为选项。
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| 21 | ```
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| 22 |
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| 23 | ### 参数
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| 24 |
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| 25 | shell选项：指定要操作的shell选项。
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| 26 |
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| 27 | ### 实例
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| 28 |
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| 29 | 使用shopt命令显示当前所有可以设置的shell操作选项，输入如下命令：
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| 30 |
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| 31 | ```shell
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| 32 | shopt #输出所有可以设置的shell操作选项
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| 33 | autocd off
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| 34 | cdable_vars off
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| 35 | cdspell off
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| 36 | checkhash off
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| 37 | checkjobs off
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| 38 | checkwinsize on
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| 39 | cmdhist on
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| 40 | compat31 off
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| 41 | compat32 off
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| 42 | compat40 off
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| 43 | compat41 off
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| 44 | compat42 off
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| 45 | compat43 off
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| 46 | complete_fullquote on
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| 47 | direxpand off
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| 48 | dirspell off
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| 49 | dotglob off
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| 50 | execfail off
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| 51 | expand_aliases on
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| 52 | extdebug off
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| 53 | extglob off
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| 54 | extquote on
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| 55 | failglob off
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| 56 | force_fignore on
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| 57 | globasciiranges off
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| 58 | globstar off
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| 59 | gnu_errfmt off
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| 60 | histappend on
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| 61 | histreedit off
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| 62 | histverify off
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| 63 | hostcomplete on
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| 64 | huponexit off
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| 65 | inherit_errexit off
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| 66 | interactive_comments on
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| 67 | lastpipe off
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| 68 | lithist off
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| 69 | login_shell on
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| 70 | mailwarn off
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| 71 | no_empty_cmd_completion off
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| 72 | nocaseglob off
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| 73 | nocasematch off
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| 74 | nullglob off
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| 75 | progcomp on
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| 76 | promptvars on
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| 77 | restricted_shell off
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| 78 | shift_verbose off
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| 79 | sourcepath on
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| 80 | syslog_history off
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| 81 | xpg_echo off
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| 82 | ```
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| 83 |
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| 84 | 如图上所示，选项"cdspell"的状态为"off"，即关闭cd拼写检查选项。现在，可以使用shopt命令将其开启，输入如下命令：
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| 85 |
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| 86 | ```shell
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| 87 | shopt -s cdspell #开启cd拼写检查
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| 88 | ```
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| 89 |
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| 90 | 执行上面的命令后，该选项的状态将变为"on"，即开启状态。可以再次通过该命令显示一下shell操作选项即可，输出信息如下：
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| 91 |
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| 92 | ```shell
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| 93 | cdspell on #开启cdspell选项
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| 94 | ```
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| 95 |
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| 96 | 用户可以通过实际执行cd命令检查该选项是否被成功开启。
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| 98 |
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