export PATH=$PATH:/path/to/command_directory 要永久添加,可以将上述命令添加到您的~/.bashrc或~/.bash_profile文件中。 检查文件权限 确保命令文件具有执行权限: 代码语言:txt 复制 ls -l /path/to/command 如果没有执行权限,可以使用chmod命令添加: 代码语言:txt 复制 chmod +x /path/to/command 检查别名...
$ unset x $ showvar $x is not set $ x=3 $ showvar $x is not set $ export x $ showvar $x = 3 $ x= ## in bash, reassignment doesn't remove a variable from the environment $ showvar $x is set but empty 注意 showvar不是一个 bash 命令,而是一个如清单 5-1 所示的脚本,...
tion,declareandtypeset makeeachname local,aswiththe local command, unless the -goptionissup‐ plied.Ifa variable nameisfollowedby=value, the valueofthe variableissettovalue.Whenus‐ ing -aor-Aandthe compound assignment syntaxtocreate array variables, additional attributesdonottakeeffectuntilsubsequent...
这就意味着比如创建关联,添加一个新目录到$PATH,或者修改一个 shell 提示符。 你可能已经浏览过其他的教程,他们告诉你把你的配置放在.bashrc,.bash_profile或者其他的配置文件,这些配置文件被 Bash shell 读取和执行。 在本文中,我们将要讨论 Bash 启动文件,和.bashrc,.bash_profile两个文件之间的不同。 一、交互...
for i in `seq 1 10`; do echo $i; done 这里我想强调的是，通过反引号（即键盘上Tab键上方的按键，注意不是单引号）将 seq 命令的输出结果，嵌入了 for 循环中直接使用。通过类似这种命令替换的方式，我们可以大大减少代码冗余，同时减少代码的出错几率。常见的替换方式有如下两种：OUTPUT=`command`# or OUT...
set -u #Assign value to a variable strvar="Bash Programming" printf "\n$strvar $intvar\n" The following output appears after executing the previous script. Here, the error is printed for the uninitialized variable: Example 6: Using the Set Command with -f Option ...
不会执行单词拆分和文件名扩展。赋值语句也可以作为alias、declare、typeset、export、readonly和local内置命令(声明命令)的参数出现。当处于POSIX 模式下(详见 "6.11 Bash POSIX 模式"),这些内置命令可以在一个命令中跟在一个或多个command内置命令实例之后,并保留这些赋值语句特性。
command, not just those that precede thecommandname.-mJob control is enabled.-nRead commands butdonot execute them.-ooption-name Set the variable corresponding to option-name: allexport same as-abraceexpand same as-Bemacs use an emacs-style line editing interface ...
# for setting history length see HISTSIZE and HISTFILESIZE in bash(1) HISTSIZE=1000 HISTFILESIZE=2000 # check the window size after each command and, if necessary, # update the values of LINES and COLUMNS. shopt -s checkwinsize # If set, the pattern "**" used in a pathname expansion...
While ShellCheck is mostly intended for interactive use, it can easily be added to builds or test suites. It makes canonical use of exit codes, so you can just add ashellcheckcommand as part of the process. For example, in a Makefile: ...