可以获取上一条命令的exit code。 但是如果bash脚本中设置了set -e,那么如果命令的exit code不为0,当前bash脚本会直接退出。这种情况下如果要获取命令的exit code而不退出,需要让该命令在一个新的shell中执行: set -e ret=$(bash -c 'bash test2.sh; echo $?') echo $ret
echo “Command failed with exit code: $exit_code” fi “` 在这个例子中,我们使用了ls命令来示范。脚本首先执行ls命令,然后使用$?获取ls命令的返回值并将其赋值给变量exit_code。接下来,使用if语句判断exit_code的值,如果等于0,则打印”Command executed successfully”,否则打印”Command failed with exit code...
printf"\n"str2=""if[-n"$str2"];then echo'str2 is not empty'elseecho'str2 is empty'fi printf"\n"if["$str1"="$str2"];then echo'str1 = str2'elseecho'str1 <> str2'fi 注: -n即-not empty判断字符串非空,-z即-zero判断字符串为空,=判断字符串相同(判断字符串时,记得要加双引...
格式:trap "commands" EXIT 退出时执行commands指定的命令。( A trap on EXIT is executed before the shell terminates.) 退出码(exit status,或exit code)的约定: 0表示成功(Zero - Success) 非0表示失败(Non-Zero - Failure) 2表示用法不当(Incorrect Usage) 127表示命令没有找到(Command Not Found) 126...
exit ;; 2) echo "功能2已执行!" exit ;; 3) echo "功能3已执行!" exit ;; # 默认选项 4|"") echo "功能4已执行!" exit ;; esac 4、将指定输出内容写入文件 代码语言:javascript 代码运行次数:0 运行 AI代码解释 { echo "hahh" echo "lalal" } > /tmp/test 5、判断变量是否存在或为空...
Use the command “2>/dev/null” to send standard error outputs to /dev/null to suppress an error code. Also, when you combine the OR operation and the suppressed error output, a non-existing file or command can return as “0”. The OR operation (|| exit 0) provides a fallback, ou...
When you execute a command or run a script, you receive an exit code. An exit code is a system response that reports success, an error, or another condit...
Copy code node_modules/ 将.gitignore 文件提交到你的 Git 仓库。 如果node_modules 已经被提交到了你的仓库,你需要从仓库中移除它。可以使用以下命令: bash Copy code git rm -r --cached node_modulesgit commit -m "Remove node_modules from repository"git push ...
# 假设在终端输入 bash bash_tutorial.sh -a 1 -b 2 -c yes a=0; b=0; c="zero" # 变量初始化, 一行定义多个变量, 通过 ';' 分割开 # 定义函数提示正确用法 usage() { echo "Usage: bash $0 -a <a_meaning> -b <b_meaning> [-c <c_meaning>]" # '[ ]' 表示参数可选 exit 1 }...
use the newly-installed version if [ "${locally_resolved_nvm_version}" = 'N/A' ]; then nvm install "${nvm_version}"; elif [ "$(nvm current)" != "${locally_resolved_nvm_version}" ]; then nvm use "${nvm_version}"; fi fi } alias cd='cdnvm' cdnvm "$PWD" || exitThis...