date last=$(echo `history |tail -n2 |head -n1` | sed 's/[0-9]* //') echo "last command is [$last]" case "1" in "1") date last=$(echo `history |tail -n2 |head -n1` | sed 's/[0-9]* //') echo "last command is [$last]" ;; esac 输出: Tue May 24 12:36:04...
(If n is omitted, the exit status is that of the last command executed. ) 格式:$? 上一个命令的退出码。 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...
$bash$exit256exit$echo$?0 If you use 257 as the exit code, your exit status is 1, and so on. If the exit code is a negative number, the resulting exit status is that number subtracted from 256. So, if your exit code is 20, then the exit status is 236. Troubling, isn't it?
echo ${PATH#/*/lib64/qt-3.3/bin:}#输出:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin echo ${PATH##/*:}#输出:/root/bin echo ${PATH%:*}#输出:/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin echo ${PATH%%:*}#输出:/usr/lib64/q...
使用trap命令。可以在bash脚本中添加以下代码,捕获程序错误并输出错误信息: 代码语言:txt 复制 trap 'echo "Error: $?"' ERR 这个命令会在脚本中出现错误时输出错误信息,包括错误代码和错误信息。 总之,检测bash脚本中的程序错误可以使用多种方法,包括使用shellcheck工具、bash内置的调试功能和trap命令等。相关搜索: ...
假设我有一个脚本a.ps1& cmd /c "exit 1" echo "cmd exited `$LastExitCode=$LastExitCode令我惊讶<e 浏览0提问于2012-07-12得票数 12 回答已采纳 1回答 如何在PowerShell中列出一个文件夹中的所有文件(做cmd的` `dir /A`)? 、、、 在cmd中,你可以运行C:\path> dir /A,它会列出一个文件...
echo "未知选项: -$OPTARG"exit 1;;esacdone# 处理其他参数shift $((OPTIND-1))echo "其他参数:$@" 在上面的示例中,getopts 函数用于解析选项,而shift 命令用于将已处理的选项从参数列表中移除,以便您可以处理剩余的参数。 因此,位置参数在Bash脚本中用于处理命令行参数,与您在终端中使用的命令的选项和参数...
echo "I am $age years old." Using a Prompt 4. Reading Multiple Variables: You can read multiple inputs into different variables in a single line. echo "Enter your first name and last name:" read first_name last_name echo "Hello, $first_name $last_name!" ...
VS Code version: Code - Insiders 1.71.0-insider (eebdf81, 2022-08-12T05:17:00.323Z) OS version: Windows_NT x64 10.0.19044 Modes: Sandboxed: Yes Remote OS version: Linux x64 4.15.0-169-generic When the original PROMPT_COMMAND is an array: exit code of last executed command is not ...
exit(1) # 结束程序,$? => 1 subprocess.run( # 创建用户 'useradd %s' % user, shell=True ) subprocess.run( # 添加密码 'echo %s | passwd --stdin %s' % (password, user), shell=True ) with open(fname,'a') as fobj: # 将用户名和密码写入文件 ...