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(If n is omitted, the exit status is that of the last command executed. ) 格式:$? 上一个命令的退出码。 格式:trap "commands" EXIT 退出时执行commands指定的命令。( A trap on EXIT is executed before the shell terminates.) 退出码(exit status,或exit code)的约定: 0表示成功(Zero - Success...
function looooooooong { START=$(date +%s.%N) $* EXIT_CODE=$? END=$(date +%s.%N) DIFF=$(echo "$END - $START" | bc) RES=$(python -c "diff = $DIFF; min = int(diff / 60); print('%s min' % min)") result="$1 completed in $RES, exit code $EXIT_CODE." echo -e "...
When you execute a command or run a script, you receive anexit code. An exit code is a system response that reports success, an error, or another condition that provides a clue about what caused an unexpected result from your command or script. Yet, you might never know about the code,...
bash 和 zsh 命令行终端都非常流行,后者尤为“精妙”。这两个终端的关键命令很相似,而对于经常使用它们的人来说,了解这些省时省力的快捷键命令 -- 大部分是用来对当前命令行进行快速导航或编辑的,将会事半功倍。 要移动到当前行的开头,使用 [Ctrl][A] ...
准备工作 手机已经root adb.exe 已经放到了系统环境变量，也就是打开cmd 后输入 adb不会报错，如下图...
shell的return(没写return的函数, return的值就被称为status code? ) 类似python等语言的return, echo对标print Common options (GNU Coreutils) ‘-dfile’ ‘-ffile’ 这俩没有相互包含关系 好多参数 -n 判断是否非空 ${#var}will get the length of $var ...
How do you define an Anonymous Block of Code in Bash? This page shows you how to define a block of code in bash A non-anonymous block is a function. The block syntax is: You can use the subshell syntax but you will not get any return status (meaning... Signal in Operating System...
$ bash gettopts.sh -a t.sh: illegal option --a The first switch isSWITCH=? OPTARG= OPTIND=1 错误信息可以在开关列表的第一字符前加一个冒号进行隐藏,通过使用“:hc:”,使用错误开关-a时就不会显示错误了,但是该错误开关会被保存在OPTARG中,以便自定义错误信息用。
You can always get the exit code of the previous command from the$?variable, but seeing it right there and in color, is more direct. While I findfishandzshquite intriguing, I am still unwilling to move my setup for just a single feature. “This has to be possible in bash,” I thoug...