如果你想要在标准输出同时输出自定义的错误提示,可以使用复合命令(command grouping[17]): cd /net || { echo "Can't read /net. Make sure you've logged in to the Samba network, and try again."; exit 1; } do_stuff more_stuff 注意,在{号和 echo 之间需要有一个空格,同时}之前要加上分号。
EN连续两次求贤令：曾经我给你带来了十万用户，但现在祝你倒闭，以及 生信技能树知识整理实习生招募，让...
ifgrep-q fooregex myfile;then...fi 如果grep 在 myfile 中找到匹配的行,它的执行结果为 0(true),then 后面的部分就会执行。 10. if [bar="$foo"]; then ... 正如上一个问题中提到的,[是一个命令,它的参数之间必须用空格分隔。 11. if [ [ a = b ] && [ c = d ] ]; then ... 不...
如果你想要在标准输出同时输出自定义的错误提示,可以使用复合命令(command grouping[17]): 复制 cd/net || {echo"Can't read /net. Make sure you've logged in to the Samba network, and try again.";exit1; } do_stuff more_stuff 1. 2. 3. 注意,在{号和 echo 之间需要有一个空格,同时}之前要...
While ShellCheck is mostly intended for interactive use, it can easily be added to builds or test suites. It makes canonical use of exit codes, so you can just add ashellcheckcommand as part of the process. For example, in a Makefile: ...
27. local varname=$(command) 28. export foo=~/bar 29. sed 's/$foo/good bye/' 30. tr [A-Z] [a-z] 31. ps ax | grep gedit 32. printf "$foo" 33. for i in {1..$n} 34. if [[ $foo = $bar ]] 35. if [[ $foo =~ 'some RE' ]] ...
$badcommand# it fails... $echo $?1 $ Discussion Theexit statusof a commandis kept in the shell variable referenced with$?. Its value can range from 0 to 255. When you write a shell script, it’s a good idea to have your script exit with zero if all is well and a nonzero valu...
Version 3.7.2 2005/11/16 作者:Mendel Cooper mail:thegrendel@theriver.com 这本书假定你没有任何脚本或一般程序的编程知识,但是如果你有相关的知识,那么你将很容易 达到中高级的水平...all the while sneaking in little snippets of UNIX? wisdom and lor... ...
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...
Bash's exit status is the exit status of the last command executed in the script. If no commands are executed, the exit status is 0. An attempt is first made to open the file in the current directory, and, if no file is found, then the shell searches the directories in PATH for ...