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): 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。 顺便...
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...
ifCOMMANDSthen<COMMANDS>elif<COMMANDS># optional then<COMMANDS>else<COMMANDS># optional fi # required 再次强调,[是一个命令,它同其它常规的命令一样接受参数。if 是一个复合命令,它包含其它命令,[并不是 if 语法中的一部分。 如果你想根据 grep 命令的结果来做事情,你不需要把 grep 放到 [里面,只需要在...
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...
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' ]] ...
check-scripts:# Fail if any of these files have warningsshellcheck myscripts/*.sh or in a Travis CI.travis.ymlfile: script:# Fail if any of these files have warnings-shellcheckmyscripts/*.sh Services and platforms that have ShellCheck pre-installed and ready to use: ...
# Clear screen on script exit. trap 'printf \\e[2J\\e[H\\e[m' EXIT 忽略终端中断(CTRL + C,SIGINT) trap '' INT 对窗口调整大小做出反应 # Call a function on window resize. trap 'code_here' SIGWINCH 在每个命令之前做点什么 trap 'code_here' DEBUG ...
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... ...
Incorrect use of a compound command when defining a Bash Function Runtime ErrorA Runtime Error will be the next level of errors. The shell script runs with no syntax errors but fails to execute reliably certain tasks. The most common runtime errors in a shell script include: Division by ze...
$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...