shift # 跳过后面的值;;--default)#如果参数是这个,脚本会将变量DEFAULT设置为YESDEFAULT=YESshift # 跳过参数;;-*|--*)#如果参数是以-或--开头且未知的选项,打印错误信息并退出 echo"Unknown option $1"exit1;;*)#对于所有其他非选项参数(即位置参数),将它们逐一添加到POSITIONAL_ARGS数组中,POSITIONAL_ARGS...
echo "This script needs at least $MINPARAMS command-line arguments!" fi echo exit 0 运行代码: bash test30.sh 1 2 10 The name of this script is "test.sh". The name of this script is "test.sh". Parameter #1 is 1 Parameter #2 is 2 --- All the command-line parameters are: 1 ...
11.在bash中输入$bash命令,将启动一个子bash程序,用$exit命令退出子程序 12.命令组合,与优先执行 用反单引号(就是键盘上方数字键1左边的键,不是单引号)包裹命令:`命令` 或$(命令),来优先执行某个命令,然后把返回的内容作为其他命令的输入,例子如下: $ echo `ls -a` $ echo $(ls -a) 上面的命令语句...
[root@Geeklp-BashShell ~]# bash [root@Geeklp-BashShell ~]# sh sh-4.2# exit exit [root@Geeklp-BashShell ~]# bash --posix bash-4.2# 在上文中,我们能够看到sh是bash的一个软连接,但是单独输入bash和sh命令时,所呈现的效果却不一致?这里目前我并不是很清楚,麻烦有知道的小伙伴告知一下这是为...
exit 192 fi # Process the parameters while [ $# -gt 0 ] ; do case “$1” in -h | --help) # Show help printf “%s\n” “usage:$SCRIPT [-h][--help] -c companyid” exit 0 ;; -c ) shift if [ $# -eq 0 ] ; then ...
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: ...
上面还可以看得出来,login shell 下可以用 logout 或者 exit 退出,而 non-login shell 下面,则只能使用 exit 退出。 因此判断是否是 login shell 也是配置 bash/zsh 的基本问题,正确的区分两种模式,可以给真正登陆的用户在登陆前显示更多有用的提示语或者执行某些初始化命令,而登陆过后使用普通 su 切换用户的时候...
echo 'Must supply a parameter, exiting.' >&2 exit 1 ;; *) echo 'Unknown error, exiting.' >&2 exit $status esac 引用链接 [1] Bash Pitfalls:http://mywiki.wooledge.org/BashPitfalls [2] 不应该让脚本去解析 ls 命令的结果:http://mywiki.wooledge.org/ParsingLs ...
exit kill 1. Overview A good Bash script usually performs some checking before executing the commands it contains. For example, a script that executes administrative commands should check if the script is called by the root user or withsudoaccess. If a less-privileged user calls the script, it...
Exit Codes With Special Meanings Table E-1. Reserved Exit Codes Exit Code NumberMeaningExampleComments 1 Catchall for general errors let &qu