echo "All the command-line parameters are: "$*"" if [ $# -lt "$MINPARAMS" ] then echo echo "This script needs at least $MINPARAMS command-line arguments!" fi echo exit 0 运行代码: bash test30.sh 1 2 10 The name of this script is "test.sh". The name of this script is "t...
# 写法一 command || { echo "command failed"; exit 1; } # 写法二 if ! command; then echo "command failed"; exit 1; fi # 写法三 command if [ "$?" -ne 0 ]; then echo "command failed"; exit 1; fi 另外,除了停止执行,还有一种情况。如果两个命令有继承关系,只有第一个命令成功了,...
and should therefore be avoided for user-specified exit parameters. Ending a script withexit 127would certainly cause confusion when troubleshooting (is the error code a"command not found" or a user-defined one?). However, many scripts use anexit 1as a general bailout-upon-error....
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 should immediately call theexitcommand to stop its execution. However, is it that ...
$ bash script.sh script.sh:行3:foo:未找到命令 bar 可以看到,Bash 只是显示有错误,并没有终止执行。 这种行为很不利于脚本安全和除错。实际开发中,如果某个命令失败,往往需要脚本停止执行,防止错误累积。这时,一般采用下面的写法。 command||exit1
bash script 编程基础 1.何谓shell script shell script是利用shell的功能写一个“程序”,这个程序是使用纯文本文件,将一些shell的语法与命令写在里面。2.脚本或程序源文件都是纯文本文件。3.脚本或程序的执行一般有两种方式: 编译执行:预处理-->编译-->汇编-->链接;编译执行是一种计算机语言的执行方式。
bash-4.2$ exit exit 8、startup文件的默认调用关系 细心的用户会发现,startup 文件的加载并不像上面所述的那样简单。这是因为在 CentOS 中,startup 文件之间还存在着默认的显式调用关系,它们是: 1. ~/.bash_profile显式调用~/.bashrc文件; 2. ~/.bashrc显式调用/etc/bashrc文件; ...
# 位置参数调用, 假设在终端输入 bash bash_tutorial.sh 1 2 3 echo "current script name: \$0 $0" # 当前脚本名称 echo "incoming parameters: \$1 $1 \$2 $2 \$3 $3" # 访问传入的参数 echo "the number of parameters: \$# $#" # 传入的参数数量 echo "all parameters: \$@ $@" # ...
timeout my_cmd # if the command is failed due to timeout, aka exit code is 124, # then the script should contiune to run other commands, # otherwise it should stop. # And what if there is more exit code to ignore? other_cmds 我想我可以检查$?来控制运行流,但我想知道在Linux中是否...
echo"<the_command> could not be found"exit fi 对于Bash 特定环境: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 hash<the_command># 用于常规命令。或 type<the_command># 检查内置项和关键字 避免使用 which。它是一个外部进程,相对而言 hash、type 或 command 这样的内置程序执行效率更高,你还可...