HOST="google.com"ping -c1$HOST # -c is usedforcount, it will send the request, number of times mentionedRETURN_CODE=$? # 最后运行的命令的结束代码(返回值)即执行上一个指令的返回值if["$RETURN_CODE"-eq"0"]thenecho"$HOST reachable"elseecho"$H...
While ShellCheck is mostly intended for interactive use, it can easily be added to builds or test suites. It makes canonical use of exit codes, so you can just add ashellcheckcommand as part of the process. For example, in a Makefile: ...
12. Inside each script, capture the return code of each line command One way to determine the success or failure of the function testing is by counting the line commands that have failed, that is, that have a return code different than 0. The variable "$?" provides the return code of ...
Bash functions differ from most programming languages when it comes to returning a value from a function. By default, bash returns the exit status of the last executed command in the function's body. The script below shows how to specify the exit status using return: 1. Create a script and...
/bin/sh # http://code.google.com/p/mooon # 通用的停止指定名的进程 # 特色: # 1. 只会停止当前用户名下的进程 # 2...可以指定命令行参数,可执行精准停止 # 检查参数 # 参数1:需要停止的进程名或它的完整命令行或部分命令行 if test $# -ne 1; t...
it returned a1, which was the return value ofbadcommand. But theechocommand itself succeeds, and therefore the new, most recent status is success (i.e., a0value).Because you only get one chance to check the exit status, many shell scripts will immediately assign the status to another ...
args=("$@")# check required params and arguments[[-z"${param-}"]]&&die"Missing required parameter: param"[[${#args[@]}-eq0]]&&die"Missing script arguments"return0}parse_params"$@"setup_colors # script logic here msg"${RED}Read parameters:${NOFORMAT}"msg"- flag: ${flag}"msg"...
Use the "id" command to check if the user exists. If the user exists, the "id" command will return successfully (exit code 0), otherwise, it will return an error (exit code 1). Redirect the output of 'id' to /dev/null to suppress any output. ...
-rw-r--r--. 1 BashShell BashShell 257 11月 6 2013 check-number-of-command-line-arguments -rw-r--r--. 1 BashShell BashShell 75 11月 6 2013 create-tempfile -rw-r--r--. 1 BashShell BashShell 886 12月 12 2013 create-tempfile-in-secure-manner ...
Syntax: return [n] where n is a number. If n is not supplied, then it will return the exit code of the last command run. Though, the possible value range for the return builtin is limited to the least significant 8 bits which are 0 to 255. Any number above 255 will just return ...