...因此,我们可以在Python中运行ls命令,如下所示: import os os.system('ls') 这将返回当前目录( .py程序所在的位置)中的文件列表。 让我们再举一个例子。...如有关此功能的文档中所述: 运行args描述的命令。 等待命令完成,然后返回returncode属性。
Quick Example Code: importsubprocess cmd = ['netstat','-a']try: out_bytes = subprocess.check_output(cmd) out_text = out_bytes.decode('utf-8')exceptsubprocess.CalledProcessErrorase: out_bytes = e.output# Output generated before errorcode = e.returncode# Return code More: check_output() ...
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"$H...
Return a string is invalid. If no "return xxx" in function, return the result of last command. Two ways to get the return value: foo i=$? foo() { echo 3 } i=`foo` Use keyword "local" to define a local variable in function. Otherwise, the varibale in function is global. Use ...
,格式跟着标准走if(WEXITSTATUS(status)==168)printf("%s: Error - %s\n",argv[0],"The directive is not yet defined");}else//如果子进程被异常终止,打印相关信息printf("process run fail! [code_dump]:%d [exit_signal]:%d\n",(status>>7)&1,status&0x7F);//子进程异常终止的情况}return0;...
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shell的return(没写return的函数, return的值就被称为status code? ) 类似python等语言的return, echo对标print Common options (GNU Coreutils) ‘-d file’ ‘-f file’ 这俩没有相互包含关系 好多参数 -n 判断是否非空 ${#var}will get the length of $var The test command doesn't understand ==,...
returncode: int, cmd: _CMD, output: Optional[bytes] = ...) -> None: ... class Popen: stdin = ... # type: Optional[IO[Any]] stdout = ... # type: Optional[IO[Any]] stderr = ... # type: Optional[IO[Any]] pid = 0 ...
If you want to get the exit code To get the exit code of any command, use the “$?” variable alongside the echo command or printf command. Example: The “0” return code indicates that the command was successful. It implies that the file “intro.txt” exists and the Linux/UNIX syste...
On lines 33-35, I wait for thescptask to finish, get the return code, and if it's an error, abort. On line 37, I check that the file could be parsed, otherwise, I exit with an error. So how does the error handling look now?