如果返回码为0,表示命令执行成功;否则,表示命令执行失败。 import subprocess result = subprocess.run(['ls', '-l'], capture_output=True, text=True) if result.returncode == 0: print('Command executed successfully') else: print('Command
BASH_EXECUTION_STRING 其中含有使用“-c”选项调用bash时的命令参数。 BASH_LINENO 一个数组变量,其数组元素是相应于FUNCNAME数组变量每个成员的源代码文 件中的行号。使用LINENO变量可以获取当前的行号。 BASH_REMATCH 一个只读数组变量,其元素0是匹配整个正则表达式的字符串部分,元素n是匹 配第n个加圆括号的子...
Waiting '${sleep_time} seconds' before re-trying..." /usr/bin/sleep ${sleep_time}s else break # All good, no point on waiting... fi ((now=now+1)) done return $status } DATADIR="$HOME/Documents/lshw-dump" if [ ! -d "$DATADIR" ]; then /usr/bin/mkdir -p -v "$DATADIR...
Most of the time when you run a script, you're concerned with its immediate results. Sometimes, though, the task is complex or needs to execute at a particular time, and there are many ways to achieve that goal. By the end of this article, you should be able to do the following: F...
return (EXECUTION_SUCCESS); } 编译后试验结果如下: #在原版bash下工作: lj@lj-laptop:~/bash-3.2$ ps PID TTYTIME CMD 6212 pts/200:00:00 bash 9893 pts/200:00:00 ps lj@lj-laptop:~/bash-3.2$ linjian -bash: linjian: command not found#进入修改后的bash: ...
1。 PATH 搜索命令的路径。它是一个冒号分割的目录列表,shell 从中搜索命令 ( 参见下面的 命令执行(COMMAND EXECUTION) 段落)。默认的路径是系统相 关的,是由安装 bash 的系统管 理员设置的。通常它的值是 ‘‘/usr/gnu/bin:/usr/local/bin:/usr/ucb:/bin:/usr/...
可见直接解密出来源码,对于x86的这种,支持非常的好,但事情到这是并没有结束,我的环境恰恰不是x86,而是arm架构的,下面简单介绍一下我的ARM环境。 玩客云一枚 内核信息 root@armbian:~# uname-a Linux armbian3.10.108#8SMPPREEMPTThu Nov1408:21:13UTC2019armv7lGNU/Linux ...
5.4.1Conditional Execution When writing computer programs it is often useful for your program to be able to make decisions based on inputs like arguments, files, and environmental variables. Bash provides mechanisms for creatinglogical expressionswhich resemble mathematical equations. These logical express...
The tester who is going to run this script will generally appreciate it if the script terminates shortly after being invoked in case a variable is not correct. No one likes to wait a long time in the execution of the script to find out that a variable was not properly set. ...
typedef struct command{enumcommand_type type;/* FOR CASE WHILE IF CONNECTION or SIMPLE. */int flags;/* Flags controlling execution environment. */int line;/* line number the command starts on */REDIRECT*redirects;/* Special redirects for FOR CASE, etc. */union{struct for_com*For;struct ...