isspecial variable that holds thereturnvalue of the recently executed command. echo"Process with PID $pid has finished with Exit status: $?"
Linux 命令(253)—— command 命令(builtin) shellcommandpath command 用于运行指定命令,以抑制正常的 Shell 函数查找。仅执行内置命令或 PATH 中的命令。 恋喵大鲤鱼 2023/02/23 4720 10-2 控制进程 shell 二、控制进程 现在已经知道了如何查看和监控进程,接下来见识一下如何对进程进行控制。 将使用一个名为...
JID-标识要等待的后台进程的作业ID,仅适用于当前Shell执行环境中的wait调用。 wait JID wait命令的退出返回值取决于指定的最后一个PID / JID。当任何进程异常终止时,退出状态将大于128。 当wait命令后面没有接参数,并且当前shell知道的所有进程ID都已终止时,Wait命令将以0值退出。 如果wait命令检测到任何...
Shell-使用&和wait让你的脚本并行执行 概述 我们知道shell中的命令都是串行执行的,如果想要充分利用服务器的资源,就需要些小技巧了。 假定业务上多个业务逻辑没有先后关系,每个脚本的执行时间也很长 ,推荐并行执行。 一般情况下,我们会把每个业务逻辑写到一个单独的脚本里,在服务器上逐一调用,每次都要手工去敲命令。
The wait command is typically used in shell scripts that spawn child processes that execute in parallel. To illustrate how the command works, let’s create the following script: #!/bin/bashsleep30&process_id=$!echo"PID:$process_id"wait$process_idecho"Exit status:$?" ...
The Linux wait command The Linux wait command, or Bash wait command, is an essential Bash shell command that primarily halts your script from processing further and waits for a specified process to complete or exit before continuing. This command is used to prevent conflicts in the flow of you...
waitis a built-in shell command. Exit values If one or more arguments (pid or job-id) are specified, the exit status ofwaitis the exit status of the last argument. If you specified ajob-idthat has terminated or is unknown by the invoking shell, an error message and a return code of...
How to initiate a linux (shell) command from... Learn more about shell, linux, command, matlab, return, unix, system, script MATLAB
shell脚本就是由Shell命令组成的执行文件,将一些命令整合到一个文件中,进行处理业务逻辑,脚本不用编译即可运行。它通过解释器解释运行,所以速度相对来说比较慢。 shell脚本中最重要的就是对shell命令的使用与组合,再使用shell脚本支持的一些语言特性,完成想要的功能。
When an asynchronous list is started by the shell, the process ID of the last command in each element of the asynchronous list becomes known in the current shell execution environment. If thewaitutility is invoked with no operands, it will wait until all process IDs known to the invoking she...