pid | 易学教程

Get the pid of a command whose output is piped

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问题 In order to remotely start a program, log its output and immediately see that log, I'm using this script: nohup mycommand 2>&1 | tee -a server.log & Now, I would like to store in a file the pid of the newly started mycommand (whose name is very generic, I can't just use pgrep as there would be a risk of collision). If I just add echo $! > mycommand.pid I get the pid of tee . How can I reliably write the pid of mycommand to a file ? And by the way, why doesn't this give the right pid ? ( nohup

non-blocking system call in c++ program using fork

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问题 Based on this SO post, and this example, I expect that, when I use fork(), will allow me executing system/execvp in non-blocking manner. However, when I try to issue a long-running child process in a fork block in the above mentioned example code, the control does not return to parent block, till the child has finished. Can you tell a method, how I should design the code to allow non-blocking calls to system, in C/C++ code. Also, I plan to write a program, where more than one chidren are

How to make file lock with bash

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问题 I have a task to rsync a dir from remote server rsync -av root@s0.foo.com:/srv/data/ /srv/data/ To make it run regularly and avoid Script "reEnter" issue, I create a file lock "in_progress" with rsync progress's pid, which indicate whether the program is still running. lock(){ echo $1 > in_progress } Using this function to judge whether the rsync progress is still running: is_running(){ pid=$(cat in_progress) return ps aux | awk '{print $2}' | grep $pid } I can get the pid to pass to function

How to kill all recursive children of process windows

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问题 I have a question but no solution. My program run and create some processes,but processes go on creating another processes. I don't know how to get all children to kill all. I used CreateToolhelp32Snapshot function to get all children whose parent is my program(mainthread) ... and go on getting all children from each children of mainthread. hProcessSnap = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 ); If I use this solution,performance is very low because I had PID of all processes in the

mpi process ids

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问题 I would like to get the process ids of an mpi application which I start with mpirun/mpiexec tools. For example I run my code with lets say 8 processes and want to get the process ids of all these 8 processes right at the beginning of the execution to give to another tool as an input. What would be the right way to do this? 回答1: I don't believe that there is any MPI library routine which will return the pid of the o/s process which is running an MPI process. To be absolutely precise I don't

查看运行进程的详细信息

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通过top或者ps查看运行进程的时候只能看到相对路径，如何查看具体详情？先确定运行进程的pid号比如：nginx：master 15044 cd /proc 然后ls 这里面就是运行进程的所有PId号 cd 你要进入的pid ，cd 15044 执行ll 重点查看cwd和exe cwd运行进程的配置目录 exe执行程序的绝对路径 cmdline 进程运行时输入的命令行命令 environ 进程运行时的环境变量来源： CSDN 作者：诸葛中二链接： https://blog.csdn.net/qq_45124103/article/details/103460356

How find PID by port in windows and kill found tasks using java

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问题 I need kill process in java code by process port. I can do it manually in cmd like: C:\>netstat -a -n -o | findstr :6543 TCP 0.0.0.0:6543 0.0.0.0:0 LISTENING 1145 TCP [::]:6543 [::]:0 LISTENING 1145 C:\>taskkill /F /PID 1145 In java I could execute cmd command like: ProcessBuilder builder = new ProcessBuilder("cmd.exe", "/c", "netstat -a -n -o | findstr :6543"); But I don't know how get PID as output of netstat and transfer it to the "taskkill" command. Could anyone suggest me? 回答1: You can

docker背景知识1 命名空间

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如下操作都是在centos7上执行,通过cat /proc/version查看系统信息。 Linux namespace linux namespaces是Linux提供的一种内核级别环境隔离的方法，也是Container环境隔离的底层技术，Linux Namespaces共有如下种类分类系统调用参数相关内核版本 Mount namespaces CLONE_NEWNS Linux 2.4.19 UTS namespaces CLONE_NEWUTS Linux 2.6.19 IPC namespaces CLONE_NEWIPC Linux 2.6.19 PID namespaces CLONE_NEWPID Linux 2.6.24 Network namespaces CLONE_NEWNET Linux 2.6.29 User namespaces CLONE_NEWUSER Linux 3.8 Mount: mount表空间隔离，配合chroot系统调用，使程序有自己的文件系统 UTS: hostname和doaminname隔离，使应用有自己独立的主机名 IPC: 隔离进程间通讯 PID: 使程序包括子程序构造一个独立的程序集，最先创建的程序为1号pid Network: 网络空间隔离，支行在此空间的程序拥有独立的网络栈 User: 此空间下有独立的uid

getppid() not returning parent's pid [duplicate]

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问题 This question already has answers here : Why do processes I fork get systemd as their parent? (3 answers) Closed 3 years ago . I have been trying to learn about fork and processes. I just encountered a small problem with this piece of code and was trying to understand why?. I was trying to duplicate a process by a system call Fork and with the value of pid being positive, it hit the parent and its getpid() was returned. And simultaneously it hit the child and its getpid() was returned. But

Is there a way to get the process ID of a console program I've just started in the background?

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问题 Suppose I just started the following programs in the background: START /B CMD /C tomcat.exe START /B CMD /C tomcat.exe START /B CMD /C tomcat.exe and I want to kill the second one. Because they have the same image name, I can't use taskkill to kill them using tomcat.exe or I'll kill more than I want. What I want is to get the process ID of each when they're kicked off. My question is: Is there a way to get the process ID of a console program I've just started in the background? 回答1: Here's a