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What is wrong with running unix processes with &?


What is wrong with running unix processes with &?

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What is wrong with running unix processes with &?
Tag : shell , By : Waheedoo
Date : November 24 2020, 03:41 PM


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Which is the best way to get a list of running processes in unix with python?


Tag : python , By : micaleel
Date : March 29 2020, 07:55 AM
hop of those help? This works on Mac OS X 10.5.5. Note the capital -U option. Perhaps that's been your problem.
import subprocess
ps = subprocess.Popen("ps -U 0", shell=True, stdout=subprocess.PIPE)
print ps.stdout.read()
ps.stdout.close()
ps.wait()
Python 2.5.2 (r252:60911, Feb 22 2008, 07:57:53) 
[GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin

Unix : How to modify and redirect stdout of all running processes


Tag : linux , By : CodeOfficer
Date : March 29 2020, 07:55 AM
This might help you From the discussion it turned out that you not really intended to redirect the output of already running processes to somewhere else. But you seem to be trying to modify the output of a process you are starting .
With bash (seems to be what you are using) you may use [FD]>TARGET resp. [FD]. (2 is the well-known file descriptor for stderr). TARGET or SOURCE my be file system objects (e.g. files, devices, named pipes, unix domain sockets) or &FD where FD again is a file descriptor number and indicates the (open) filedescriptor to use.
awk '{ print "'"$SOME_ENV_VAR"'|" $0;}'
awk -v var="$SOME_ENV_VAR" '{ print var "|" $0;}'
(((echo hallo; echo ERROR >&2) | awk '{ print "stdout|" $0; }' >&4) 2>&1|  awk '{ print "stderr: " $0;}' ) 4>&1   

How to list all the running processes by using UNIX-C/C++


Tag : linux , By : xie renhui
Date : March 29 2020, 07:55 AM

Running two processes in Unix/Linux


Tag : linux , By : Ben Brown
Date : March 29 2020, 07:55 AM

Unix : Running Processes in Parallel : 2 Instances only


Tag : shell , By : Shane
Date : March 29 2020, 07:55 AM
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