Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: how to capture PID for a child script
Top Forums Shell Programming and Scripting how to capture PID for a child script Post 302333741 by kshji on Tuesday 14th of July 2009 02:49:21 AM
Old 07-14-2009
My PID $
Child PID !
echo $$
startsome &
ChildPID=$!
# wait children = done the job
wait $ChildPID

PID value is good ex. to use unique tmpfile
tmpf="/var/tmp/$$.tmp"
...
rm -f "$tmpf" 2>/dev/null
or timestamp:
Code:
stamp="$( date '+%Y%m%d%H%M%S' ).$$"

If you like to do tmp remove automatic on exit, then you must catch the exit signal

Code:
tmpf="/var/tmp/$$.tmp"

cleantmp()
{
    echo "cleaning tmp files ..."
    rm -f "$tmpf" 2>/dev/null
}

#main
trap 'cleantmp'   EXIT
do_your_job
use_tmpf "$tmpf"

# on exit your tmp file is removed, if process is not stopped using signal 9 (=and I mean it).

 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Script to kill all child process for a given PID

Is there any build in command in unix to kill all the child process for a given process ID ? If any one has script or command, please let me know. Thanks Sanjay (4 Replies)
Discussion started by: sanjay92
4 Replies

2. Programming

Child Process PID

Hi, Can anybody solve this query? A parent process forks 2 child processes. How does the child process know it's PID without the parent process sending it. Apart from the "ps-ef" option, what other options are there if any? (2 Replies)
Discussion started by: skannan
2 Replies

3. Programming

printing ppid,child pid,pid

question: for the below program i just printed the value for pid, child pid and parent pid why does it give me 6 values? i assume ppid is 28086 but can't figure out why there are 5 values printed instead of just two! can someone comment on that! #include<stdio.h> #define DIM 8 int... (3 Replies)
Discussion started by: a25khan
3 Replies

4. Shell Programming and Scripting

In ksh, how does an in-line child sub-process get its own PID?

This is not the same as a few of the other posted items dealing with sub-process pids (that I saw anyway). If zot contains: echo "main mypid: $$ - lastpid: $!" ( echo "block mypid: $$ - lastpid: $! - ppid: $PPID" ps -ef > xxx sleep 5 echo "block mypid: $$ - lastpid: $! - ppid:... (6 Replies)
Discussion started by: MichLab
6 Replies

5. Shell Programming and Scripting

child pid in ZSH

I am using ZSH shell in Linux. I am calling a child program in background mode parallely (say 2-3 threads). I have problem in handling the temporary files of these child programs since the temp file names are unique for all the child process. To distinguish i want to use the pid in the temp... (3 Replies)
Discussion started by: dhams
3 Replies

6. Shell Programming and Scripting

PID Capture and Return Codes

I have a process that copies files from a main storage server to main other servers. We are attempting to speed up the processing and have thought that the best method would be to use concurrent file copying. What was suggested is that we change from using a simple RCP and waiting for it to... (3 Replies)
Discussion started by: dorrellg
3 Replies

7. Programming

How to capture messages from child process?

Hi all, I'm new in programming, but want to start writing a simple GUI for linux console application,say, wget.(for educational purpose :) ). The question is: how to start child process from C++ code and then start capture messages from its stdout? Thanks in advance. (2 Replies)
Discussion started by: vahagn_iv
2 Replies

8. Red Hat

Listing all child pid and deleting it in reverse order

Hi , My problem is that I am not able to list all process id of any process. If you see pstree command it shows many process id under https. But if I run ps command its not listing all the process id for httpd. It is just listing the PPID and immediate child process id only. I... (4 Replies)
Discussion started by: pratapsingh
4 Replies

9. Shell Programming and Scripting

How to capture exit code of child script and send it to parent script?

#!/usr/local/bin/bash set -vx /prod/HotelierLinks/palaceLink/bin/PalacefilesWait /prod/HotelierLinks/palaceLink/bin/prodEnvSetup 03212013 & if then echo "fatal error: Palace/HardRock failed!!!!" 1>&2 echo "Palace Failed" | mail -s "Link Failed at Palace/HardRock" -c... (1 Reply)
Discussion started by: aroragaurav.84
1 Replies

10. Shell Programming and Scripting

Getting child process id for a given PID

HI Am trying to get child process id for a PID using ksh.. ps -ef | grep xntpd root 3342472 2228308 0 12:17:40 - 0:00 /usr/sbin/xntpd root 4522024 6488316 0 12:18:56 pts/0 0:00 grep xntpd root 6291614 3342472 0 12:17:40 - 0:00 /usr/sbin/xntpd Here now i... (1 Reply)
Discussion started by: Priya Amaresh
1 Replies

LEARN ABOUT DEBIAN

ns_mktemp

ns_tmp(3aolserver)					    AOLserver Built-In Commands 					ns_tmp(3aolserver)

__________________________________________________________________________________________________________________________________________________

NAME

       ns_mktemp, ns_tmpnam - commands

SYNOPSIS

       ns_mktemp template

       ns_tmpnam
_________________________________________________________________

DESCRIPTION

       ns_mktemp  returns  a unique filename based on the template you specify.  ns_tmpnam returns a filename that can safely be used for a tempo-
       rary file.

       The template for ns_mktemp should contain a string with six trailing Xs, which will be replaced with an alpha-numeric string of six charac-
       ters chosen to make the filename unique.  If template does not end with six trailing Xs the empty string will be returned.

       ns_tmpnam  calls  the  tmpnam()	C  library function, and the results will depend on your operating system.  On Irix, for example, tmpnam()
       always generate a file name using the path-prefix defined as P_tmpdir in the header file which is "/var/tmp/".

EXAMPLES

	nscp> ns_tmpnam ;# On Linux
	/tmp/filevuLwaE

	nscp> ns_mktemp /tmp/foobar.XXXXXX
	/tmp/foobar.p6SlaC

SEE ALSO

       nsd(1), mktemp(3), tmpnam(3)

KEYWORDS

AOLserver								4.0							ns_tmp(3aolserver)
All times are GMT -4. The time now is 09:14 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy