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Full Discussion: Check if PID exists
Top Forums Shell Programming and Scripting Check if PID exists Post 302778805 by alister on Monday 11th of March 2013 03:25:30 PM
Old 03-11-2013
Quote:
Originally Posted by Chubler_XL
Code:
if ps -p $PID > /dev/null 2>&1
then
    echo "Process is still running"
else
    echo "Process has stopped"
fi

In my opinion, if existence is all that's to be tested, this is by far the sanest suggestion in this thread. There's no point in generating extensive ps output only to search for something that was already known before ps was invoked (the pid).

radoulov's suggestion should be used, however, if what really matters is whether or not a process can be terminated by the effective user id running the shell script.

Regardless, there's no need for any ps | [grep | awk] pipelines.

Regards,
Alister
 

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LEARN ABOUT LINUX

pldd

PLDD(1) 							 Linux User Manual							   PLDD(1)

NAME

       pldd - display dynamic shared objects linked into a process

SYNOPSIS

       pldd PID
       pldd OPTION

DESCRIPTION

       The  pldd  command  displays a list of the dynamic shared objects that are linked into the process with the specified process ID.  The list
       includes the libraries that have been dynamically loaded using dlopen(3).

OPTIONS

       -?, --help
	      Display program help message.

       --usage
	      Display a short usage message.

       -V, --version
	      Display the program version.

VERSIONS

       pldd is available since glibc 2.15.

CONFORMING TO

       The pldd command is not specified by POSIX.1.  Some other systems have a similar command.

EXIT STATUS

       On success, pldd exits with the status 0.  If the specified process does not exist, the user does not have permission to access its dynamic
       shared  object  list, or no command-line arguments are supplied, pldd exists with a status of 1.  If given an invalid option, it exits with
       the status 64.

EXAMPLE

       $ echo $$	       # Display PID of shell
       1143
       $ pldd $$	       # Display DSOs linked into the shell
       1143:	 /usr/bin/bash
       linux-vdso.so.1
       /lib64/libtinfo.so.5
       /lib64/libdl.so.2
       /lib64/libc.so.6
       /lib64/ld-linux-x86-64.so.2
       /lib64/libnss_files.so.2

NOTES

       The command

	    lsof -p PID

       also shows output that includes the dynamic shared objects that are linked into a process.

SEE ALSO

       ldd(1), lsof(1), dlopen(3), ld.so(8)

GNU
								    2014-09-27								   PLDD(1)
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