03-11-2009
Finding the nice(ni) number with PID?
Hi, is there a command that takes the PID of a process and that only diplays it's ni number?
I`m pretty sure it would require pipes but I tried a few things that ended up miserably...
Since the ps command doesn't show the ni unless I do ps -o ni but then I can't find a way to search the right process by PID number.
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
How is it possible under UNIX to restrain the number of digits of the PID number?
For instance, we have a product that generates a PID of 7 digits, and we would like to have only 6 digits maximum instead for the PID.
Thank you for your help. (1 Reply)
Discussion started by: mlefebvr
1 Replies
2. Filesystems, Disks and Memory
Can some one please tell me how to find out the proccess ID that is holding up a file.
I am attempting to remove a file and I am getting a message stating that it is busy.
i.e
rm filename
filename: 777 mode ? (y/n) y
rm: filename not removed. Text file busy
Thanks in advance. (1 Reply)
Discussion started by: jxh461
1 Replies
3. Programming
Hi I want to implement the nice command in the shell that I am building. I came to know that there is a corresponding nice() system call for the same. But since I will be forking different processes to run different commands typed on the command prompt, is there any way I can make a command... (2 Replies)
Discussion started by: tejbuch
2 Replies
4. UNIX for Dummies Questions & Answers
Hello guys,
How to shut down a port number in AIX.
May be first I need to find out what is the process ID of that process that listens to this particular port.. Is there any command to find a process ID from the port number other than "lsof".
thanks (1 Reply)
Discussion started by: solaix14
1 Replies
5. Shell Programming and Scripting
Hi All,
Am copying mulitple files in a directory in names File0,File1,File2 etc.
I need to print separately the PID of these copies using File names.
for((i=0;i<5;i++))
do
mypid=`ps aux | awk '/File$i/ && !/awk/ { print $2 }'`
echo PID is $mypid
done
It printed nothing. Thinking... (6 Replies)
Discussion started by: amio
6 Replies
6. Solaris
Say I have 2 processes(perl scripts on Solaris machine) A and B.
the process A kill the process B.
While in the process B how do I print the PID of the process that Killed it(process A) before dieing.
My process A looks like
open(STATS, "ps -ef|");
while ($inputLine = <STATS>) {
if... (7 Replies)
Discussion started by: enigma_007
7 Replies
7. Red Hat
What is a PID number? (3 Replies)
Discussion started by: nariangel
3 Replies
8. Shell Programming and Scripting
The end result that I'd like is to terminate any process on my ps -u username list that extends beyond 20 minutes. I know for a fact that this process will be named l.exe, but I don't know the number in between and I won't know the PID. Is there a way to use grep or pidof to do this task every 20... (2 Replies)
Discussion started by: Bolanok
2 Replies
9. Shell Programming and Scripting
Hello All,
I am facing difficulty in getting the PID value & then assigning it to a variable,
kindly help me in resolving the issue.
Thanks a lot in advance.
The custom utility used inside the Test2.sh will process the file in a batch of 10 lines at once and for efficient memory management,... (3 Replies)
Discussion started by: duddukuri
3 Replies
10. Shell Programming and Scripting
Hello All,
I need to run a set of scripts, say 50 of them, parallely. I'm running these 50 scripts, from inside a script with the help of 'nohup' command.
1.The fifty scripts are stored in a separate file.
2.In a master script, i'm reading every line of the file through loop and executing... (4 Replies)
Discussion started by: SriRamKrish
4 Replies
LEARN ABOUT OPENDARWIN
shlock
SHLOCK(1) BSD General Commands Manual SHLOCK(1)
NAME
shlock -- create or verify a lock file for shell scripts
SYNOPSIS
shlock -f lockfile [-p PID] [-u] [-v]
DESCRIPTION
The shlock command can create or verify a lock file on behalf of a shell or other script program. When it attempts to create a lock file, if
one already exists, shlock verifies that it is or is not valid. If valid, shlock will exit with a non-zero exit code. If invalid, shlock
will remove the lock file, and create a new one.
shlock uses the rename(2) system call to make the final target lock file, which is an atomic operation (i.e. "dot locking", so named for this
mechanism's original use for locking system mailboxes). It puts the process ID ("PID") from the command line into the requested lock file.
shlock verifies that an extant lock file is still valid by using kill(2) with a zero signal to check for the existence of the process that
holds the lock.
The -f argument with lockfile is always required.
The -p option with PID is given when the program is to create a lock file; when absent, shlock will simply check for the validity of the lock
file.
The -u option causes shlock to read and write the PID as a binary pid_t, instead of as ASCII, to be compatible with the locks created by
UUCP.
The -v option causes shlock to be verbose about what it is doing.
RETURN VALUES
A zero exit code indicates a valid lock file.
EXAMPLES
BOURNE SHELL
#!/bin/sh
lckfile=/tmp/foo.lock
if shlock -f ${lckfile} -p $$
then
# do what required the lock
rm ${lckfile}
else
echo Lock ${lckfile} already held by `cat ${lckfile}`
fi
C SHELL
#!/bin/csh -f
set lckfile=/tmp/foo.lock
shlock -f ${lckfile} -p $$
if ($status == 0) then
# do what required the lock
rm ${lckfile}
else
echo Lock ${lckfile} already held by `cat ${lckfile}`
endif
The examples assume that the filesystem where the lock file is to be created is writeable by the user, and has space available.
HISTORY
shlock was written for the first Network News Transfer Protocol (NNTP) software distribution, released in March 1986. The algorithm was sug-
gested by Peter Honeyman, from work he did on HoneyDanBer UUCP.
AUTHOR
Erik E. Fair <fair@clock.org>
BUGS
Does not work on NFS or other network filesystem on different systems because the disparate systems have disjoint PID spaces.
Cannot handle the case where a lock file was not deleted, the process that created it has exited, and the system has created a new process
with the same PID as in the dead lock file. The lock file will appear to be valid even though the process is unrelated to the one that cre-
ated the lock in the first place. Always remove your lock files after you're done.
BSD
June 29, 1997 BSD