01-20-2006
Quote:
Originally Posted by rmulchandani
I have a script which must not be run more than once at any given time. THis script will be scheduled to run every 20 mins as a cron job.
In my script can i have logic to say if this script is already running from the previous cron, then exit.
How do i go about doing that. If you describe the approach, can you please specify just the commands, which i can man to construct my approach.
Because I am not familiar with unix commands, if you tell me "find the file and do stuff..." i may not know the command to "find the file".
thanks!
write a tmp file to the /tmp directory.
have your script check to see if the file exists, if it does then don't run.
#!/bin/sh
# our tmpfile
tmpfile="/tmp/mytmpfile"
# check to see if it exists.
# if it does then exit script
if [[ -f ${tmpfile} ]]; then
echo script already running.
exit
fi
# it doesn't exist at this point so lets make one
touch ${tmpfile}
# do whatever now.
# end of script
rm ${tmpfile}
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi guys I'm very new to unix and I have to create an awk script that detects webpage addresses from a file/webpage and outputs how many times each webpage was detected.e.g. if my file was:
(Note: The symbol " was added to stop them being created into links)
"www.google.com"... (1 Reply)
Discussion started by: ROFL
1 Replies
2. Shell Programming and Scripting
Hi guys I'm very new to unix and I have to create an awk script that detects webpage addresses from a file/webpage and outputs how many times each webpage was detected.e.g. if my file was:
www.google.com
www.facebook.com
www.google.com
the output should be:
www.google.com x2... (2 Replies)
Discussion started by: ROFL
2 Replies
3. Shell Programming and Scripting
Dear community,
what I'm try to do is deny users to run a script without parameters from command bash, but the same script should run without parameters only from crontab.
Example runs by crontab:*/5 * * * * /tmp/script.sh
Here the normal execution starts every 5 minutes
Example #1 runs by... (16 Replies)
Discussion started by: Lord Spectre
16 Replies
4. Shell Programming and Scripting
I wish to print my current shell which happens to be bash in my script check.sh
more check.sh
echo $0
echo `ps -p $$`
But instead of printing it prints check.sh i.e the name of the script for both the commands.
Can you please suggest how to print the current shell i m on inside the... (2 Replies)
Discussion started by: mohtashims
2 Replies
5. Shell Programming and Scripting
Hi all,
I am needing some help with a script that will search for a video file by known extensions and then do a pattern search (I'm guessing via regex) and then based on a match of one type of another move the file to an assigned directory.
I would like to do this with either a shell script... (7 Replies)
Discussion started by: Simplify
7 Replies
6. Shell Programming and Scripting
Hello,
I am running a python file from terminal and I wish to see which code is running at background. When I use htop, I see just a few commands, unable to see entire command.
htop > report
nano report
Output:
^
Following parts of ffmpeg line is not shown by htop. Just showing... (7 Replies)
Discussion started by: baris35
7 Replies
7. UNIX for Advanced & Expert Users
Hi forum,
So I am trying to determine the OS type with the following script:
#!/usr/bin/sh
OStype1=`uname -s`
Sunos1=SunOs
if
then
echo "This system is Linux"
exit 0
elif
then
echo "This system is SunOs"
exit 0
elif (1 Reply)
Discussion started by: dampio
1 Replies
8. UNIX for Beginners Questions & Answers
Hello there,
I am not an expert in networking related stuff but I got a requirement to create UNIX script to query our Company's internal time source via NTP for time drift detect and report it when > +/- 50ms.
I have been googling a lot but thought to post it in this forum to get a... (1 Reply)
Discussion started by: Green_Star
1 Replies
9. HP-UX
Hello there,
I am not an expert in networking related stuff but I got a requirement to create UNIX script to query our Company's internal time source via NTP for time drift detect and report it when > +/- 50ms.
I have been googling a lot but thought to post it in this forum to get a... (17 Replies)
Discussion started by: Green_Star
17 Replies
10. Shell Programming and Scripting
Hello,
I have a small script and it runs from web application in below format:
pipe:///path_to_myscript.sh url1 url2 url3
myscript.sh:
#!/bin/bash
count=0
while
do
count=$((count+1))
exec 3>&1
((ffmpeg -i $1 ...... -f mpegts pipe:1 2>/dev/null 1>&3 ) 2>&1 | \
while read LINE; do echo... (9 Replies)
Discussion started by: baris35
9 Replies
uudemon(4) Kernel Interfaces Manual uudemon(4)
NAME
uudemon.admin, uudemon.cleanu, uudemon.hour, uudemon.poll - Administrative shell scripts for polling remote systems, cleaning up spool
directories, reporting status to the system administrator, and routine invocations of the uuxqt and uusched daemons
SYNOPSIS
These shell scripts reside in the following directory:
/usr/lib/uucp
DESCRIPTION
All the scripts can be run from the command line or can be run automatically by the cron daemon. To automatically run the scripts, remove
the comment character (#) from the beginning of the relevant line in the /var/spool/cron/crontabs/uucp file.
This script reports status to the system administrator. It issues the uustat command to find out the status of uucp jobs. It mails the
results to the uucp login ID. The script may be modified to send mail to any login ID such as the uucp administrative login ID (uucpa) or
root. This script cleans up the /var/spool/uucp and /var/spool/uucppublic directories by running the uucleanup command. The uucleanup com-
mand is run with the following parameters: -C7, -D7, X2, -o2, -W1. This script runs the uusched and uuxqt daemons in the background. This
script polls the systems listed in the /usr/lib/uucp/Poll file. The uudemon.poll script should be scheduled before the uudemon.hour
script. This allows uudemon.poll to create any command files before cron runs the uudemon.hour script.
FILES
Contains the uudemon.admin, uudemon.cleanu, uudemon.hour and uudemon.poll files. Contains the uucp file.
RELATED INFORMATION
Commands: cron(8), uucleanup(8), uusched(8), uuxqt(1)
Files: /usr/lib/uucp delim off
uudemon(4)