Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Cron job to prevent simultaneous script
Top Forums Shell Programming and Scripting Cron job to prevent simultaneous script Post 302430062 by tech9821 on Wednesday 16th of June 2010 12:36:16 PM
Old 06-16-2010
Cron job to prevent simultaneous script
I'm using a shared server on Hostgator (Linux CentOS). I'm trying to set a cron job using the Control Panel that will check if its already running before starting a new one.

I've tried the following...

Code:
* * * * * [ -z "$(ps ax|grep /pathtoscript/parse_script.php|grep -v grep)" ] && [ php /pathtoscript/parse_script.php ]


but I get this error emailed to me...

Code:
/bin/sh: line 0: [: php: unary operator expected


Any ideas how to make this work?
Last edited by Scott; 06-16-2010 at 01:46 PM.. Reason: Please use code tags
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Cron job for Perl script

Although there are many threads on this forum regarding cron, none have specifically answered my question. So hopefully someone can shed some light on what I'm doing wrong.. I have a perl script that I want to run in a cron job. Since I've read that cron doesn't have any environments set, I... (3 Replies)
Discussion started by: man
3 Replies

2. Shell Programming and Scripting

script wont run from cron job

I have written a simple bash script that will run a wget command to recursively ftp an entire directories and it's contents. #!/bin/bash wget -r -N ftp://user:pass@server//VOL1/dir If I run from the regular command line it works fine. root@BUSRV: /media/backup1$ ./gwbu When I put it in... (1 Reply)
Discussion started by: mgmcelwee
1 Replies

3. UNIX for Advanced & Expert Users

Need help with a script run by a cron job.

Hi, new to this forum and not sure if this is the right place to post. I'm new to cron jobs and scripts, and I need some help with a script to be used with a cron job. I already have a bot set up at a certain website address and need a script that the cron job will load every day that tells it to... (1 Reply)
Discussion started by: klawless
1 Replies

4. Shell Programming and Scripting

Cron job shell script..

Hey Guys, i was trying out a shell script which has to remove a file for every 90 mins. this is the code i came up with . $ crontab -e file1 file1 contains 30 1 * * * * rm -r /folder1/folder2/somefile.txt Now i need the cron to run for every 90 mins. the problem with this is... (8 Replies)
Discussion started by: Irishboy24
8 Replies

5. Shell Programming and Scripting

Running script file using cron job every 5 second

Hi All, I beginner in unix, i have no idea how to set the script file using cron job every 5 second. I also want to execute automatically the output to text file.This is my script name countsys.sh and my textfile abc.txt. (6 Replies)
Discussion started by: mastercar
6 Replies

6. UNIX for Dummies Questions & Answers

cron job for the created shell script

Hi am newbie for unix shell.. how to create a cron job for my already created shell script.:confused: Thanks! (1 Reply)
Discussion started by: vidhyaS
1 Replies

7. Solaris

cron job for phython script

Hello, How do I schedule a cron job for a phython script to run every hour? Also, in case in future I decide to edit/cancel the job how should i do it? Does it matter where my phython script is located? Also, I have am using mailx utility in my script to send me an email and dont want... (7 Replies)
Discussion started by: siddhans
7 Replies

8. UNIX for Dummies Questions & Answers

Error while running a script through cron job

Hi Team, When i am running the below query manually it is giving me the right output i.e. export PATH=/usr/sbin:/usr/bin:/sbin:/bin:$PATH ADMIN=abc@abc.com CPU_HIGH=`sar|awk '{print $9}'|sort -n|head -5|sed -n 5p` CPU_MAX=`echo "scale=3; 100-$CPU_HIGH" | bc` CPU_LOW=`sar|awk '{print... (13 Replies)
Discussion started by: Ekamjot
13 Replies

9. UNIX for Dummies Questions & Answers

Submitting cron job through script

I would like to run a script, as root, which will eventually set up cron job for a non privilege user. Please advice. (9 Replies)
Discussion started by: atanubanerji
9 Replies

10. HP-UX

How to end script in a cron job?

I've created a script to copy backup files from an HP-UX 11iv3 system to an NFS share on another machine. I want to schedule the script to run via cron. The script is simply three lines of cp /backups/Backup /shared/Backup. I've saved the script as a .sh file and call it with KSH. Do I need to... (3 Replies)
Discussion started by: jduehmig
3 Replies

LEARN ABOUT PHP

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
All times are GMT -4. The time now is 01:27 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy