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top output to file on cron plzz help

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  #1  
Old
New Member
 
Join Date: Aug 2005
Location: Moonachie, New Jersey
Posts: 3

top output to file on cron plzz help


I thought i had resolved the problem only to find the the script only works correctly if i run it manually.
I entered it to run with a cron job to run every 5 minutes and it does run every 5 minutes. It also gives me part of the output i request but it will not give the "top" output. this is what i did for starters

while in root i entered a cron job using
crontab -e

this is the entry:

*/5 * * * * /usr/local/bin/ht_stat.sh a > /dev/null

This is the script i created:

# This script has been giving uptime,date and httpd info every 5 minutes since sept. 01,'05.

echo `date` >> /home/rau/htstat/htstat.txt

uptime >> /home/rau/htstat/htstat.txt

echo "HTTPD `ps -f | grep httpd | wc -l`" >> /home/rau/htstat/htstat.txt

echo "" >> /home/rau/htstat/htstat.txt

#I'm adding these 2 lines of code to get a top reading in the same intervals and put a line of space between the orginal reading and the top readings.

top -n 1 >> /home/rau/htstat/htstat.txt
echo "" >> /home/rau/htstat/htstat.txt

This is my output if the cron run the job:

Fri Sep 16 09:55:01 EDT 2005
09:55:01 up 56 days, 21:31, 115 users, load average: 0.53, 0.48, 0.37
HTTPD 2


Fri Sep 16 10:00:00 EDT 2005
10:00:00 up 56 days, 21:36, 115 users, load average: 0.38, 0.41, 0.36
HTTPD 2


Fri Sep 16 10:05:00 EDT 2005
10:05:00 up 56 days, 21:41, 115 users, load average: 0.06, 0.22, 0.29
HTTPD 2

If i run the the job manually:

./ht_stat.sh

I get the desired output like so:


Fri Sep 16 10:25:35 EDT 2005
10:25:35 up 56 days, 22:02, 115 users, load average: 0.18, 0.60, 0.58
HTTPD 1
top - 10:25:35 up 56 days, 22:02, 115 users, load average: 0.18, 0.60, 0.58
Tasks: 163 total, 1 running, 162 sleeping, 0 stopped, 0 zombie
Cpu(s): 3.8% us, 3.2% sy, 5.7% ni, 87.0% id, 0.2% wa, 0.0% hi, 0.0% si
Mem: 516684k total, 469844k used, 46840k free, 169848k buffers
Swap: 1052248k total, 65216k used, 987032k free, 90188k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
10745 root 18 0 1984 892 1620 R 1.9 0.2 0:00.03 top
1 root 16 0 2704 292 1316 S 0.0 0.1 0:03.31 init
2 root 34 19 0 0 0 S 0.0 0.0 0:00.10 ksoftirqd/0
3 root 5 -10 0 0 0 S 0.0 0.0 0:04.36 events/0
4 root 5 -10 0 0 0 S 0.0 0.0 0:00.02 khelper
5 root 13 -10 0 0 0 S 0.0 0.0 0:00.00 kacpid
20 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 kblockd/0
21 root 15 0 0 0 0 S 0.0 0.0 0:00.00 khubd
33 root 15 0 0 0 0 S 0.0 0.0 0:27.96 pdflush
35 root 7 -10 0 0 0 S 0.0 0.0 0:00.00 aio/0
34 root 15 0 0 0 0 S 0.0 0.0 0:12.32 kswapd0

184 root 15 0 0 0 0 S 0.0 0.0 0:07.93 kjournald
668 root 15 0 0 0 0 S 0.0 0.0 0:00.00 kjournald
669 root 15 0 0 0 0 S 0.0 0.0 0:00.30 kjournald
670 root 15 0 0 0 0 S 0.0 0.0 0:00.19 kjournald
671 root 15 0 0 0 0 S 0.0 0.0 0:05.28 kjournald
672 root 15 0 0 0 0 S 0.0 0.0 0:09.25 kjournald
1066 root 16 0 2568 572 1648 S 0.0 0.1 0:26.30 dhclient
1097 root 16 0 3064 380 1296 S 0.0 0.1 0:04.09 syslogd
1101 root 16 0 2500 252 1244 S 0.0 0.0 0:00.04 klogd
1138 rpcuser 22 0 3252 272 1380 S 0.0 0.1 0:00.00 rpc.statd
1163 root 16 0 2580 300 1296 S 0.0 0.1 0:01.60 rpc.idmapd
1203 root 18 0 2252 268 1532 S 0.0 0.1 0:00.00 hcid
1210 root 10 -10 0 0 0 S 0.0 0.0 0:00.00 krfcommd
1229 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rpciod
1230 root 21 0 0 0 0 S 0.0 0.0 0:00.00 lockd
1235 root 17 0 8560 292 6704 S 0.0 0.1 0:00.00 mount.smbfs

You have new mail in /var/spool/mail/root

I just don't know why it works one way and not the other, somebody pleezz help me - caligal



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  #2  
Old
Web Hosting Master
 
Join Date: Aug 2005
Location: Canada
Posts: 838
Maybe the $PATH isn't the same in cronjob.
Put "printenv|sort" type of thing to check the env vars.
Use full path to commands.

Also, some commands output data to stderr.
Add "exec 2>&1" to the beginning
or instead of just > /dev/null, 2>>/path-to/error.log
or something so that you get stderr.

  #3  
Old
Junior Guru
 
Join Date: Mar 2006
Posts: 221
Do you see any errors in the cron log file /var/log/cron when your script executes ?

Instead of trying this

*/5 * * * * /usr/local/bin/ht_stat.sh a > /dev/null

you may also try this

*/5 * * * * /usr/local/bin/ht_stat.sh a > /dev/null 2>&1

Regards,
Rose
rose@instacarma.com

__________________
Regards,
Rose [rose@instacarma.com]
InstaCarma.com
24x7 Technical Support and Server Management

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  #4  
Old
Web Hosting Master
 
Join Date: Apr 2003
Location: UK
Posts: 2,560
tried running top in batch mode (-b) ?

  #5  
Old
Web Hosting Master
 
Join Date: Aug 2005
Location: Canada
Posts: 838
Guys, it's an old old thread....

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