need help for a bash script

[timvte]

Hello,

I need some help from you guys…
As a general idea, I need to make a bash script that should run each minute. Inside a file I have a text like: “Warning: Server 192.168.0.1 is not reachable”. The file will be deleted and another file with another text (with the same format) will be written but sometimes with a different IP (ie “Warning: Server 192.168.0.3 is not reachable”). The script should look for this text inside the file. If the part of the text (the IP in this case) is the same from the last check then do nothing. But if the IP is not the same, then do whatever…

I am thinking to take the text and place it in a temp/log file and the script should check if the last line is the same as the previous one… But I am not sure if this is the best way to do it or how to do it…

Any idea, link or help will be greatly appreciated.

PS I’m a beginner in bash scripting so do not throw with rocks

[barriehie]

Is this the only text in the file, and the only line?

Warning: Server 192.168.0.1 is not reachable

[timvte]

hi barriehie,

No, this is not the only text from the file. This is like the head of the whole file.
Meanwhile I made a line that is looking for the line and place it in a log file.

Something like:

cat /root/Dir/* | awk '!/Warning:/' >> /root/Dir2/log.log

where Dir is the directory where is the text file/s.

Then I will try to find a way to compare the last 2 lines… and then… I’ll see

[barriehie]

Okay, thinking way back to my bbs'ing days something like this:

#!/bin/bash
if [ -e /root/Dir2/flagfile ]          # flagfile indicates script has run before.
then
mv /root/Dir2/log.log /root/Dir2/log-last.log
cat /root/Dir/* | awk '!/Warning:/' >> /root/Dir2/log.log
diff /root/Dir2/log.log /root/Dir2/log-last.log > /root/Dir2/oops
oopsflag=$(ls -l /root/Dir2/oops | gawk '{ print $5 }')
if [ $oopsflag -ne 0 ]
then
#
# Do whatever when the files are different.
#
else
#
# Do whatever when the files are the same.
fi
else          # No flagfile, this is the first run.
cat /root/Dir/* | awk '!/Warning:/' >> /root/Dir2/log.log
touch /root/Dir2/flagfile
fi
exit 0

[timvte]

Thanks a lot barriehie! I will try it and i will get back

[timvte]

I tested the script and it's working as it should
There is a problem if i have more than one file in the DIR (even the text is the same or not). I've noticed some wired outputs But I will try to find a way to avoid this...
Thank you very much for your time and help

[barriehie]

I tested the script and it's working as it should
There is a problem if i have more than one file in the DIR (even the text is the same or not). I've noticed some wired outputs But I will try to find a way to avoid this...
Thank you very much for your time and help

Don't understand about more than one file but I'm glad it works!