Shell script to tail a file with unknown numbers


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# 8  
so the output goes to a file which needs to be sent to the requestor

Code:
tail < filename> | tail -100 > /tmp/log.a
tail < filename> | tail -200 > /tmp/log.b
tail < filename> | tail -500 > /tmp/log.c
cat < filename> ( full file ) > /tmp/log.e
cat < filename> | grep "sept 10 2019"> /tmp/log.f
cat <filename> | grep encrypt > /tmp/log.g

as this request comes few times in a day so if it can be automated though a script then don't have to do same thing again and again

Thanks a lot in advance

Moderator's Comments:
Mod Comment Use code tags..... warning issued
# 9  
Hi,

You would just use somethin like this, but choose your logic to suit the most likely condition.

Code:
if [[ `grep "encrypt" /tmp/log.g` != "0" ]]
then
exit 0
else
mailx -s "Message Title." user@domain < /tmp/log.g
fi

You may want to build in checking or rotation on the logfile to ensure that you dont get the same notification time after time, this could be scripted to run as a cron job.

Regards

Gull04
# 10  
Just for the fun of it - how far would this get you:
Code:
FL=$(wc -l < inputfile)
while read
  do    case $REPLY in
        [tT]*)  CMD="NR>$((FL - ${REPLY:1}))";;
        [pP]*)  CMD="/${REPLY:1}/";;
        [fF]*)  CMD=1;;
            *)  echo "usage: CMD Param; CMD ~ t)ail, p)attern search, f)ull"
                continue
        esac

        ((++CNT))
        awk "$CMD" inputfile > /tmp/log.$CNT
  done


Last edited by RudiC; 09-13-2019 at 08:37 AM..
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