topic Re: shell script help in Operating System - HP-UX

shell script help

Zee — Tue, 07 Dec 2004 10:53:16 GMT

cat $scriptpath/synclogs.log | while read LINE
do
case $LINE in
.............

...........
......

Quesiton:: is there anyway of finding out the line i m reading in $LINE variable is the last line in the file ?

Any help?

Re: shell script help

Fred Ruffet — Tue, 07 Dec 2004 10:56:29 GMT

With something like that :

lineCount=$(wc -l $scriptpath/synclogs.log)
lineNumber=0
cat $scriptpath/synclogs.log | while read LINE
do
lineNumber=$(($lineNumber+1))
if [ $lineNumber -eq $lineCount] ; then
echo Last one
fi
case $LINE in
.............

...........
......
done

Regards,

Fred

Re: shell script help

Rodney Hills — Tue, 07 Dec 2004 10:57:05 GMT

You could set a variable to the line count at the begining of the script.

nrec=`wc -l synclogs.log`

Then count up each record.

HTH

-- Rod Hills

Re: shell script help

G. Vrijhoeven — Tue, 07 Dec 2004 11:00:14 GMT

Hi Zee,

I would do something like a
LIN=`cat file | wc -l `
NUM=0
cat file | while read LINE
do
let NUM="$NUM ++1"
case $LINE in
...
if [ $NUM -eq $LIN ]
then
exit 0
fi
done

Re: shell script help

Patrick Wallek — Tue, 07 Dec 2004 11:02:04 GMT

You could try something like:

Before the cat statement do:

LASTLINE=$(tail -1 $scriptpath/synclogs.log)

Then in your 'while do' loop:

if [[ "${LINE}" = "${LASTLINE}" ]] ; then
...do what you wanna do...
else
...do something else...
fi

The above works on the assumption that each line is somehow unique, which could be a problem if it's a log file.

Re: shell script help

Zee — Tue, 07 Dec 2004 11:10:55 GMT

Thanks, is there any thing called EOF? can EOF be used for checking last line in the file ?

Re: shell script help

Rodney Hills — Tue, 07 Dec 2004 11:13:00 GMT

Since you are reading through "pipes", their is no way for the system to look ahead and see if the next line is EOF.

-- Rod Hills

Re: shell script help

Zee — Tue, 07 Dec 2004 11:18:30 GMT

thanks Rodney,

can u suggest any other way of reading line other than "pipe" and then used EOF marker to check last line ?

any suggestion ?

Re: shell script help

John Poff — Tue, 07 Dec 2004 11:22:41 GMT

Hi,

I'm curious. What problem are you trying to solve? Using the while-read-do-done structure will read each line of the file, and the statements in your script immediately after the done line will be executed after the last line of the file is read, so you should be able to handle whatever you need to do after the end of file at that point.

JP

Re: shell script help

Zee — Mon, 21 Feb 2005 07:18:07 GMT

thanx