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Can you supply an example of your intended output? Unfortunately, "index" could have multiple meanings, so it's somewhat difficult to imagine what you'd like to see.

Also, are you only willing to...

bash-3.00$ cat compare.sh
#NOTE : 1.Filename must not have space for the script to work.
# 2.Script wont work if symlinks are there instead of proper filenames.

#!/bin/bash
#set -x
...

Well, the exec* family of functions never returns, so there's your first problem.

I'll start you off: use a single "=" for assignment; a double ("==") is for comparison. Also, you have an unmatched "esac".

For example (requires "find" with maxdepth option, and off the top of my head and untested, so no guarantees):

PATH1=/home/data1
PATH2=/home/data2
PATH3=/home/data3
PATH4=/home/data3 #should...

Without changing the way your program currently works, try:

PATH1=/home/data1
PATH2=/home/data2
PATH3=/home/data3
PATH4=/home/data3


for path in $PATH1 $PATH2 $PATH3 $PATH4; do
for i in...

Are they calling it as "lp <file>"? If so, and if you have Bash 3.0+, just place this earlier in the path than the real lp (or alias it, or... etc.):

#!/bin/bash

if [[ x"$1" =~ '.*\.cpp$' ]];...

I suspect that you missed the joke.

If you can provide specific information on the inputs you have and the outputs you'd like to get, I can be of significantly more assistance.

What is:
done < $user
intended to accomplish?

Without going too deeply into your code, let me just point you in the right direction: each "if" needs a "then" and a "fi", and each "while" needs...

Not clear why there's a colon at the start; is this vim? Here's how to do it in vim:
:%s/Mg\([24]\).\(q[np]s[b]?\) W=0\.175u/Mg\1.\2 W=wmg\1\2/g

Er... something like this:
if [ $(pidof httpd | awk '{print $2}') -gt 50 ]; then
echo Too many httpd processes.
fi
Again, if you have any actual input/output, we can help.

Always with the neat sed tricks! /me files that one away.

Thanks,
Dan

What are your inputs? How are they generated?

What are your (desired) outputs?

I'm working with a file like:
somestuff
somemorestuff
...
someadditionalstuff
STARTTAG
ENDTAG
someotherstuff
somecoolstuff
...
somefinalstuffI've got some text (either in a file or piped)...

Imagine someone is searching these forums. They want to put a "for" command in a script. They see a title, "How can I place a for statement..."; how does this help them know if that thread will be...

Because the teacher will give you an F? Why? Even if you're not root, you can always install Perl in your home directory.

Why is it important to do the cut?

Can you provide some sample input?

perl -ne 'if($.%2){$t=$_;} if(!$.%2){chomp;print "$_ $t";}' <file
Shortened that a bit for you.

Haven't had a chance to test it, but how about:

sed '/John/ {s/$/(Happy People)/;}'

/opt/scripts/do_arbitrary_and-or_poorly-specified_things.sh:
errpt -a
if [ $? -ne 0 ]; then
/opt/scripts/send_arbitrary_and-or_poorly-specified_emails.sh
fi

Just for fun, pure shell solution:
i=0
while read line
do if [ $(($i%2)) == 1 ]; then
echo "$line $lastline"
else
lastline=$line
fi
let i=$i+1
done

We cannot and will not help you until you provide the exact text of the commands and scripts you are using. My code works and does not insert extraneous backslashes. Without seeing your code, we...

/usr/lib/sendmail --help
/usr/lib/sendmail -h
man sendmail
info sendmail

Something like find . -type f | xargs df -s?

grep -B 1 "XXXX"?

Okay, given the amount of information you gave here, the following are all valid (in increasing order of absurdity):

Since you specified neither flexibility nor name format:
mv...