Sorry about the delayed response. Been working insane hours.

Try NextNumber=$(( NextNumber + 1 )) or ((NextNumber++)).

You may want to take a look at this thread: Increment integer using Shell...

I think you should take a quick look at this thread: Adding a new column in a text file (http://www.daniweb.com/forums/thread181214.html). It seems that they are requesting something very similar to...

You may want to include >nul 2>&1 at the end of the md as the script will undoubtedly list errors after creating the directory the first time.

Ex:
for /f "delims=." %%n in ('dir /b *.exe') do (md...

In reference to this comment:

Have you tried xargs? With maybe a loop that terminates at end of line/file? Just giving you another option.

I personally agree with Gromit about using PERL or...

Unfortunately, I need to rearrange the partitions on my laptop so that I can boot linux so I can't test your script out, but...

You might want to check out this for some tips on using the $RANDOM...

You were off to a good start.

Here what I did:

./first


./killdup
#!/bin/sh