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am not sure, Is this what are you looking for ?
ls -l|awk '{ print "-"$8 }'

Try this :

awk -F " " '{ if( $1!="pattern" ) print $0 }' filename

Try this!!

cat abc|head -4|tail -2

Provide some more information about what exactly you want? I didn't get what your asking..

grep *.com
grep *.net
and so on..

ls -altr directory name

would do !!

Try this !!!

Code:

who|while read x ;
do
ps -u $x
done

You can also direct each o/p into separate files.

The above code not generating any output.Could you please suggest me ?

Thanks in advance