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purpose willbe, If you want to do some calculation on same variable which is used by parent shell and don't want to replace the value of parent shell variable.

head -c1000 inputfile > outputfile

When you open a file with vi a hidden swap-file is created (to recover your vi-session in case vi crashes). That file is deleted when you exit vi in a normal way. That deletion (and before that the...

man stat

stat yourfolder

echo "abc_ss_222_54.txt" | awk -F '.' '{print $NF}'

ls -1 /tmp/vinay/act/files | grep -E 'fdr_c_us_cons_*.[txt|done]'

From an excerption of man set:



For the sed command you can have a read of this:

Sed - An Introduction and Tutorial (http://www.grymoire.com/Unix/Sed.html#uh-4)

You can do something like:
#!/bin/bash

echo "Enter the file name to extract the timestamp"
read fname

set `echo "$fname"| sed 's/.*_\(.*\)_\(.*\)\..*/\1 \2/'`
echo $1
echo $2