awk print last 5 characters of one line

$ cat test.list | awk '{print substr($1,length($1)-4, length($1))}'

from this link
http://www.unixcl.com/2008/05/print-last-2-characters-using-awk.html

Fix "^m" at the end of line

fix line endings in vi:

:set fileformat=unix

:wq

delete content of file1 from file2

grep -v -f file1 file2 > outfile

here outfile will have data other than file1 content

For exact match, use -Fx

grep -vFx -f file1 file2 > outfile

delete empty lines from file

$ sed  '/^\s*$/d'  lineno_tape.list

sort scientific number in linux

$ sort -g file.txt