time

is there a command to fetch month name in unix

try any of these:

date '+%m'
date '+%b'
date '+%B'
date '+%h'

check the man page on date for details

both

date +%h

and

date +%b

give short month (e.g. Aug)

date +%B

gives the long name (e.g. August)
try "man date" for other options