chmod.sh

chomod 720 file_or_dir
# 1) 7 - owners rights
# 2) 2 - right for users who belongs to the owner's group
# 3) 0 - other users

# 4 - read
# 2 - write
# 1 - execute

chown.sh

# Change the owner of a file
# ls -lart tmpfile
-rw-r--r-- 1 himanshu family 0 2012-05-22 20:03 tmpfile
# chown root tmpfile
# ls -l tmpfile
-rw-r--r-- 1 root family 0 2012-05-22 20:03 tmpfile


# Change the group of a file
#ls -l tmpfile
-rw-r--r-- 1 himanshu family 0 2012-05-22 20:03 tmpfile
chown :friends tmpfile
#ls -l tmpfile
-rw-r--r-- 1 himanshu friends 0 2012-05-22 20:03 tmpfile


# Change both owner and the group
# ls -l tmpfile
-rw-r--r-- 1 root family 0 2012-05-22 20:03 tmpfile
# chown himanshu:friends tmpfile
# ls -l tmpfile
-rw-r--r-- 1 himanshu friends 0 2012-05-22 20:03 tmpfile