Answer / swapna

"chgrp" command is used to change groups.

Answer / rhino

"chgrp" -- is the command used to change the group of a
file . Only the owner of a file can change its group, and
can only change it to a group of which he is a member.

chgrp -R testgrp .

change the ownership of this directory to group 'testgrp'
and everything inside of it (-R = recursive). The person
issuing this command must own all the files or it will fail

Answer / lokesh210

U can use chown also,
chown user:group_that_owner_to_be_changed file_name

Answer / naveen kumar

"#groupmod" is the command to change the group.

Answer / shanthi

cd command is used to change the group

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