| -a |
append the users mentioned by -U option to the groupwithout removing existing user members
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| -g GID |
change the group ID to GID
# groupmod -g 600 group
change the GID of 'group' to 600
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| -n NEW_GROUP |
change the name to NEW_GROUP
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| -o |
allow to use a duplicate (non-unique) GID
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| -p PASSWORD |
change the password to this (encrypted) PASSWORD
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| -R CHROOT_DIR |
directory to chroot into
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| -P PREFIX_DIR |
prefix directory where are located the /etc/* files
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| -U USERS |
list of user members of this group
|