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Old 10-21-2004, 10:14 PM   #1
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What is the use of chmod g+s?

Why is it not in the man pages of chmod?
Old 10-21-2004, 10:25 PM   #2
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It is, but not specific'ly...
The   format   of   a   symbolic   mode   is    ‘[ugoa...][[+-=][rwxXs-
tugo...]...][,...]’.   Multiple symbolic operations can be given, sepa-
rated by commas.

A combination of the letters ‘ugoa’ controls which users’ access to the
file  will  be  changed:  the  user who owns it (u), other users in the
file’s group (g), other users not in the file’s group (o), or all users
(a).   If  none of these are given, the effect is as if ‘a’ were given,
but bits that are set in the umask are not affected.

The operator ‘+’ causes the permissions selected to  be  added  to  the
existing  permissions  of each file; ‘-’ causes them to be removed; and
‘=’ causes them to be the only permissions that the file has.

The letters ‘rwxXstugo’ select the new  permissions  for  the  affected
users:  read  (r),  write (w), execute (or access for directories) (x),
execute only if the file is a directory or already has execute  permis-
sion  for  some user (X), set user or group ID on execution (s), sticky
(t), the permissions granted to the user who owns  the  file  (u),  the
permissions  granted to other users who are members of the file’s group
(g), and the permissions granted to users that are in  neither  of  the
two preceding categories (o).
Old 10-21-2004, 10:32 PM   #3
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For further extrapolation the sgid process you might want to look at:

Old 10-21-2004, 10:44 PM   #4
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Registered: Oct 2004
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chmod is a .....

chmod is a command used to change access permissions


the options g+s are as follows:

g - the permissions that other users in the file's group have for it

s - set user or group ID on execution


here is a sample usage:

chmod =rwx,g+s filename

(allow everyone to read, write, and execute a particular file and turn on the set group-ID)
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