Temporarily changing default gid
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newgrp command
To "log-in" to a secondary group and, as a result, changing your default gid that is used to create files, use the newgrp command:
# newgrp web
sg command
To perform a command as a secondary group, use the sg [-] <group> -c "<command>" (similar to using sudo or su -c:
# sg - web -c "touch index.html"
id command
To list your secondary groups, use the id command:
# id uid=500(belmin) gid=150(web) groups=10(wheel),150(web),160(ftp),500(belmin)
(Note: Changed the gid numbers and group names for security.)
