Simo Sorce wrote: > On Thu, 2007-06-14 at 10:44 -0400, Jarod Wilson wrote: >> # getent passwd | cut -d: -f1 | grep -c <user> >> >> # getent group | cut -d: -f1 | grep -c <group> > > It is advised to query the specific name required, the posix > specification allow for backends not to reply all or any of the accounts > in the db. But you have to replay if a specific user/group is requested. > > On very large environments (nis, ldap, winbindd) listing all the > accounts and then grepping out the one you need is a complete waste of > resources anyway and also a possibly very, very long operation. > > so the right method might be: > > getent passwd <user> >/dev/null > getent group <group> >/dev/null > > if the user/group exist then 0 is returned if not then non zero (2 iirc) > is returned That is indeed a superior way to go, and you're correct on the exit values. And 'getent' seems slightly more flexible than 'id' when it comes to finding out about groups, at least at a glance. -- Jarod Wilson jwilson@xxxxxxxxxx
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