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Top Forums Shell Programming and Scripting Good (reliable!) check if user exists Post 302100382 by Corona688 on Tuesday 19th of December 2006 09:54:33 AM
Old 12-19-2006
Quote:
Originally Posted by inquirer
there are lots of ways on checking if aa user exist besides the passwd file. you can use the "id" or the "finger" command which are reliable commands.
I wouldn't call finger reliable, being considered an obsolete security hole which most systems no longer bother to install by default. id, on the other hand, is a useful looking thing which I didn't know about. Thanks!
 

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FINGER(1)						      General Commands Manual							 FINGER(1)

NAME
finger - user information lookup program SYNOPSIS
finger [ options ] name ... DESCRIPTION
By default finger lists the login name, full name, terminal name and write status (as a `*' before the terminal name if write permission is denied), idle time, login time, and office location and phone number (if they are known) for each current UNIX user. (Idle time is minutes if it is a single integer, hours and minutes if a ':' is present, or days and hours if a 'd' is present.) A longer format also exists and is used by finger whenever a list of people's names is given. (Account names as well as first and last names of users are accepted.) This format is multi-line, and includes all the information described above as well as the user's home directory and login shell, any plan which the person has placed in the file .plan in their home directory, and the project on which they are working from the file .project also in the home directory. Finger may be used to lookup users on a remote machine. The format is to specify the user as ``user@host.'' If the user name is left off, the standard format listing is provided on the remote machine. Finger options include: -m Match arguments only on user name. -l Force long output format. -p Suppress printing of the .plan files -s Force short output format. FILES
/etc/utmp who file /etc/passwd for users names, offices, ... /usr/adm/lastlog last login times ~/.plan plans ~/.project projects SEE ALSO
chfn(1), w(1), who(1). AUTHOR
Earl T. Cohen BUGS
Only the first line of the .project file is printed. There is no way to pass arguments to the remote machine as finger uses an internet standard port. 4th Berkeley Distribution May 10, 1986 FINGER(1)
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