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Full Discussion: If user input matches file contents
Top Forums UNIX for Dummies Questions & Answers If user input matches file contents Post 302759525 by DBnixUser on Tuesday 22nd of January 2013 12:28:01 PM
Old 01-22-2013
If user input matches file contents
I was wondering how I can read values from a file and then proceed if those values
match a user input. For example (a simple one), a user inputs their name, then we check if that name is in a file of usernames. If it is, it says proceed, if not, then it says you are not authorized.

Code:
userlist=`cat /home/user1/user_list.txt`
echo "Enter your username:"
read username
if [[ $username = $userlist ]];then
    echo "You may proceed"
else
   echo "You are not authorized"
exit
fi

userlist.txt:
Code:
bjames
jbryant

Last edited by Scrutinizer; 01-22-2013 at 02:08 PM.. Reason: code tags
 

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LEARN ABOUT XFREE86

userlist

USERLIST(8)						      Finger-type Userlisting						       USERLIST(8)

NAME
       userlist - Userlisting of who's on your system.

SYNOPSIS
       userlist

DESCRIPTION
       This  program simply gives you a listing of who is connected to your system.  It is used primarily in the sorted listing of cfingerd, which
       utilitizes the same method of display for a more uniform output between systems.  (It also made more sense to do it  this  way  instead	of
       having jumbled up display listings in sorted finger displays.  Besides, it made more sense to do this than use finger.  :)

       This program functions with the same types of things in mind that cfingerd does.  If the user has a .nofinger file, their username will not
       be displayed in the userlisting.

       Example output is shown as:

	Username Real Name	Idletime TTY Remote console
	username I'm real ...	9d 23:59   0 (remote.site.com)

       where it would display the user's login name, the user's real name, their idle time given in the format "dd hh:mm", their  TTY,	and  their
       remote location (or where they're telnetting from).

       If  the	username  is  over  8  characters, the program will not search for their information in the passwd file, since it may be too long.
       Besides, it checks getpwnam, anyway.  :)

OPTIONS
       -c     Give standard CFINGERD (custom) output.

       -n     List only people idle less than one day.

ADDITIONAL
       Although userlist is not required to run as suid root, it is a good idea.  The reason is it checks each users' directory  for  a  .nofinger
       file.  If indeed that user has a .nofinger file in his/her directory, that user will not be shown in the userlisting.

       If  you change the program to run as nobody.nobody, you are free to do so.  But you will also show the users if they are online, regardless
       of whether or not they have a ".nofinger" file (as long as their directory is NOT world-readable.)

CONTACTING
       If you like this program, have any suggestions on how it could be modified, or have bug reports, please write to: khollis@bitgate.com.

       Your continued Public Domain support is appreciated!  Thanks.

SEE ALSO
       cfingerd.conf(5), cfingerd(8), finger(1).

cfingerd 1.4.2							  29 August 1999						       USERLIST(8)
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