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Full Discussion: Bash script to change user
Top Forums Shell Programming and Scripting Bash script to change user Post 303045687 by RudiC on Wednesday 8th of April 2020 02:30:06 PM
Old 04-08-2020
Originally Posted by vgersh99
you didn't provide the specific like OS, preferred shell etc...
just guessing - YMMV:

 read $user_name
if [ $(grep $user_name /etc/password) ]; then

Shouldn't that be
read user_name                            # no "$", no expansion
if grep $user_name /etc/passwd; then ...  # no "[" (test) command, no "command substitution" - use grep's exit code immediately

This User Gave Thanks to RudiC For This Post:

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OPIESU(1)						      General Commands Manual							 OPIESU(1)

opiesu - Replacement su(1) program that uses OPIE challenges SYNOPSIS
opiesu [ -f ] [ -c ] [ user_name ] DESCRIPTION
opiesu is a replacement for the su(1) program that issues OPIE challenges and uses OPIE responses. It is downward compatible with keysu(1) from the Bellcore S/Key Version 1 distribution and the su(1) program from the 4.3BSD Net/2 distribution. OPTIONS
-f If the invoked shell is csh(1), this option prevents it from reading the ``.cshrc'' file. (The [f] option may be passed as a shell argument after the login name, so this option is redundant and obsolescent.) -c Set console mode where the user is expected to have secure access to the system. In console mode, you will be asked to input your password directly instead of having to use an OPIE calculator. If you do not have secure access to the system (i.e., you are not on the system's console), you are volunteering your password to attackers by using this mode. user_name The name of the user to become. The default is root. EXAMPLE
wintermute$ opiesu kebe otp-md5 498 wi910502 (OTP response required) kebe's password: (echo on) kebe's password: RARE GLEN HUGH BOYD NECK MOLL wintermute# FILES
/etc/opiekeys database of information for OPIE system. SEE ALSO
su(1), opie(4), opiekey(1), opieinfo(1), opiesu(1), opielogin(1), opieftpd(8), opiekeys(5), opieaccess(5) AUTHOR
Bellcore's S/Key was written by Phil Karn, Neil M. Haller, and John S. Walden of Bellcore. OPIE was created at NRL by Randall Atkinson, Dan McDonald, and Craig Metz. S/Key is a trademark of Bell Communications Research (Bellcore). CONTACT
OPIE is discussed on the Bellcore "S/Key Users" mailing list. To join, send an email request to: skey-users-request@thumper.bellcore.com 7th Edition January 10, 1995 OPIESU(1)

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