how to change password using usermod

[chakribobby]

hi
how to give an crypt password for "usermod -p" such that i can change the password for the given user
thanks in advance

[Hasan Atasoy]

hi ;

assume that you will change user user1 and password will be pass1

crypt pass1 | read newpass
usermod ${newpass} user1

or

usermod `crypt pass1` user1

Hasan.
please assign points.

[chakribobby]

i am unable to get the $ prompt after running the command
can you give me the correct syntax for that command

[Hasan Atasoy]

sorry;
I forgot to write -p option.


usermod -p `crypt pass1` user1


hASAN

[chakribobby]

now also i am unable to get the $ prompt of running the command i have to use ctrl+c to get
$ prompt
bash-3.2# usermod -p `crypt pass1` aa

[Kasper Hedensted]

I think that you need to use the "usermod.sam" file:

/usr/sam/lbin/usermod.sam -p "3dt14Ul7TWS.U" username


regards,
Kasper

[chakribobby]

how can i convert my password in to the encrypted formate

the key for encryption must match the key of the system?


if i use this
usermod -p with key 123> username

then the password for the user is changed

but when i used my
i am unable to log in

[A. Clay Stephenson · Accepted solution]

The crypt command will not work for this. The algorithm is different but the Perl crypt function will work. (Don't panic you don't have to know any Perl.)

#!/usr/bin/sh

typeset -i STAT=0

typeset SALT="Q9"
typeset PLAINTEXT="secret"
typeset HASH=$(perl -e "print crypt(${PLAINTEXT},${SALT})")
STAT=${?}
echo "Password Hash = \"${HASH}\""
exit ${STAT}

Note: With a little more effort you could use a randomly generated salt rather than the fixed "Q9" in this example. Man 3 crypt to understand what "salt" does.