How to change user password on Linux/Solaris and also see password policy

1. Password change and password policy on Linux

a. To change the user pw, at the prompt, use password command followed by user id.
# passwd bhusal # you have to enter password twice.

b. force password change upon first login,
# chage -d 0 bhusal # -d is for days, so 0 (zero) means today, right now.

c. Check the following files for passowrd policies.

# more /etc/login.defs # for Password aging info
# more /etc/pam.d/system-auth # for pw length, case info.

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2. Password change and password policy on Solaris.

a. To change the pw, use the passwd command followed by userid
# passwd bhusal

b. Force the password upon first login.
# passwd -f bhusal # -f will force password to change upon first login.

c. For password policy, check the following two files,

/etc/default/login
/etc/default/passwd

d. If there is an issue with login, you can also check the following files,

/etc/passwd
/etc/shadow (account locked?)

e. Also check,
/etc/ssh/sshd-config
/etc/ssh/ssh-config