Verify whether a hash generated with htpasswd matches a password

README

% htpasswd -nb foo bar >passwd
% ./chkpasswd.exp passwd foo bar
% echo "$?"
# 0 = match, 1 = no match

chkpasswd.exp

#!/usr/bin/env expect
log_user 0
set file [lindex $argv 0]
set user [lindex $argv 1]
set password [lindex $argv 2]
spawn htpasswd -v $file $user
expect "Enter password: "
send "$password\r"
expect "Password for user $user correct." { exit 0 }
exit 1