When you are looking for a command, try using apropos.
before using "apropos" you must run "makewhatis".
makewhatis will create a db with the summary of all the man pages of your
system.
then you will be able to use "whatis" to display the sumary of a command
(not very usefull)
and use "apropos" to display all the commands for wich the sumary
contains a word
here is for example the result of "apropos password"
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conflict (8) - search for alias/password conflicts
crypt (3) - password and data encryption
fgetpwent (3) - get password file entry
getpass (3) - get a password
getpw (3) - Re-construct password line entry
getpwent, setpwent, endpwent (3) - get password file entry
getpwnam, getpwuid (3) - get password file entry
mkpasswd (1) - generate new password, optionally apply it to a
user
nwpasswd (1) - Change a user's password
passmass (1) - change password on multiple machines
passwd (5) - password file
passwd.nntp (5) - passwords for connecting to remote NNTP servers
putpwent (3) - write a password file entry
pwck (8) - verify integrity of password files
pwunconv (8) - restore old password file from shadow password
file
rpc.yppasswdd (8) - NIS password update server
shadow (3) - encrypted password file routines
shadow (5) - encrypted password file
vipw (8) - edit the password file
yppasswd, ypchfn, ypchsh (1) - NIS password update clients
xlock (1) - Locks the local X display until a password is
entered.
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