hai friends i have deleted passwd command using rm command i thought it will come again at the time of rebooting but it is completely deleted how to get it worked again

I think that the passwd program is in /bin on Linux, so restore the /bin/passwd file from backups just as you would any other file. And be careful when you are acting as root. If you accidentally delete a very critical file you might not be able to run the restore program. In the worst case you will need to re-install the OS. But /bin/passwd should not be needed during the restore, so you should be ok.

i have deleted it when i was working in root now if want to get it again how it is possible i already used cp command to copy it from etc directory but it is not working

/etc/passwd is the password database file - /bin/passwd is a binary executable used for changing passwords (amongst other things) - the two are not the same.

As Perderabo suggests, you need to restore /bin/passwd (or /usr/bin/passwd on some Linuxes) from a backup.

Cheers
ZB

hello venkata.ganesh,

just get your rescue/installation CD,
go to rescue mode,
install the passwd file.

cheers.