passwd is a tool on most Unix and Unix-like operating systems used to change a user`s password. The password entered by the user is run through a key derivation function to create a hashed version of the new password, which is saved. Only the hashed version is stored; the entered password is not saved for security reasons. When the user logs on, ....
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In Linux computer systems passwd is an ASCII file that contains a list of the system's users and the passwords (in an encrypted format) they must use for access. The /etc/passwd file is comprised of lines, each containing a single entry. Each line has the format:
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Change password, see Section 2.2 and Section 4.1.6.
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