Some environments do not use a
shadow file for maintaining passwords. These environments keep encrypted passwords in either a local
passwd file or one that is handled through NIS. I have seen this mode of operation in several versions of HP-UX and NIS. NIS can support using a
shadow file, but not all NIS clients have this capability.
The script in this chapter, which is intended to be run daily, creates and maintains a pseudo–
shadow file to track the age of user passwords and their change history. The script does not, however, remove the encrypted password from the already-existing
I intend this contrived
shadow-file generator to be run in conjunction with the password-aging script in Chapter 36. The ...