How do I rename a user name from ‘tom’ to ‘jerry’ under Ubuntu Linux?
How do I change my current login shell from bash to ksh under Linux or UNIX or Apple OS X operating systems?
ow do I count lines if given word or string matches for each input file under Linux or UNIX-like operating systems?
ow do I check the existing Linux / UNIX users and groups under Linux operating system?
How do I add a user to a group under Sun Solaris UNIX operating system from a shell prompt or command line?
an you explain me the format of /etc/group user group file under Linux / UNIX-like operating systems?
Can you explain /etc/shadow file format used under Linux or UNIX-like system?