change user name

hello...
Can i know how to change user name in linux?
Any command can change user name?
Also, if i change the user name, their mail and ftp account also will be changed?
thx everyone to reply
newexhshAsked:
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owensleftfootConnect With a Mentor Commented:
"usermod -d /home/newusername -m -l newusername username" (without the quotes) would change username to newusername and move the contents of /home/username to /home/newusername. You may still have to create a new mailbox in /var/spool/mail/ by the command "touch /var/spool/mail/newusername" and "chown newusername /var/spool/mail/newusername".
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jlevieCommented:
A change to a user name requires at least:

1) Edit of /etc/passwd, /etc/shadow, /etc/group, & /etc/gshadow

2) Rename /home/old-username /home/new-username

3) Rename of /var/spool/mail/old-username /var/spool/mail/new-username

Other changes may to aliases, virtusertable, Samba, etc may be required.

And yes, the mail and ftp account will typically change when you change the user name.
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owensleftfootCommented:
You can do this quite easily with the usermod command. The usermod command will alter all the system files which need to be changed. Have a look at "man usermode" from a command prompt (without the quotes).
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newexhshAuthor Commented:
Can you give me an example because i am new in linux
thx
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MercantilumCommented:
Just a few remarks:
- don't you have a GUI interface to do the changes, Yast2 or control center... ? (which linux?)
- in the manual editing case (1st answer) use "vipw"  and  "vipw -s" to edit passwd and shadows files - direct edition in some cases may lead to strange results...
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newexhshAuthor Commented:
hello, owensleftfoot
I can run your command sucessfully.
But in "chown that part"
i run
chown -R newusername newusername
and
chown -R newusername:newusername newusername
the group remains unchanged
how can i change it?
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owensleftfootCommented:
You can use "usermod -g newgroup" to change a users initial group.
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newexhshAuthor Commented:
oh....owensleftfoot
you help me alot, thx
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