we use in windows

what is it's equivalent in linux..

Please help.
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well to be exact 'whoami' is a command.
If you want exactly the same thing you have above (a system veriable which holds the current  username) then it would be

echo $USER

(note the capital letters)
jcob_lAuthor Commented:
[root@server2 dbs]# echo $USER
[root@server2 dbs]#
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yes.  See the word 'root' at the start of lines 1 and 2.... thats your username.
See the '#' at the end of those lines.... that also means you are 'root'
root is your username.

Is that not what you want ?
if you started as a different user and then did 'su' or 'sudo' to become root
and you want to know what is the username beneath root
then you could use the command
or to get it as a variable you can echo, you could do something like :

echo "Your name is `logname` "

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Not related (i.e. please no assist for this), but if you're new to Linux something you should be aware of... the more stuff you do at root level, the more ownerships and permissions will get tied to it until eventually your setup won't run withOUT using 'su -' for root (most distros by default no longer allow "logging in" as root for just that reason).

So it's much better to do 'su' + root password, or put the user in the /etc/sudoers file and use 'sudo' + user password (as edster9999 mentioned in http:#a39526099).
Check $PS1

answer is there itself.
jcob_lAuthor Commented:
yes that is correct with sudo.
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