In this article, we will cover the whoami
command.
As its name suggests, the whoami
command prints the user name of the effective user ID. In other words, it displays the name of the currently logged-in user.
How to Use the whoami
Command
The syntax for the whoami
command is as follows:
To display the name of the user who is currently logged on to the system, invoke the command without any options:
whoami
Output similar to the following will be displayed on the screen, showing the name of the user invoking the command:
linuxize
The whoami
command can be used in shell scripts to check the name of the user running the script.
Here is an example using an if
statement to compare the name of the user running the script with a given string.
if [[ "$(whoami)" != "any_name" ]]; then
echo "Only user 'any_name' can run this script."
exit 1
fi
If the user name does not match with the given string, the script will echo a message and exit.
The whoami
command is also is handy for verifying the name of the user after switching to another user with the su
command.
whoami
does not accept arguments. If you pass an argument, the command prints an error message:
whoami: extra operand ‘anything’
Try 'whoami --help' for more information.
The whoami
command accepts only two options:
-h
,--help
– Display a help message and exit.-V
,--version
– Shows the version information and exit.
Alternative Commands
Running the id
command with the -un
options produces the same output as running whoami
:
Use the id
command to obtain more information about a given user.
The $USER
environment variable contains the name of the logged-in user:
Conclusion
The whoami
command is a compound of the words “Who am I?” and prints the name of the user associated with the current effective user ID.
If you have any questions or feedback, feel free to leave a comment.