logname

In computer software, logname (stands for Login Name) is a program in Unix and Unix-like operating systems that prints the name of the user executing the command. It corresponds to the LOGNAME variable in the system-state environment. The logname system call and command appeared for the first time in UNIX System III.

$ logname --help
Usage: logname [OPTION]
Print the name of the current user.

      --help     display this help and exit
      --version  output version information and exit

References

logname: return the user's login name – Shell and Utilities Reference, The Single UNIX Specification, Version 4 from The Open Group

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References