The Single UNIX ® Specification, Version 2
Copyright © 1997 The Open Group
NAME
logname - return the user's login name
SYNOPSIS
logname
DESCRIPTION
The
logname
utility will write the user's login name to standard output.
The login name is
the string that would be returned by the XSH specification
getlogin()
function.
Under the conditions where the
getlogin()
function would fail, the
logname
utility will write a diagnostic message to standard error
and exit with a non-zero exit status.
OPTIONS
None.
OPERANDS
None.
STDIN
Not used.
INPUT FILES
None.
ENVIRONMENT VARIABLES
The following environment variables affect the execution of
logname:
- LANG
- Provide a default value for the internationalisation variables
that are unset or null.
If
LANG
is unset or null, the corresponding value from the
implementation-dependent default locale will be used.
If any of the internationalisation variables contains an invalid setting, the
utility will behave as if none of the variables had been defined.
- LC_ALL
-
If set to a non-empty string value,
override the values of all the other internationalisation variables.
- LC_CTYPE
-
Determine the
locale for the interpretation of sequences of bytes of text data as
characters (for example, single- as opposed to multi-byte characters
in arguments).
- LC_MESSAGES
-
Determine the locale that should be used to affect
the format and contents of diagnostic
messages written to standard error.
- NLSPATH
-
Determine the location of message catalogues
for the processing of
LC_MESSAGES .
ASYNCHRONOUS EVENTS
Default.
STDOUT
The
logname
utility output will be a single line consisting of the user's login name:
"%s\n", <login name>
STDERR
Used only for diagnostic messages.
OUTPUT FILES
None.
EXTENDED DESCRIPTION
None.
EXIT STATUS
The following exit values are returned:
- 0
- Successful completion.
- >0
- An error occurred.
CONSEQUENCES OF ERRORS
Default.
APPLICATION USAGE
The
logname
utility
explicitly ignores the
LOGNAME
environment variable because environment changes
could produce erroneous results.
EXAMPLES
None.
FUTURE DIRECTIONS
None.
SEE ALSO
id,
who.
UNIX ® is a registered Trademark of The Open Group.
Copyright © 1997 The Open Group
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