LOGNAME(1) General Commands Manual LOGNAME(1)

logname — return the user's login name

logname

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(3) function. Under the conditions where the getlogin(3) function would fail, the logname utility will write a diagnostic message to standard error and exit with a non-zero exit status.

None.

None.

Not used.

None.

The following environment variables affect the execution of logname :

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.
If set to a non-empty string value, override the values of all the other internationalisation variables.
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).
Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error.
Determine the location of message catalogues for the processing of LC_MESSAGES .

Default.

The logname utility output will be a single line consisting of the user's login name:

"%s\n", <login name>

Used only for diagnostic messages.

None.

None.

The following exit values are returned:

Successful completion.
An error occurred.

Default.

The logname utility explicitly ignores the LOGNAME environment variable because environment changes could produce erroneous results.

None.

None.

id(1) , who(1) .

February 1997 posix.fail