man/cat1p/logname.1p.txt
|
logname(P) logname(P)
NAME logname - return the user's login name SYNOPSIS logname DESCRIPTION The logname utility shall write the user's login name to standard output. The login name shall be the string that would be returned by the getlogin() function defined in the System Interfaces volume of IEEE Std 1003.1-2001. Under the conditions where the getlogin() function would fail, the logname utility shall write a diagnostic mes- sage 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 shall affect the execution of logname: LANG Provide a default value for the internationaliza- tion variables that are unset or null. (See the Base Definitions volume of IEEE Std 1003.1-2001, Section 8.2, Internationalization Variables for the precedence of internationalization variables used to determine the values of locale cate- gories.) LC_ALL If set to a non-empty string value, override the values of all the other internationalization variables. LC_CTYPE Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte 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 mes- sages written to standard error. NLSPATH Determine the location of message catalogs for the processing of LC_MESSAGES . ASYNCHRONOUS EVENTS Default. STDOUT The logname utility output shall be a single line con- sisting of the user's login name: "%s\n", <login name> STDERR The standard error shall be used only for diagnostic messages. OUTPUT FILES None. EXTENDED DESCRIPTION None. EXIT STATUS The following exit values shall be returned: 0 Successful completion. >0 An error occurred. CONSEQUENCES OF ERRORS Default. The following sections are informative. APPLICATION USAGE The logname utility explicitly ignores the LOGNAME envi- ronment variable because environment changes could pro- duce erroneous results. EXAMPLES None. RATIONALE The passwd file is not listed as required because the implementation may have other means of mapping login names. FUTURE DIRECTIONS None. SEE ALSO id , who , the System Interfaces volume of IEEE Std 1003.1-2001, getlogin() COPYRIGHT Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operat- ing System Interface (POSIX), The Open Group Base Speci- fications Issue 6, Copyright (C) 2001-2003 by the Insti- tute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.open- group.org/unix/online.html . POSIX 2003 logname(P) |