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Linux 2.6 - man page for logger (linux section 1posix)

LOGGER(P)			    POSIX Programmer's Manual				LOGGER(P)

NAME
       logger - log messages

SYNOPSIS
       logger string ...

DESCRIPTION
       The  logger  utility  saves a message, in an unspecified manner and format, containing the
       string operands provided by the user. The messages are expected to be evaluated	later  by
       personnel performing system administration tasks.

       It  is  implementation-defined  whether	messages  written in locales other than the POSIX
       locale are effective.

OPTIONS
       None.

OPERANDS
       The following operand shall be supported:

       string One of the string arguments whose contents are concatenated together, in the  order
	      specified, separated by single <space>s.

STDIN
       Not used.

INPUT FILES
       None.

ENVIRONMENT VARIABLES
       The following environment variables shall affect the execution of logger:

       LANG   Provide  a  default  value for the internationalization variables that are unset or
	      null. (See the Base Definitions volume of IEEE Std 1003.1-2001, Section 8.2, Inter-
	      nationalization Variables for the precedence of internationalization variables used
	      to determine the values of locale categories.)

       LC_ALL If set to a non-empty string value, override the values of all the  other  interna-
	      tionalization 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  argu-
	      ments).

       LC_MESSAGES
	      Determine the locale that should be used to affect the format and contents of diag-
	      nostic messages written to standard error.  (This means diagnostics from logger  to
	      the  user  or  application, not diagnostic messages that the user is sending to the
	      system administrator.)

       NLSPATH
	      Determine the location of message catalogs for the processing of LC_MESSAGES .

ASYNCHRONOUS EVENTS
       Default.

STDOUT
       Not used.

STDERR
       The standard error shall be used only for diagnostic messages.

OUTPUT FILES
       Unspecified.

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
       This utility allows logging of information for later use by a system administrator or pro-
       grammer	in  determining  why  non-interactive utilities have failed. The locations of the
       saved messages, their format, and retention period  are	all  unspecified.   There  is  no
       method for a conforming application to read messages, once written.

EXAMPLES
       A  batch  application,  running	non-interactively, tries to read a configuration file and
       fails; it may attempt to notify the system administrator with:

	      logger myname: unable to read file foo. [timestamp]

RATIONALE
       The standard developers believed strongly that some method of alerting  administrators  to
       errors  was  necessary. The obvious example is a batch utility, running non-interactively,
       that is unable to read its configuration files or that is unable to create  or  write  its
       results file. However, the standard developers did not wish to define the format or deliv-
       ery mechanisms as they have historically been (and will probably continue to be) very sys-
       tem-specific,  as well as involving functionality clearly outside the scope of this volume
       of IEEE Std 1003.1-2001.

       The text with LC_MESSAGES about diagnostic messages means diagnostics from logger  to  the
       user or application, not diagnostic messages that the user is sending to the system admin-
       istrator.

       Multiple string arguments are allowed, similar to echo, for ease-of-use.

       Like the utilities mailx and lp, logger is admittedly difficult	to  test.  This  was  not
       deemed	sufficient   justification  to	exclude  these	utilities  from  this  volume  of
       IEEE Std 1003.1-2001. It is also arguable that they are, in fact, testable, but	that  the
       tests themselves are not portable.

FUTURE DIRECTIONS
       None.

SEE ALSO
       lp , mailx , write()

COPYRIGHT
       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute 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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					LOGGER(P)


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