This is the command loggerposix that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
logger — log messages
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.
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> characters.
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 POSIX.1‐2008, Section 8.2,
Internationalization 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
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
Determine the locale that should be used to affect the format and contents of
diagnostic 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.
The standard error shall be used only for diagnostic messages.
The following exit values shall be returned:
0 Successful completion.
>0 An error occurred.
CONSEQUENCES OF ERRORS
The following sections are informative.
This utility allows logging of information for later use by a system administrator or
programmer 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.
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]
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
delivery mechanisms as they have historically been (and will probably continue to be) very
system-specific, as well as involving functionality clearly outside the scope of this
volume of POSIX.1‐2008.
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
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
POSIX.1‐2008. It is also arguable that they are, in fact, testable, but that the tests
themselves are not portable.
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