qmsg.1p (8114B)
- '\" et
- .TH QMSG "1P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
- .\"
- .SH PROLOG
- This manual page is part of the POSIX Programmer's Manual.
- The Linux implementation of this interface may differ (consult
- the corresponding Linux manual page for details of Linux behavior),
- or the interface may not be implemented on Linux.
- .\"
- .SH NAME
- qmsg
- \(em send message to batch jobs
- .SH SYNOPSIS
- .LP
- .nf
- qmsg \fB[\fR-EO\fB] \fImessage_string job_identifier\fR...
- .fi
- .SH DESCRIPTION
- To send a message to a batch job is to request that a server write a
- message string into one or more output files of the batch job. A
- message is sent to a batch job by a request to the batch server that
- manages the batch job. The
- .IR qmsg
- utility is a user-accessible batch client that requests the sending of
- messages to one or more batch jobs.
- .P
- The
- .IR qmsg
- utility shall write messages into the files of batch jobs by sending a
- .IR "Job Message Request"
- to the batch server that manages the batch job. The
- .IR qmsg
- utility shall not directly write the message into the files of the
- batch job.
- .P
- The
- .IR qmsg
- utility shall send a
- .IR "Job Message Request"
- for those batch jobs, and only those batch jobs, for which a batch
- .IR job_identifier
- is presented to the utility.
- .P
- The
- .IR qmsg
- utility shall send
- .IR "Job Message Request" s
- for batch jobs in the order in which their batch
- .IR job_identifier s
- are presented to the utility.
- .P
- If the
- .IR qmsg
- utility fails to process any batch
- .IR job_identifier
- successfully, the utility shall proceed to process the remaining batch
- .IR job_identifier s,
- if any.
- .P
- The
- .IR qmsg
- utility shall not exit before a
- .IR "Job Message Request"
- has been sent to the server that manages the batch job that corresponds
- to each successfully processed batch
- .IR job_identifier .
- .SH OPTIONS
- The
- .IR qmsg
- utility shall conform to the Base Definitions volume of POSIX.1\(hy2017,
- .IR "Section 12.2" ", " "Utility Syntax Guidelines".
- .P
- The following options shall be supported by the implementation:
- .IP "\fB\-E\fP" 10
- Specify that the message is written to the standard error of each batch
- job.
- .RS 10
- .P
- The
- .IR qmsg
- utility shall write the message into the standard error of the batch
- job.
- .RE
- .IP "\fB\-O\fP" 10
- Specify that the message is written to the standard output of each
- batch job.
- .RS 10
- .P
- The
- .IR qmsg
- utility shall write the message into the standard output of the batch
- job.
- .RE
- .P
- If neither the
- .BR \-O
- nor the
- .BR \-E
- option is presented to the
- .IR qmsg
- utility, the utility shall write the message into an
- implementation-defined file. The conformance document for the
- implementation shall describe the name and location of the
- implementation-defined file. If both the
- .BR \-O
- and the
- .BR \-E
- options are presented to the
- .IR qmsg
- utility, then the utility shall write the messages to both standard
- output and standard error.
- .SH OPERANDS
- The
- .IR qmsg
- utility shall accept a minimum of two operands,
- .IR message_string
- and one or more batch
- .IR job_identifier s.
- .P
- The
- .IR message_string
- operand shall be the string to be written to one or more output files
- of the batch job followed by a
- <newline>.
- If the string contains
- <blank>
- characters, then the application shall ensure that the string is
- quoted. The
- .IR message_string
- shall be encoded in the portable character set (see the Base Definitions volume of POSIX.1\(hy2017,
- .IR "Section 6.1" ", " "Portable Character Set").
- .P
- All remaining operands are batch
- .IR job_identifier s
- that conform to the syntax for a batch
- .IR job_identifier
- (see
- .IR "Section 3.3.1" ", " "Batch Job Identifier").
- .SH STDIN
- Not used.
- .SH "INPUT FILES"
- None.
- .SH "ENVIRONMENT VARIABLES"
- The following environment variables shall affect the execution of
- .IR qmsg :
- .IP "\fILANG\fP" 10
- Provide a default value for the internationalization variables that are
- unset or null. (See the Base Definitions volume of POSIX.1\(hy2017,
- .IR "Section 8.2" ", " "Internationalization Variables"
- the precedence of internationalization variables used to determine the
- values of locale categories.)
- .IP "\fILC_ALL\fP" 10
- If set to a non-empty string value, override the values of all the
- other internationalization variables.
- .IP "\fILC_CTYPE\fP" 10
- 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).
- .IP "\fILC_MESSAGES\fP" 10
- .br
- Determine the locale that should be used to affect the format and
- contents of diagnostic messages written to standard error.
- .IP "\fILOGNAME\fP" 10
- Determine the login name of the user.
- .SH "ASYNCHRONOUS EVENTS"
- Default.
- .SH STDOUT
- None.
- .SH STDERR
- The standard error shall be used only for diagnostic messages.
- .SH "OUTPUT FILES"
- None.
- .SH "EXTENDED DESCRIPTION"
- None.
- .SH "EXIT STATUS"
- The following exit values shall be returned:
- .IP "\00" 6
- Successful completion.
- .IP >0 6
- An error occurred.
- .SH "CONSEQUENCES OF ERRORS"
- In addition to the default behavior, the
- .IR qmsg
- utility shall not be required to write a diagnostic message to standard
- error when the error reply received from a batch server indicates that
- the batch
- .IR job_identifier
- does not exist on the server. Whether or not the
- .IR qmsg
- utility waits to output the diagnostic message while attempting to
- locate the job on other servers is implementation-defined.
- .LP
- .IR "The following sections are informative."
- .SH "APPLICATION USAGE"
- None.
- .SH EXAMPLES
- None.
- .SH RATIONALE
- The
- .IR qmsg
- utility allows users to write messages into the output files of running
- jobs. Users, including operators and administrators, have a number of
- occasions when they want to place messages in the output files of a
- batch job. For example, if a disk that is being used by a batch job is
- showing errors, the operator might note this in the standard error
- stream of the batch job.
- .P
- The options of the
- .IR qmsg
- utility provide users with the means of placing the message in the
- output stream of their choice. The default output stream for the
- message\(emif the user does not designate an output stream\(emis
- implementation-defined, since many implementations will provide, as
- an extension to this volume of POSIX.1\(hy2017, a log file that shows the history of utility
- execution.
- .P
- If users wish to send a message to a set of jobs that meet a selection
- criteria, the
- .IR qselect
- utility can be used to acquire the appropriate list of job
- identifiers.
- .P
- The
- .BR \-E
- option allows users to place the message in the standard error stream
- of the batch job.
- .P
- The
- .BR \-O
- option allows users to place the message in the standard output stream
- of the batch job.
- .P
- Historically, the
- .IR qmsg
- utility is an existing practice in the offerings of one or more
- implementors of an NQS-derived batch system. The utility has been found
- to be useful enough that it deserves to be included in this volume of POSIX.1\(hy2017.
- .SH "FUTURE DIRECTIONS"
- The
- .IR qmsg
- utility may be removed in a future version.
- .SH "SEE ALSO"
- .IR "Chapter 3" ", " "Batch Environment Services",
- .IR "\fIqselect\fR\^"
- .P
- The Base Definitions volume of POSIX.1\(hy2017,
- .IR "Section 6.1" ", " "Portable Character Set",
- .IR "Chapter 8" ", " "Environment Variables",
- .IR "Section 12.2" ", " "Utility Syntax Guidelines"
- .\"
- .SH COPYRIGHT
- Portions of this text are reprinted and reproduced in electronic form
- from IEEE Std 1003.1-2017, Standard for Information Technology
- -- Portable Operating System Interface (POSIX), The Open Group Base
- Specifications Issue 7, 2018 Edition,
- Copyright (C) 2018 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 original Standard can be obtained online at
- http://www.opengroup.org/unix/online.html .
- .PP
- Any typographical or formatting errors that appear
- in this page are most likely
- to have been introduced during the conversion of the source files to
- man page format. To report such errors, see
- https://www.kernel.org/doc/man-pages/reporting_bugs.html .