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+'\" et
+.TH COLON "1P" 2013 "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
+colon
+\(em null utility
+.SH SYNOPSIS
+.LP
+.nf
+: \fB[\fIargument\fR...\fB]\fR
+.fi
+.SH DESCRIPTION
+This utility shall only expand command
+.IR argument s.
+It is used when a command is needed, as in the
+.BR then
+condition of an
+.BR if
+command, but nothing is to be done by the command.
+.SH OPTIONS
+None.
+.SH OPERANDS
+See the DESCRIPTION.
+.SH STDIN
+Not used.
+.SH "INPUT FILES"
+None.
+.SH "ENVIRONMENT VARIABLES"
+None.
+.SH "ASYNCHRONOUS EVENTS"
+Default.
+.SH STDOUT
+Not used.
+.SH STDERR
+The standard error shall be used only for diagnostic messages.
+.SH "OUTPUT FILES"
+None.
+.SH "EXTENDED DESCRIPTION"
+None.
+.SH "EXIT STATUS"
+Zero.
+.SH "CONSEQUENCES OF ERRORS"
+Default.
+.LP
+.IR "The following sections are informative."
+.SH "APPLICATION USAGE"
+None.
+.SH EXAMPLES
+.LP
+.nf
+: ${X=abc}
+if false
+then :
+else echo $X
+fi
+\fBabc\fR
+.fi
+.P
+As with any of the special built-ins, the null utility can also have
+variable assignments and redirections associated with it, such as:
+.sp
+.RS 4
+.nf
+\fB
+x=y : > z
+.fi \fR
+.P
+.RE
+.P
+which sets variable
+.IR x
+to the value
+.IR y
+(so that it persists after the null utility completes) and creates or
+truncates file
+.BR z .
+.SH "RATIONALE"
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "Section 2.14" ", " "Special Built-In Utilities"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, Copyright (C) 2013 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .
+
+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 .