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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "COLON" 1P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" colon 
+.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 \- null utility
+.SH SYNOPSIS
+.LP
+\fB:\fP \fB[\fP\fIargument\fP \fB...\fP\fB]\fP
+.SH DESCRIPTION
+.LP
+This utility shall only expand command \fIargument\fPs. It is used
+when a command is needed, as in the \fBthen\fP condition of
+an \fBif\fP command, but nothing is to be done by the command.
+.SH OPTIONS
+.LP
+None.
+.SH OPERANDS
+.LP
+See the DESCRIPTION.
+.SH STDIN
+.LP
+Not used.
+.SH INPUT FILES
+.LP
+None.
+.SH ENVIRONMENT VARIABLES
+.LP
+None.
+.SH ASYNCHRONOUS EVENTS
+.LP
+Default.
+.SH STDOUT
+.LP
+Not used.
+.SH STDERR
+.LP
+The standard error shall be used only for diagnostic messages.
+.SH OUTPUT FILES
+.LP
+None.
+.SH EXTENDED DESCRIPTION
+.LP
+None.
+.SH EXIT STATUS
+.LP
+Zero.
+.SH CONSEQUENCES OF ERRORS
+.LP
+Default.
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+None.
+.SH EXAMPLES
+.sp
+.RS
+.nf
+
+\fB: ${X=abc}
+if     false
+then   :
+else   echo $X
+fi
+\fP\fBabc\fP
+.fi
+.RE
+.LP
+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
+.nf
+
+\fBx=y : > z
+\fP
+.fi
+.RE
+.LP
+which sets variable \fIx\fP to the value \fIy\fP (so that it persists
+after the null utility completes) and creates or
+truncates file \fBz\fP.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fISpecial Built-In Utilities\fP
+.SH 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 original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .