.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
.TH "EVAL" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
.\" eval 
.SH NAME
eval \- construct command by concatenating arguments
.SH SYNOPSIS
.LP
\fBeval\fP \fB[\fP\fIargument\fP \fB...\fP\fB]\fP
.SH DESCRIPTION
.LP
The \fIeval\fP utility shall construct a command by concatenating
\fIargument\fPs together, separating each with a
<space>. The constructed command shall be read and executed by the
shell.
.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
If there are no \fIargument\fPs, or only null arguments, \fIeval\fP
shall return a zero exit status; otherwise, it shall
return the exit status of the command defined by the string of concatenated
\fIargument\fPs separated by <space>s.
.SH CONSEQUENCES OF ERRORS
.LP
Default.
.LP
\fIThe following sections are informative.\fP
.SH APPLICATION USAGE
.LP
None.
.SH EXAMPLES
.sp
.RS
.nf

\fBfoo=10 x=foo
y='$'$x
echo $y
\fP\fB$foo\fP\fBeval y='$'$x
echo $y
\fP\fB10\fP
.fi
.RE
.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 .