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+'\" et
+.TH EVAL "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
+eval
+\(em construct command by concatenating arguments
+.SH SYNOPSIS
+.LP
+.nf
+eval \fB[\fIargument\fR...\fB]\fR
+.fi
+.SH DESCRIPTION
+The
+.IR eval
+utility shall construct a command by concatenating
+.IR argument s
+together, separating each with a
+<space>
+character.
+The constructed command shall be read and executed by the shell.
+.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"
+If there are no
+.IR argument s,
+or only null
+.IR argument s,
+.IR eval
+shall return a zero exit status; otherwise, it shall return the exit
+status of the command defined by the string of concatenated
+.IR argument s
+separated by
+<space>
+characters, or a non-zero exit status if the concatenation could not
+be parsed as a command and the shell is interactive (and therefore did
+not abort).
+.SH "CONSEQUENCES OF ERRORS"
+Default.
+.LP
+.IR "The following sections are informative."
+.SH "APPLICATION USAGE"
+Since
+.IR eval
+is not required to recognize the
+.BR \(dq--\(dq 
+end of options delimiter, in cases where the argument(s) to
+.IR eval
+might begin with
+.BR '-' 
+it is recommended that the first argument is prefixed by a string that
+will not alter the commands to be executed, such as a
+<space>
+character:
+.sp
+.RS 4
+.nf
+
+eval " $commands"
+.fi
+.P
+.RE
+.P
+or:
+.sp
+.RS 4
+.nf
+
+eval " $(some_command)"
+.fi
+.P
+.RE
+.SH EXAMPLES
+.LP
+.nf
+foo=10 x=foo
+y=\(aq$\(aq$x
+echo $y
+\fB$foo\fR
+eval y=\(aq$\(aq$x
+echo $y
+\fB10\fR
+.fi
+.SH "RATIONALE"
+This standard allows, but does not require,
+.IR eval
+to recognize
+.BR \(dq--\(dq .
+Although this means applications cannot use
+.BR \(dq--\(dq 
+to protect against options supported as an extension (or errors reported
+for unsupported options), the nature of the
+.IR eval
+utility is such that other means can be used to provide this protection
+(see APPLICATION USAGE above).
+.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 1003.1-2017, 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 .