Originální popis anglicky:
eval - construct command by concatenating arguments
Návod, kniha: POSIX Programmer's Manual
eval [argument ...]
The
eval utility shall construct a command by concatenating
arguments together, separating each with a <space>. The
constructed command shall be read and executed by the shell.
None.
See the DESCRIPTION.
Not used.
None.
None.
Default.
Not used.
The standard error shall be used only for diagnostic messages.
None.
None.
If there are no
arguments, or only null arguments,
eval shall
return a zero exit status; otherwise, it shall return the exit status of the
command defined by the string of concatenated
arguments separated by
<space>s.
Default.
The following sections are informative.
None.
foo=10 x=foo
y='$'$x
echo $y
$fooeval y='$'$x
echo $y
10
None.
None.
Special Built-In Utilities
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
.
