The Open Group Base Specifications Issue 6
IEEE Std 1003.1-2001
Copyright © 2001 The IEEE and The Open Group, All Rights reserved.
NAME
eval - construct command by concatenating arguments
SYNOPSIS
eval [argument ...]
DESCRIPTION
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.
OPTIONS
None.
OPERANDS
None.
STDIN
None.
INPUT FILES
None.
ENVIRONMENT VARIABLES
None.
ASYNCHRONOUS EVENTS
None.
STDOUT
None.
STDERR
None.
OUTPUT FILES
None.
EXTENDED DESCRIPTION
None.
EXIT STATUS
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.
CONSEQUENCES OF ERRORS
None.
The following sections are informative.
APPLICATION USAGE
None.
EXAMPLES
foo=10 x=foo
y='$'$x
echo $y
$fooeval y='$'$x
echo $y
10
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
Special Built-In Utilities
CHANGE HISTORY
None.
End of informative text.
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