NAME

eval — construct command by concatenating arguments

SYNOPSIS

DESCRIPTION

The eval utility shall construct a command by concatenating argument s together, separating each with a <space>. The constructed command shall be read and executed by the shell.

OPTIONS

None.

OPERANDS

See the DESCRIPTION.

STDIN

Not used.

INPUT FILES

None.

ENVIRONMENT VARIABLES

None.

ASYNCHRONOUS EVENTS

Default.

STDOUT

Not used.

STDERR

The standard error shall be used only for diagnostic messages.

OUTPUT FILES

None.

EXTENDED DESCRIPTION

None.

EXIT STATUS

If there are no argument s, 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 argument s separated by <space>s.

CONSEQUENCES OF ERRORS

Default.

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

xcu_chap02(1)

CHANGE HISTORY

Issue 6

IEEE Std 1003.1-2001 (“POSIX.1”)/Cor 1-2002, item XCU/TC1/D6/5 is applied so that the reference page sections use terms as described in the Utility Description Defaults ( xcu_chap01(1) ). No change in behavior is intended.

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