04-22-2002
Hugo's solution will work with sh, bash, and ksh. Are you using csh or tcsh? If so, switch the double quotes to single quotes.
With sh and friends...
echo "abc=\$(AA)"
With sh, ksh, bash, csh, and tcsh:
echo 'abc=$(AA)'
If you really can't get these to work, let us know what shell you're using and what result you get.
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LEARN ABOUT PHP
is_string
IS_STRING(3) 1 IS_STRING(3)
is_string - Find whether the type of a variable is string
SYNOPSIS
bool is_string (mixed $var)
DESCRIPTION
Finds whether the type given variable is string.
PARAMETERS
o $var
- The variable being evaluated.
RETURN VALUES
Returns TRUE if $var is of type string, FALSE otherwise.
EXAMPLES
Example #1
is_string(3) example
<?php
$values = array(false, true, null, 'abc', '23', 23, '23.5', 23.5, '', ' ', '0', 0);
foreach ($values as $value) {
echo "is_string(";
var_export($value);
echo ") = ";
echo var_dump(is_string($value));
}
?>
The above example will output:
is_string(false) = bool(false)
is_string(true) = bool(false)
is_string(NULL) = bool(false)
is_string('abc') = bool(true)
is_string('23') = bool(true)
is_string(23) = bool(false)
is_string('23.5') = bool(true)
is_string(23.5) = bool(false)
is_string('') = bool(true)
is_string(' ') = bool(true)
is_string('0') = bool(true)
is_string(0) = bool(false)
SEE ALSO
is_float(3), is_int(3), is_bool(3), is_object(3), is_array(3).
PHP Documentation Group IS_STRING(3)