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Top Forums UNIX for Dummies Questions & Answers Expanding variables with Ed Bash 3.2.33 Post 302339885 by de_la_espada on Friday 31st of July 2009 03:58:26 PM
Old 07-31-2009
Expanding variables with Ed Bash 3.2.33

Hi,

The following code finds the line containing fruits in test.txt and replaces instances of apple with banana.

Code:
   ed -s test.txt <<< $'/fruits/s/apple/banana/g\nw'

What I want to do is put variables in the place of fruits, apple and banana.

I have tried replacing ' with " to get the variables to expand, but to no avail.

Code:
ed -s accounts.txt <<< $"/$account/s/$balance/$newBalance/g\nw"

Also
Code:
ed -s accounts.txt <<< $"/${account}/s/${balance}/${newBalance}/g\nw"

And trying to echo them, but still no luck.


I'm using GNU bash, version 3.2.33(1)-release (i386-redhat-linux-gnu)
 

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PRINT_R(3)								 1								PRINT_R(3)

print_r - Prints human-readable information about a variable

SYNOPSIS
mixed print_r (mixed $expression, [bool $return = false]) DESCRIPTION
print_r(3) displays information about a variable in a way that's readable by humans. print_r(3), var_dump(3) and var_export(3) will also show protected and private properties of objects with PHP 5. Static class members will not be shown. PARAMETERS
o $expression - The expression to be printed. o $return - If you would like to capture the output of print_r(3), use the $return parameter. When this parameter is set to TRUE, print_r(3) will return the information rather than print it. RETURN VALUES
If given a string, integer or float, the value itself will be printed. If given an array, values will be presented in a format that shows keys and elements. Similar notation is used for objects. When the $return parameter is TRUE, this function will return a string. Otherwise, the return value is TRUE. NOTES
Note When the $return parameter is used, this function uses internal output buffering so it cannot be used inside an ob_start(3) callback function. EXAMPLES
Example #1 print_r(3) example <pre> <?php $a = array ('a' => 'apple', 'b' => 'banana', 'c' => array ('x', 'y', 'z')); print_r ($a); ?> </pre> The above example will output: <pre> Array ( [a] => apple [b] => banana [c] => Array ( [0] => x [1] => y [2] => z ) ) </pre> Example #2 $return parameter example <?php $b = array ('m' => 'monkey', 'foo' => 'bar', 'x' => array ('x', 'y', 'z')); $results = print_r($b, true); // $results now contains output from print_r ?> SEE ALSO
ob_start(3), var_dump(3), var_export(3). PHP Documentation Group PRINT_R(3)
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