Script to find & replace a multiple lines string across multiple php files and subdirectories Post: 302604153

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Top Forums Shell Programming and Scripting Script to find & replace a multiple lines string across multiple php files and subdirectories Post 302604153 by agama on Saturday 3rd of March 2012 11:07:47 AM

03-03-2012

Registered User

For starters, I'd rewrite the script you posted. The grep isn't needed, and since you're looking for a fixed set of files (*.php I assume), and fixed replace criteria, you don't need to worry about command line parameters. (You should if this is more than a one-off script, but I'll assume you don't need a script that you can run with different criteria.)

The basic script:

Code:

#!/usr/bin/env ksh

cd /directory/path/where/you/want/to/start
find . -name "*.php" | while read file
do
    echo "munging: $file"             # nice to see progress as it works
    mv "$file" "$file-"      # back it up

    ### insert sed or awk here ####  the sed in next line is for illustration only 
    sed 's/nosuchstringinthefile/noscuhreplacement/' "$file-" >"$file"
    if (( $? > 0 ))            # handle failure by putting the file back in place
    then
        echo "edit of $file failed" >&2
        mv "$file-" "$file"             # restore original
    else
        rm "$file-"               # worked, delete backup 
    fi
done

The tricky question is what criteria you need to determine which lines of the files to delete. Depending on what it is, the 'insert sed here' line in the previous script will need to change to do the right thing.

If your block of code is bounded by a unique string or phrase in the first and last lines then it will be a simple sed. The more complicated the criteria, the more complicated the code will need to be. Bottom line: post your criteria for deletion and someone will give you some help with writing a sed/awk or something that will delete things.

As for creating a script...
Start your favorite text editor, insert the code from above, or other of your choice, and save the file. Then at the command line, enter this command (assumes the file you saved was called delete_frm_php.ksh):

Code:

chmod 755 delete_frm_php.ksh

You then can invoke your script from the command line by typing delete_frm_php.ksh

agama

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LEARN ABOUT PHP

str_replace

STR_REPLACE(3)								 1							    STR_REPLACE(3)

str_replace - Replace all occurrences of the search string with the replacement string

SYNOPSIS

       mixed str_replace (mixed  $search, mixed  $replace, mixed  $subject, [int  &$count])

DESCRIPTION

	This function returns a string or an array with all occurrences of $search in $subject replaced with the given $replace value.

	If you don't need fancy replacing rules (like regular expressions), you should always use this function instead of preg_replace(3).

PARAMETERS

	If  $search and $replace are arrays, then str_replace(3) takes a value from each array and uses them to search and replace on $subject. If
       $replace has fewer values than $search, then an empty string is used for the rest of  replacement  values.  If  $search	is  an	array  and
       $replace is a string, then this replacement string is used for every value of $search. The converse would not make sense, though.

	If $search or $replace are arrays, their elements are processed first to last.

	      o $search
		- The value being searched for, otherwise known as the needle. An array may be used to designate multiple needles.

	      o $replace
		- The replacement value that replaces found $search values. An array may be used to designate multiple replacements.

	      o $subject
		-  The	string or array being searched and replaced on, otherwise known as the haystack.  If $subject is an array, then the search
		and replace is performed with every entry of $subject, and the return value is an array as well.

	      o $count
		- If passed, this will be set to the number of replacements performed.

RETURN VALUES

	This function returns a string or an array with the replaced values.

EXAMPLES

       Example #1

	      Basic str_replace(3) examples

	      <?php
	      // Provides: <body text='black'>
	      $bodytag = str_replace("%body%", "black", "<body text='%body%'>");

	      // Provides: Hll Wrld f PHP
	      $vowels = array("a", "e", "i", "o", "u", "A", "E", "I", "O", "U");
	      $onlyconsonants = str_replace($vowels, "", "Hello World of PHP");

	      // Provides: You should eat pizza, beer, and ice cream every day
	      $phrase  = "You should eat fruits, vegetables, and fiber every day.";
	      $healthy = array("fruits", "vegetables", "fiber");
	      $yummy   = array("pizza", "beer", "ice cream");

	      $newphrase = str_replace($healthy, $yummy, $phrase);

	      // Provides: 2
	      $str = str_replace("ll", "", "good golly miss molly!", $count);
	      echo $count;
	      ?>

       Example #2

	      Examples of potential str_replace(3) gotchas

	      <?php
	      // Order of replacement
	      $str     = "Line 1
Line 2
Line 3
Line 4
";
	      $order   = array("
", "
", "
");
	      $replace = '<br />';

	      // Processes 
's first so they aren't converted twice.
	      $newstr = str_replace($order, $replace, $str);

	      // Outputs F because A is replaced with B, then B is replaced with C, and so on...
	      // Finally E is replaced with F, because of left to right replacements.
	      $search  = array('A', 'B', 'C', 'D', 'E');
	      $replace = array('B', 'C', 'D', 'E', 'F');
	      $subject = 'A';
	      echo str_replace($search, $replace, $subject);

	      // Outputs: apearpearle pear
	      // For the same reason mentioned above
	      $letters = array('a', 'p');
	      $fruit   = array('apple', 'pear');
	      $text    = 'a p';
	      $output  = str_replace($letters, $fruit, $text);
	      echo $output;
	      ?>

NOTES

       Note

	      This function is binary-safe.

       Caution

	      Replacement order gotcha

	       Because str_replace(3) replaces left to right, it might replace a previously inserted value when doing multiple	replacements.  See
	      also the examples in this document.

       Note

	       This function is case-sensitive. Use str_ireplace(3) for case-insensitive replace.

SEE ALSO

       str_ireplace(3), substr_replace(3), preg_replace(3), strtr(3).

PHP Documentation Group 													    STR_REPLACE(3)