Script to find & replace a multiple lines string across multiple php files and subdirectories Post: 302604196

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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 302604196 by agama on Saturday 3rd of March 2012 03:14:00 PM

03-03-2012

Registered User

Is the block of code the only block that starts <?php and finishes ?>? I suspect that maybe there are other blocks that start and end this way, but on the off chance that this will be the only block like this, then this sed should work:

Code:

sed '/<?php/,/?>/d'  "$file-" >"$file"

It deletes all lines between the starting line with "<?php" and the ending "?>" line as it reads the file. The updated file is written to $file.

If you can use this sed, just replace it in the earlier example.

If there are more than one php blocks of code, then you'll need to find a unique string inside the block that you want to delete. Change the one line in the script below that has "/enter your nickname/" to contain the unique string from the block of code and it should find and delete the lines containing the string.

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
    awk '     # read the file and delete the block of php code
    /<?php/ { drop = idx = 0; snarf = 1; }  # start of a block; start buffering

    /?>/ {                  # end of a block
        if( ! drop )        # magic string not found -- show this block
        {
            for( i = 0; i < idx; i++ )
                printf( "%s\n", buffer[i] );
            printf( "%s\n", $0 );
        }

        snarf = 0;          # turn off buffering
        next;
    }

    ### change the string between the slants to be something unique to the block you wish to delete. 
    /enter your nickname/ { drop = 1; }    # magic string found, drop if we are in a php block

    snarf {                 # if buffering, hold the record until end of block reached.
        buffer[idx++] = $0;
        next;
    }

    { print; }              # not buffering, just print the record.
    '  "$file-" >"$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

Hope this helps get you going.

Last edited by agama; 03-04-2012 at 01:44 PM.. Reason: corrected comment that introduced a bug

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setlinebuf

setbuffer(3C)						   Standard C Library Functions 					     setbuffer(3C)

NAME

       setbuffer, setlinebuf - assign buffering to a stream

SYNOPSIS

       #include <stdio.h>

       void setbuffer(FILE *iop, char *abuf, size_t asize);

       int setlinebuf(FILE *iop);

DESCRIPTION

       The  setbuffer()  and  setlinebuf()  functions  assign  buffering to a stream. The three types of buffering available are unbuffered, block
       buffered, and line buffered.  When an output stream is unbuffered, information appears on the destination file or terminal as soon as writ-
       ten;  when  it  is  block  buffered, many characters are saved and written as a block; when it is line buffered, characters are saved until
       either a NEWLINE is encountered or input is read from stdin. The fflush(3C) function may be used to force the block out early. Normally all
       files  are  block buffered. A buffer is obtained from malloc(3C) upon the first getc(3C) or putc(3C) performed on the file. If the standard
       stream stdout refers to a terminal, it is line buffered. The standard stream stderr is unbuffered by default.

       The setbuffer() function can be used after a stream iop has been opened but before it is read or written. It uses the character array  abuf
       whose  size  is	determined  by the asize argument instead of an automatically allocated buffer.  If abuf is the null pointer, input/output
       will be completely unbuffered.  A manifest constant BUFSIZ, defined in the <stdio.h> header, tells how large an array is needed:

	      char buf[BUFSIZ];

       The setlinebuf() function is used to change the buffering on a stream from block buffered or  unbuffered  to  line  buffered.  Unlike  set-
       buffer(), it can be used at any time that the stream iop is active.

       A  stream  can  be  changed  from  unbuffered  or  line buffered to block buffered by using freopen(3C). A stream can be changed from block
       buffered or line buffered to unbuffered by using freopen(3C) followed by setbuf(3C) with a buffer argument of NULL.

RETURN VALUES

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SEE ALSO

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NOTES

       A common source of error is allocating buffer space as an "automatic" variable in a code block, and then failing to close the stream in the
       same block.

SunOS 5.10							    13 May 1997 						     setbuffer(3C)