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##   WEB DEVELOPMENT HELPERS
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#### REMOVING BINARY CHARACTERS

# Binary characters do NOT belong in a webpage.  
# In some cases, they may screw up HTML rendering
# Otherwise, they may make it difficult to run maintenance scripts against them
# So binary characters should be removed first, before using other maintenance tools

dos2unix is very helpful.  
It converts files in place from windows carriage returns to unix carriage returns. 
but it does NOT always work.  If the file contains other binary characters, for example.
But dos2unix is STILL helpful then because in its error, it will identify the line number and binary character that it first encounters.

dos2unix filename.html
or
dos2unix *

If you have identified a file with "null" characters:
sed -i 's/\x0//g' filename.html
or
sed -i 's/\x0//g' *

Where are the hat-ems (^M)?
 grep -c "^M" * |grep -v :0
  (seee how to create ^M below)

replace hat-em with normal carriage return

perl -i -pe 's/^M/\n/g' filename.html
or
perl -i -pe 's/^M/\n/g' *

In order to create that "hat-em" character you will need to use:
    control-V control-m
    or
    control-v and then m

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#### PERMISSIONS FOR WEBPAGES

* This may differ according to your host
For static webpages, you MAY be able to use rw-r--r--
that is:  read-write for root, and read for group and world
     chmod 644 filename.html
          or 
     chmod 644 *
        If this doesn't work on YOUR HOST, use the scripting set up below.

For webpages with pieces of script in them, you will need:  rwxr-xr-x
that is:  read-write-execute for root, and read-execute for group and world
      chmod 755 filename.html
           or
      chmod 755 *

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#### BATCH RENAMING

If you have run a script and now you have a bunch of files with an extension that 
needs to be changed to the original filename...  After moving your originals to a safe place,
run this command:

# rename files from <filename>.original to <filename>
perl -e 'while(<*.original>){$_=~/(.*)\.original/; rename$_,$1}'


#### BATCH STRING SUBSTITUTION

perl -i -pe 's/panel1.html/panel2.html/g' *

CHANGING A STRING in MULTIPLE TEXT FILES IN DIRECTORY
For all files in this directory, change internal variable $REPLACEMENT to $REPLACEMENT
ALSO rename the original files to <filename>.original

perl -i.original -pe 's/\$REPLACEMENT/\$REPLACEMENT/g' *

Same as above but without retaining the original files:

perl -i -pe 's/\$REPLACEMENT/\$REPLACMENT/g' *

The -p means to enclose your Perl program in a print loop that looks SOMEWHAT like this:

while ($_ = <>) {
    <Your Perl one liner>
    print "$_";
}