Small scripts

2005-10-11T21:24:00+00:00

First I wrote a Perl stdin-parsing oneliner yesterday for summing up the output from grep -c:

perl -e "my($sum) = 0; while(<STDIN>) { $sum += $1 if $_ =~ /^[^:]+:(\d+)$/ } print $sum;"

And while the syntax is still a bit weird to me I’m starting to like Perl a bit. Did I just say that? I blame the Perlisms in Ruby! At least it solves the problems it’s designed for in a good way.

I also needed a little script to replace all .html files on my old blog with a “I’ve moved” notice. So I wrote the little Python script below (I added some error checking today to make it easier to use). It’s super simple and hence a little embarrassing to post, but perhaps someone will need it some day (at least it will be easy for me to find). And that I wrote it in Python is a bit embarassing as well since I need to start using Ruby for these kinds of tasks.

Use at your own risk!

"""Replaces all files in a directory (and its subdirectories) with one file.
Usage: replacefiles.py SOURCEFILE DESTINATIONDIRECTORY"""

import sys, os.path, shutil

def replace_files_with_file(sourceFile, destinationDirectory, dryrun):
   os.path.walk(destinationDirectory, replace_directory, (dryrun, sourceFile))

def replace_directory(arg, dirname, names):
   dryrun, sourceFile = arg
   for name in names:
      name = os.path.join(dirname, name)
      if os.path.isdir(name):
         continue
      if dryrun:
         print "copy %(sourceFile)s %(name)s" % vars()
      else:
         shutil.copyfile(sourceFile, name)

def exit_print_help(help):
   print help
   sys.exit(-1)

if __name__ == '__main__':
   if len(sys.argv) != 3:
      exit_print_help(__doc__)
   script, source, destination = sys.argv
   if not (os.path.isfile(source) and os.path.isdir(destination)):
      exit_print_help(__doc__)
   print "First a dry run. The following would happen when replacing all files in '%(destination)s' with '%(source)s':" % vars()
   replace_files_with_file(source, destination, True)
   if raw_input("Are you sure you want to do the actions listed above? [y/n] ")[0].lower() == 'y':
      replace_files_with_file(source, destination, False)
      print "Done!"

andthennothing.net: Small scripts

Small scripts