DZone Snippets: files code

Search and replace keywords within many files

jrobertson (James Robertson) — Sat, 11 Oct 2008 21:48:21 GMT

# search and replace all text files in the temp directory replacing the word 'five' with 'six'

glob_path, exp_search, exp_replace = 'temp/*.txt','five', 'six'

Dir.glob(glob_path).each do |file| 

  buffer = File.new(file,'r').read.gsub(/#{exp_search}/,exp_replace)

  File.open(file,'w') {|fw| fw.write(buffer)}

end

output before:

more t*.txt
::::::::::::::
t1.txt
::::::::::::::
123 five 789
::::::::::::::
t2.txt
::::::::::::::
123 four 6789
::::::::::::::
t3.txt
::::::::::::::
123 ... five five four three

output after:

more t*.txt
::::::::::::::
t1.txt
::::::::::::::
123 six 789
::::::::::::::
t2.txt
::::::::::::::
123 four 6789
::::::::::::::
t3.txt
::::::::::::::
123 ... six six four three

Search and replace filenames using Ruby

jrobertson (James Robertson) — Sat, 11 Oct 2008 14:08:47 GMT

This script searches and replaces file names within a file directory.



#!/usr/bin/ruby

#file: bulkrenamefiles.rb



class BulkRenameFiles

  def initialize(h)

    h[:dir] = '.' if [:dir].empty?



    files = Dir.entries(h[:dir])



    files.each do |f|

      next if f == "." or f == ".."

      oldFile = h[:dir] + "/" + f

      newFile = h[:dir] + "/" + f.gsub(/#{h[:exp_search]}/,h[:exp_replace])

      File.rename(oldFile, newFile)

    end

  end

end



if __FILE__ == $0 then

  brf = BulkRenameFiles.new(:dir => '.', :exp_search => '^_', :exp_replace => '')

end

output before:

-rwxr-xr-x 1 apache apache  178 Aug  2 16:29 class_template.xml

-rwxr-xr-x 1 apache apache  106 Aug  2 16:29 _tasks_data_template.xml

-rwxr-xr-x 1 apache apache  100 Aug  2 19:31 _tasks_today.xml

-rwxr-xr-x 1 apache apache  909 Aug  2 19:31 _tasks.xsl

-rwxr-xr-x 1 apache apache  106 Aug  2 19:56 _tasks2_data.xml

-rw-r--r-- 1 apache apache  267 Aug  2 22:43 _tasks.xml

-rwxr-xr-x 1 apache apache   56 Aug  5 02:10 _tasks_template.xml

-rwxr-xr-x 1 apache apache 2686 Aug  8 19:53 index.xml

-rwxr-xr-x 1 apache apache 2685 Aug  8 19:53 _tasks_data.xml

output after:

-rwxr-xr-x 1 apache apache  106 Aug  2 16:29 tasks_data_template.xml

-rwxr-xr-x 1 apache apache  178 Aug  2 16:29 class_template.xml

-rwxr-xr-x 1 apache apache  100 Aug  2 19:31 tasks_today.xml

-rwxr-xr-x 1 apache apache  909 Aug  2 19:31 tasks.xsl

-rwxr-xr-x 1 apache apache  106 Aug  2 19:56 tasks2_data.xml

-rw-r--r-- 1 apache apache  267 Aug  2 22:43 tasks.xml

-rwxr-xr-x 1 apache apache   56 Aug  5 02:10 tasks_template.xml

-rwxr-xr-x 1 apache apache 2685 Aug  8 19:53 tasks_data.xml

-rwxr-xr-x 1 apache apache 2686 Aug  8 19:53 index.xml

Source: Renaming files using ruby! - by Ruby on Rails [rubyonrailsexamples.com]

*update: 12-Oct-08 @ 16:00 *

Here's a great one liner from rush [heroku.com]:

dir['*.jpg'].each { |f| f.rename f.name.gsub(/thumb-/, 'thumbnail_') }

List the 10 most recent files: Groovy version.

marcospereira (Marcos Silva Pereira) — Fri, 15 Aug 2008 05:16:03 GMT



def recents = new File(".").listFiles().findAll { it.file }.sort { it.lastModified() }.reverse()[0..9]

List the 10 most recent files

jrobertson (James Robertson) — Sun, 10 Aug 2008 14:13:15 GMT



 aimage_file = Dir.entries(".").select{|f| File.file? f }.sort_by { |f| File.mtime(f) }.reverse[0..9]

=> ["14_12_10GMT_1.jpg", "14_12_09GMT_1.jpg", "14_12_09GMT.jpg", "14_12_10GMT.jpg", "14_12_08GMT.jpg", "14_11_38GMT_1.jpg", "14_11_38GMT.jpg", "14_11_37GMT_1.jpg", "14_11_37GMT_2.jpg", "14_11_37GMT.jpg"]

References:
- Class: Dir [ruby-doc.org]
- Class: File [ruby-doc.org]

Toggle hidden files in Mac OS X Finder

Aupajo (Pete) — Thu, 31 Jul 2008 02:00:25 GMT

Works in Leopard, should work in all versions of OS X.



#!/bin/bash



if [ `defaults read com.apple.finder AppleShowAllFiles` == 1 ]

then 

  echo "Hiding hidden files."

  defaults write com.apple.finder AppleShowAllFiles -bool false

else 

  echo "Showing hidden files."

  defaults write com.apple.finder AppleShowAllFiles -bool true

fi   

     

KillAll Finder

Decompress several filetypes with a single script

zdenton (Zach Denton) — Fri, 18 Jul 2008 02:07:02 GMT

// Decompresses Z, gz, bz2, zip, rar, tar, and 7z with a single 'decompress' command



#!/bin/bash



# decompress - will decompress a file, regardless of compression type.



Z="compress -d"

gz="gunzip"

bz="bunzip2"

zip="unzip -qo"

rar="unrar x -id -y"

tar="tar xf"

7z="p7zip -d"



if [ $# -eq 0 ]; then

    echo "Usage: decompress file or files to decompress">&2

    exit 1

fi



for name

do

	if [ ! -f "$name" ] ; then

		echo "$0: file $name not found. Skipped." >&2

		continue

	fi



	if [ "$(echo $name | egrep '(\.Z$|\.gz$|\.bz2$|\.zip$|\.rar$|\.tar$|\.tgz$|\.7z$)')" = "" ] ; then

		echo "Skipped file ${name}: it's already decompressed." 

      		continue

	fi



	extension=${name##*.}



	case "$extension" in

		Z ) echo "Filetype is Z. Decompressing..."

		    $Z "$name"

		    ;;

		gz ) echo "Filetype is gz. Decompressing..."

		     $gz "$name"

		     ;;

		bz2 ) echo "Filetype is bz2. Decompressing..."

 		     $bz "$name"

		     ;;

		zip ) echo "Filetype is zip. Decompressing..."

		      $zip "$name"

		      ;;

		rar ) echo "Filetype is rar. Decompressing..."

		      $rar "$name"

		      ;;

		tar ) echo "Filetype is tar. Decompressing..."

              	      $tar "$name"

              	      ;;

		tgz ) echo "Filetype is tgz. Decompressing..."

              	      $tar "$name"

                     ;;

               7z ) echo "Filetype is 7z. Decompressing..."

                     $7z "$name"

	esac



done



exit 0

Listing the files and subdirectories in C - Linux

Tvrtko (Tvrtko) — Tue, 08 Jul 2008 01:13:50 GMT

// program lists the files and subdirectories within a given directory in full path



#include 

#include 

#include 

#include 



char *path_cat (const char *str1, char *str2);



int main () {

	struct dirent *dp;



        // enter existing path to directory below

	const char *dir_path="/path/to/directory/to/list";

	DIR *dir = opendir(dir_path);

	while ((dp=readdir(dir)) != NULL) {

		char *tmp;

		tmp = path_cat(dir_path, dp->d_name);

		printf("%s\n", tmp);

		free(tmp);

		tmp=NULL;

	}

	closedir(dir);

	return 0;

}



char *path_cat (const char *str1, char *str2) {

	size_t str1_len = strlen(str1);

	size_t str2_len = strlen(str2);

	char *result;

	result = malloc((str1_len+str2_len+1)*sizeof *result);

	strcpy (result,str1);

	int i,j;

	for(i=str1_len, j=0; ((i<(str1_len+str2_len)) && (j		result[i]=str2[j];

	}

	result[str1_len+str2_len]='\0';

	return result;

}

Linux - Change File/Directory Permissions Separately

k1mmeh (Kim Chirnside) — Mon, 02 Jun 2008 10:21:46 GMT

Change permission of all files or all directories separately from a set starting point.



// Directories:

find . -type d -exec chmod XXX {} \;



// Files:

find . -type f -exec chmod XXX {} \;

Open an arbitrary number of resources safely in ruby

tunah (Sam McCall) — Tue, 22 Apr 2008 00:44:04 GMT

I'm too lazy to work out what happens if I try filenames.map {|f| File.open(f) } and the thirteenth file doesnt exist, but I bet I don't like it.

module Enumerable

  # Example:

  # ['a','b'].with_files {|f,g| ... }

  # is the same as

  # File.open('a') {|f| File.open('b') {|g| ... } }

  # You can specify modes with

  # [['a', 'rb'], ['b', 'w']].with_files ...

  def with_files(

      meth = File.method(:open),

      offset=0,

      inplace=false,

      &block

  )

    if inplace then

      if offset >= length then

        yield self

      else

        fname,mode = *self[offset]

        File.open(fname,mode) {|f| 

          self[offset] = f

          self.with_files(meth,offset+1,true,&block)

        }

      end

    else

      dup.with_files(meth,offset,true,&block)

    end

  end

end

copy files using rsync and ssh

jrobertson (James Robertson) — Tue, 30 Oct 2007 13:03:36 GMT

source: http://www.mikerubel.org/computers/rsync_snapshots/#Abstract ; switches: -a = archive mode -e specifies the remote shell to use



rsync -a -e ssh source/ username@remotemachine.com:/path/to/destination/