For some reason or the other I had to do bulk operations on files, like prefix/postfix all lines or remove empty lines
, yeah I could do it with some unix command, but I am already using ruby to massage the data just wanted to extand that.So here
is what I did wrote a ruby script to do it now I can do stuff like
prefix ( ‘c:\tmp\zip.txt’,’some-prefix’ )
The script, hmmm I wonder if I could submit this to ruby people.
require 'fileutils'
module DevFileutils
include FileUtils::Verbose
# Opens a file and adds prefix to each line
def prefix file_name, prefix
temp = File.new(file_name+".tmp", 'a+')
IO.foreach(file_name) do |line|
temp.puts prefix + line
end
temp.close
mv file_name+'.tmp', file_name
end
# Opens a file and adds postfix to each line
def postfix file_name, postfix
temp = File.new(file_name+".tmp", 'a+')
IO.foreach(file_name) do |line|
temp.puts line.chomp + postfix
end
temp.close
mv file_name+'.tmp', file_name
end
#removes all empty lines from a file
def remove_empty_lines file_name
temp = File.new(file_name+".tmp", 'a+')
IO.foreach(file_name) do |line|
temp.puts line if !line.chomp.empty?
end
temp.close
mv file_name+'.tmp', file_name
end
def replace file_name,string,with_string
temp = File.new(file_name+".tmp", 'a+')
IO.foreach(file_name) do |line|
temp.puts line.gsub(string,with_string)
end
temp.close
mv file_name+'.tmp', file_name
end
end
Devender's Musings 
prefix:
sed ‘s/^.*$/prefix(&)/’ outputfile
suffix:
sed ‘s/^.*$/(&)suffix/’ outputfile
remove blank lines:
sed ‘/^$/ d’ outputfile
replace strings:
sed ‘s/old/new/’ outputfile
Damn, it ate all my redirects. Here is it again:
prefix:
sed ’s/^.*$/prefix(&)/’ < inputfile > outputfile
suffix:
sed ’s/^.*$/(&)suffix/’ < inputfile > outputfile
remove blank lines:
sed ‘/^$/ d’ < inputfile > outputfile
replace strings:
sed ’s/old/new/’ < inputfile > outputfile
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