1 files changed, 28 insertions, 0 deletions
diff --git a/select-from b/select-from
new file mode 100755
index 0000000..7ab40e7
--- /dev/null
+++ b/select-from
@@ -0,0 +1,28 @@
+#!/usr/bin/env ruby
+
+require 'trollop'
+require 'zipf'
+
+opts = Trollop::options do
+  banner "select_from [--invert] -i <file> < <line separated data>"
+  opt :index,  "Line numbers to output.", :required => true
+  opt :invert, "Invert selection.", :type => :bool, :short => '-j', :default => false
+end
+
+accept = {}
+
+f = ReadFile.new ARGV[0]
+f.readlines_strip.each { |line|
+  accept[line.strip.to_i] = true
+}
+
+i = 0
+while line = STDIN.gets
+  if accept[i] && !opts[:invert]
+    STDOUT.write line
+  elsif !accept[i] && opts[:invert]
+    STDOUT.write line
+  end
+  i += 1
+end
+