Revision: 7672
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at August 5, 2008 23:00 by myjpa
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#!/usr/bin/env ruby #supress any warning when calling other shell commands. $VERBOSE = nil def die(msg) puts msg exit 1 end $cmd = ARGV.shift die "you should specify a string of ruby code to deal with eachline of STDIN" unless $cmd $in = STDIN.readlines $in.each do |x| x.chomp! eval($cmd) end
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This script is intended to use after the pipe '|' on unix shell. It execute a one-line ruby code(you can split multi-line ruby-code with ';', of course) iteratively on each-line from the STDIN, each-line of which is assigned to a variable x. eg. ls | eachline.rb '$no||=1;puts "#$no - #{x}";$no+=1' the output looks like this: 1 - README.image 2 - README.image~ 3 - bin 4 - boot ... Simple enough, isn't it?
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do sth. on eachline from STDIN
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Ruby