rb - a versatile command line utility

Not spending all day in the terminal processing files or sorting data, but this seems like something I would like to be ubiquitous :)

#!/usr/bin/env ruby
File.join(Dir.home, '.rbrc').tap { |f| load f if File.exists?(f) }

def execute(_, code)
  puts _.instance_eval(&code)
rescue Errno::EPIPE
  exit
end

single_line = ARGV.delete('-l')
code = eval("Proc.new { #{ARGV.join(' ')} }")
single_line ? STDIN.each { |l| execute(l.chomp, code) } : execute(STDIN.each_line, code)

Euh, yes, that is the actual code, which enables you to do things like:

Sort df -h output by Use%

> df -h | rb 'drop(1).sort_by { |l| l.split[-2].to_f }'

# udev                         3,9G     0  3,9G   0% /dev
# tmpfs                        3,9G     0  3,9G   0% /sys/fs/cgroup
# /dev/sda1                    511M  3,4M  508M   1% /boot/efi
# /dev/sda2                    237M   85M  140M  38% /boot

# or leave the header if you want
> df -h | rb '[first].concat drop(1).sort_by { |l| l.split[-2].to_f }'

# Filesystem                   Size  Used Avail Use% Mounted on
# udev                         3,9G     0  3,9G   0% /dev
# tmpfs                        3,9G     0  3,9G   0% /sys/fs/cgroup
# /dev/sda1                    511M  3,4M  508M   1% /boot/efi
# /dev/sda2                    237M   85M  140M  38% /boot

Well, read more on it at the rb github page.