I read about Dave Thomas Ruby one liners
Its says
# print section of file between two regular expressions, /foo/ and /bar/
$ ruby -ne '@found=true if $_ =~ /foo/; next unless @found; puts $_; exit if $_ =~ /bar/' < file.txt
May I know how i can use this is my Ruby code and not from command line?
According to ruby CLI reference,
-n assume 'while gets(); ... end' loop around your script
-e 'command' one line of script. Several -e's allowed. Omit [programfile]
So, just copy the code snippet to a ruby file enclosed in gets() loop
foobar.rb
while gets()
@found=true if $_ =~ /foo/
next unless @found
puts $_
exit if $_ =~ /bar/
end
And execute the file using
ruby foobar.rb < file.txt
You can also replace IO redirect by reading the file programmatically
file = File.new("file.txt", "r")
while (line = file.gets)
@found=true if line =~ /foo/
next unless @found
puts line
exit if line =~ /bar/
end
