How to send commands to the ruby interpreter from a Shell Script?

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How to send commands to the ruby interpreter from a Shell Script?

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#1 by (1 votes)
#2 by (1 votes)

1

This is more out of curiosity ... I've seen some examples of what I want to do, but in Perl. I tried to find a way to do the same in ruby, but to no avail.

I want a function to generate an MD5 hash from a word passed as an argument. The intent is to send this argument to the ruby interpreter, and then use the return in function. I made a "pseudo-code" to illustrate what I want:

function generate_hash {
  # Enviar o argumento para o interpretador e obter o retorno.
  ruby "Digest::MD5.hexdigest($1)"
}

Does anyone have any idea how I could do this integration?

ruby bash shell-script terminal

asked by anonymous 04.07.2016 / 04:03

2 answers

1

A great way is to use I / O to send the data. In bash :

generate_hash() {
  ruby -r digest/md5 -e 'puts Digest::MD5.hexdigest STDIN.read'
}

echo 'argumento' | generate_hash
generate_hash < arquivo

11.07.2016 / 04:11

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score 1 · Accepted Answer

To execute a direct command in the Ruby interpreter use -e, in short your example would be:

#!/bin/bash
function generate_hash {
  # Enviar o argumento para o interpretador e obter o retorno.
  ruby -e "require 'digest/md5';puts Digest::MD5.hexdigest('$1')"
}
generate_hash $1

Result:

⟩ ./test.sh a
0cc175b9c0f1b6a831c399e269772661