CODEWITHSUNDEEP
ruby
ccca
ccca

Reputation: 75

Ruby Executing Bash Commands on Linux

I am trying to write a ruby script to change my wireless mac address quickly by using "macchanger" tool.I have all the root permission to change it. And I try this:

  `ifconfig #{@wifi_device.getName()} down`
  output= `macchanger -m AA:BB:CC:DD:EE:FF #{@wifi_device.getName()}`
  `ifconfig #{@wifi_device.getName()} up`

It usually works well , however when there is a problem , for example I enter an invalid mac address, and the bash prints any error , I can not catch it from Ruby.It prints only success messages , not errors. When I tried an invalid mac , My question if there is any suggestion to get rid of executing bash commands and read the output properly.

Upvotes: 0

Views: 49

Answers (2)

slowjack2k
slowjack2k

Reputation: 2586

When you use this macchanger, then you don't need to call a shell command. You can put macchanger into your current folder and require_relative './macchanger' . After this you can use the class MacChanger

Upvotes: 2

Harmon Wood
Harmon Wood

Reputation: 2987

The shell needs to know where to send stderr. 2>&1 is a great way to do this it redirects 2(stderr) to 1(stdout) which is what "output" is capturing.

 output= `macchanger -m AA:BB:CC:DD:EE:FF #{@wifi_device.getName()} 2>&1`

The Advanced Bash Scripting Guide has a great chapter on I/O Redirection.

Upvotes: 1

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