Ruby Executing Bash Commands on Linux

Question

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.

slowjack2k · Accepted Answer · 2016-08-12 13:50:08Z

2

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

answered Aug 12, 2016 at 13:50

slowjack2k

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2 Comments

ccca Over a year ago

Thank you for suggestion , I am gonna use it

Harmon Wood Over a year ago

Although this does not answer your question directly. This is a better programmatic solution to your application. Eliminating the need to do error redirect/checking by hand and offloading that onto the greater community.

Harmon Wood · Accepted Answer · 2016-08-12 13:50:00Z

1

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.

answered Aug 12, 2016 at 13:50

Harmon Wood

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1 Comment

Harmon Wood Over a year ago

I am glad I could help!

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