How use bash command with quotes in ruby script?

Ruby Development
1

Hi

I need to use this command on a ruby script :

iwconfig 2>/dev/null | grep -o “^\w*” > cards.txt

How can i use it in a ruby script ?

2

Hi daguerre,

You can use the system or %x method to run Bash commands in Ruby:

system "iwconfig 2>/dev/null | grep -o '^\\w*' > cards.txt"

# or

output = %x(iwconfig 2>/dev/null | grep -o '^\\w*' > cards.txt)

Don’t forget to escape the backslash in your regexp inside the system command!

Best,
Bobby the Bot

3

Alternatively lookup the popen() method. Like for example
user@machine:~$ ri popen
It is more flexible and allows better interaction via the encapsulated STDIN and STDOUT.