command_utils
- Home: https://github.com/fornellas/command_utils/
- RubyGems.org: https://rubygems.org/gems/command_utils
- Documentation: http://www.rubydoc.info/gems/command_utils/
- Bugs: https://github.com/fornellas/command_utils/issues
Description
This gem provides a simple interface to execute external commands. You can capture both stdout / stderr, process it, and be safe that if command has not exited with 0, you will get an exception.
Install
gem install command_utils
This gem uses Semantic Versioning, so you should add to your .gemspec something like:
s.add_runtime_dependency 'command_utils', '~> 0.4', '>= 0.4.1'Examples
First, require it:
require 'command_utils'Read each line
command = 'echo -n stdout message ; echo -n stderr message 1>&2'
CommandUtils.each_line(command) do |stream, data|
puts "#{stream}: #{data}"
endSend output to logger
require 'logger'
command = 'echo -n stdout message ; echo -n stderr message 1>&2'
CommandUtils.logger_exec(
command,
logger: Logger.new(STDOUT),
stdout_level: :info,
stderr_level: :error,
stdout_prefix: 'This was output to stdout: ',
stderr_prefix: 'This was output to stderr: ',
)Raises unless 0 exit
command = 'echo -n stdout message ; echo -n stderr message 1>&2 ; exit 3'
begin
CommandUtils.each_output(command) do |stream, data|
puts "#{stream}: #{data}"
end
rescue
$stderr.puts "Raised #{$!.class}: #{$!}"
end