Get available diskspace in ruby

1.use Sys::Filesystem.stat(dir) install:

gem install sys-filesystem

doc:

https://www.rubydoc.info/gems/sys-filesystem/1.1.4/Sys/Filesystem/Stat

example:

 def dir_usuage_percentage
   dir_stat = Sys::Filesystem.stat('/motion')
   dir_stat.bytes_used.to_f*100 / dir_stat.bytes_total.to_f
 end

2. usage percentage

spaceMb_i = `df -BM /dev/sdb1`.split[10].to_i
=> 49

free diskspace(G)

spaceGb_i = `df -BG /dev/sdb1`.split[9].to_i
=> 947

O