I strongly recommend Rochkind - Advanced Unix Programming. Despite the title, it's not that advanced; the "advanced" here refers to system-level programming, n

I strongly recommend Rochkind - Advanced Unix Programming. Despite the title, it's not that advanced; the "advanced" here refers to system-level programming, not application. Note, for this you probably need to learn C. K&R ed2 remains an excellent book for this. Honorary mention - Kernighan and Pike - Unix Programming Environment. But it's a little dated. Above all, do. Get a Ubuntu or Centos image, install developer tools (gcc), manpages, and write some code.