"Electronic books." . . "REFERENCE General." . . "Unix and Shell programming" . . . . . "Unix & Shell programming" . "Unix & Shell programming"@en . . . . . . . . "Livres électroniques" . . . . . "Electronic books"@en . . . . . . "Unix and Shell programming"@en . "UNIX Shells." . . "UNIX Shells" . "UNIX (Computer file)" . . . .