simpler, faster install your favorite PDF viewer; qpdfviewer, get PDF 'Advanced Bash Scripting' and a good else mkdir a space for scratch sudo chmod 777 . ke

simpler, faster install your favorite PDF viewer; qpdfviewer, get PDF 'Advanced Bash Scripting' and a good else mkdir a space for scratch sudo chmod 777 . keep running, opening viewer and reading the manual/tutorial doc side by side except if any referring to other dir. or sudo rm ... freely type, try every part of it the useful points with replacing,copying any outside dir. reference, into this scratch use find text menu in the viewer to quickly cross check / reference