DAY1. 1.i couldnt install xcode, appstore says i need osx 10.12.6 or later version. 2.we can open atom from terminal entering atom . 3..rb 4.CMD+/ or tree-view:toggle
6.pwd stands for present working directory . 7.ls lists the files in current folder. cd is to move to other directory.mkdir is to make a new directory. 8.local 9.see comments