File extensions (.jpg, .txt, .pdf, etc) are normally hidden by default in OS X. You can either set all extensions to be displayed through the following command:
Use plain text as default format in TextEdit
TextEdit is a simple application for quickly writing text and notes. The text can be edited in RTF (Rich Text Format) mode, as well as plain text. With the following defaults write command you can enable plain text as default format in TextEdit.
Make OS X screenshots without window shadows
10 terminal commands to speed up macOS Sierra on your Mac
Most improvements in macOS Sierra are not immediately visible to the ordinary macOS user. Especially under the hood many improvements have been made in the area of performance and safety. Some users experience a slow Mac after installing MacOS sierra
With the following 10 Terminal Commands you can speed up macOS Sierra. The commands disable various delays and animations from that standard built by Apple. These are nice, but not necessary for the Mac