Open a file or folder.
The open command opens a file (or a folder or URL), just as if you had double-clicked the file's icon.

      open [-a application] file ...

      open [-e] file ...

   -a     Specify the application to use for opening the file
   -e     Edit the file (with /Applications/TextEdit)

If no application name is specified, the default application as determined via LaunchServices is used to open the specified files.
You can specify one or more file names (or pathnames), which are interpreted relative to the shell or Terminal window's current working directory. e.g. open *.doc


Open the current terminal working directory
$ open .

Open demo.txt in the default application (as determined by LaunchServices).
$ open /Volumes/Macintosh HD/demo.txt
$ open file://localhost/Volumes/Macintosh HD/demo.txt

Open a folder in the Mac Finder.
$ open /Volumes/Macintosh HD/Applications/
$ open file://localhost/Volumes/Macintosh HD/Applications/

Open demo.txt with a specific application (in this case, TextEdit).
$ open -a /Applications/ /Volumes/Macintosh HD/demo.txt

Open a URL
$ open

Edit demo.txt (will open in TextEdit)
$ open -e /Volumes/Macintosh HD/foo.txt

“Clothes make the man. Naked people have little or no influence on society” ~ Mark Twain


open man page -
lesskey -
echo - Display message on screen
tee - Redirect output to multiple files
The less home page (Mark Nudelman)
Article: TA24770 - Clear the Finder "Open With" contextual menu (rename /Library/Preferences/

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