xclip: expand page (#1494)

pages/linux/xclip.md

@@ -1,15 +1,32 @@
 # xclip
 
-> Copy STDIN to clipboard or print clipboard to STDOUT.
+> X11 clipboard manipulation tool, similar to `xsel`.
+> Handles the X primary and secondary selections, plus the system clipboard (`Ctrl + C`/`Ctrl + V`).
 
-- Copy output to clipboard:
+- Copy the output from a command to the X11 primary selection area (clipboard):
 
-`echo 123 | xclip -i`
+`echo 123 | xclip`
 
-- Copy output to system clipboard:
+- Copy the output from a command to a given X11 selection area:
+
+`echo 123 | xclip -selection {{primary|secondary|clipboard}}`
+
+- Copy the contents of a file to the system clipboard, using short notation:
 
 `echo 123 | xclip -sel clip`
 
-- Paste clipboard:
+- Copy the contents of a file into the system clipboard:
 
-`xclip -o > file.txt`
+`xclip -sel clip {{input_file.txt}}`
+
+- Paste the contents of the X11 primary selection area to the console:
+
+`xclip -o`
+
+- Paste the contents of the system clipboard to the console:
+
+`xclip -o -sel clip`
+
+- Paste the contents of the system clipboard into a file:
+
+`xclip -o -sel clip > {{output_file.txt}}`