xcreep is an easy wrapper for xclip made in Go.

Simply

go get github.com/gmelodie/xcreep

1. Copy the contents of a file, say example.txt, to the clipboard:

./xcreep example.txt

2. Paste it wherever you want with CTRL+V or Right-click > Paste.

If you are on a different directory, just use either the absolute or the relative paths to that file:

./xcreep /home/root/flag.txt    # absolute path
./xcreep ../root/flag.txt       # relative path (if you are in /home/some-dir)

Because I was tired of (1) having to look up how to copy to clipboard with xclip and (2) not being able to cat file.txt > xclip or cat file.txt | xclip or simply xclip file.txt

But you can just make a simple script to wrap xclip

I know, but it was fun coding it in Go though