What's Like Osx's Pbcopy for Linux

Put a script like this called pbcopy in your bin folder:

#!/bin/bash
xclip -i -sel c -f |xclip -i -sel p

This will put STDIN in both your selection buffer and clipboard:

echo Hello world |pbcopy

To expand on the solutions of @Erik and @xpixelz; these two scripts should work on both platforms:

pbcopy:

#!/bin/bash
__IS_MAC=${__IS_MAC:-$(test $(uname -s) == "Darwin" && echo 'true')}
if [ -n "${__IS_MAC}" ]; then
  cat | /usr/bin/pbcopy
else
  # copy to selection buffer AND clipboard
  cat | xclip -i -sel c -f | xclip -i -sel p
fi

pbpaste:

#!/bin/bash
__IS_MAC=${__IS_MAC:-$(test $(uname -s) == "Darwin" && echo 'true')}
if [ -n "${__IS_MAC}" ]; then
  /usr/bin/pbpaste
else
  xclip -selection clipboard -o
fi

This answer refers to the Linux Subsystem for Windows.

Short answer: use clip.exe as if it were pbcopy in order to put something on the Windows clipboard. It's magic. Example echo "Hello Windows" | clip.exe in your bash or Ubuntu bash terminal, and then `ctrl-v' in a Windows program.

More context:

In a comment above I mentioned that, when using Xming on Windows to enable this functionality, it is necessary to set a DISPLAY variable (export DISPLAY=:0, in many cases) before the xsel and xclip solutions work. Infuriatingly, this solution works in an unreliable, stochastic way -- when pasting from Linux to Windows, pressing ctrl-v between one and ten times causes the clipboard to be pasted (one time) (this is on my Windows 10 Surface Book 2). Don't waste your time, use clip.exe.

NOTE: Don't forget the .exe. Otherwise Ubuntu bash will suggest that you install the Linux package geomview, which is not what you want.

In WSL2, you have clipcopy and clippaste which are equivalent to pbcopy and pbpaste.