Wrapper script for pb{copy,paste}, xsel, or text file buffer

pasteboard.bash

#!/bin/bash
#
# https://gist.github.com/jeebak/b864027c7b0338832e76
#
# Wrapper for pb{copy,paste}, as symlinks to this script, that's be in your
# $PATH. i.e.,
#   ln -s pasteboard.bash pbcopy
#   ln -s pasteboard.bash pbpaste
# The purpose of this script is to provide the familiar pb{copy,paste} commands
# on a Mac, and in Linux, either in X (where $DISPLAY'd be set) or in a
# console/terminal session.

# Remove  matching  prefix pattern. $(basename $0)
CALLED_AS="${0##*/}"
# Use: head -1, for the case where there'd be multiple matches:
#   brew install reattach-to-user-namespace
WHICH="$(which -a "$CALLED_AS" | grep -v "$0" | head -1)"

[[ -z "$WHICH" ]] && WHICH="$(which xsel)"

# Set a text file to use as a buffer, if xsel's not available, or it is and
# $DISPLAY's not set.
if [[ -z "$WHICH" ]] || { [[ "${WHICH##*/}" = "xsel" ]] && [[ -z "$DISPLAY" ]]; }; then
  pasteboard_file="${XDG_CACHE_HOME:-$HOME/.cache}"
  [[ ! -d "$pasteboard_file" ]] && mkdir -p "$pasteboard_file"

  pasteboard_file="$pasteboard_file/pasteboard.txt"
  [[ ! -f "$pasteboard_file" ]] && touch    "$pasteboard_file"
fi

options=""
case $CALLED_AS in
  pbcopy)
    [[ ! -z "$pasteboard_file" ]] && exec cat > "$pasteboard_file"
    options='--clipboard --input'
    ;;
  pbpaste)
    [[ ! -z "$pasteboard_file" ]] && exec cat   "$pasteboard_file"
    options='--clipboard --output'
    ;;
esac

exec "$WHICH" $options "$@"