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A Better Way to Use Xclip (Clipboard From the Command Line)

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Sometimes you just want to copy something from your terminal and paste it somewhere else. You might have heard of a Linux program called xclip, which provides a command line interface to X selections. However, xclip’s default selection isn’t the clipboard, and typing xclip -selection c -i ~/.ssh/id_rsa.pub is just a bit tedious.

So here’s a wrapper function that makes it less of a hassle to integrate the clipboard with the command line.

  • It handles input via pipe or parameters.
  • It automatically uses the contents of a file if you pass it a valid filename.
  • It prints an excerpt of what has been copied, truncated to 80 characters.

Examples

  • Pipe anything to the clipboard
$ tail -n 100 /var/log/apache2/error.log | cb
# => Copied to clipboard: [Sun Oct 02 08:02:08 2011] [notice] Apache/2.2.17 (Ubuntu) configured -- resumin...
  • Copy the contents of a file to the clipboard
$ cbf ~/.ssh/id_rsa.pub
# => Copied to clipboard: ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAnwaNIuOhZzUeR6/xEEudXt3zEh91dawhkkKx8p/+4Bw9...
  • Type straight into the clipboard
$ cb This is some unquoted text.
# => Copied to clipboard: This is some unquoted text.

No options, no man pages.

It also comes with a handy cb_ssh alias that copies your SSH public key to the clipboard, for when you are setting up your new BitBucket account with unlimited, free private git repositories! I’m not affiliated with Atlassian, I just think they’re awesome.

So if you think this looks handy, you can add the following to your ~/.bashrc:

# A shortcut function that simplifies usage of xclip.
# - Accepts input from either stdin (pipe), or params.
# ------------------------------------------------
cb() {
  local _scs_col="\e[0;32m"; local _wrn_col='\e[1;31m'; local _trn_col='\e[0;33m'
  # Check that xclip is installed.
  if ! type xclip > /dev/null 2>&1; then
    echo -e "$_wrn_col""You must have the 'xclip' program installed.\e[0m"
  # Check user is not root (root doesn't have access to user xorg server)
  elif [[ "$USER" == "root" ]]; then
    echo -e "$_wrn_col""Must be regular user (not root) to copy a file to the clipboard.\e[0m"
  else
    # If no tty, data should be available on stdin
    if ! [[ "$( tty )" == /dev/* ]]; then
      input="$(< /dev/stdin)"
    # Else, fetch input from params
    else
      input="$*"
    fi
    if [ -z "$input" ]; then  # If no input, print usage message.
      echo "Copies a string to the clipboard."
      echo "Usage: cb <string>"
      echo "       echo <string> | cb"
    else
      # Copy input to clipboard
      echo -n "$input" | xclip -selection c
      # Truncate text for status
      if [ ${#input} -gt 80 ]; then input="$(echo $input | cut -c1-80)$_trn_col...\e[0m"; fi
      # Print status.
      echo -e "$_scs_col""Copied to clipboard:\e[0m $input"
    fi
  fi
}
# Aliases / functions leveraging the cb() function
# ------------------------------------------------
# Copy contents of a file
function cbf() { cat "$1" | cb; }  
# Copy SSH public key
alias cbssh="cbf ~/.ssh/id_rsa.pub"  
# Copy current working directory
alias cbwd="pwd | cb"  
# Copy most recent command in bash history
alias cbhs="cat $HISTFILE | tail -n 1 | cb"  

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