macos - How to set icon on file or directory using CLI on OS X?

Question

To set an icon on a file or directory is straight forward using the "Get Info" dialog in Finder.

1. copy image from e.g. Preview
2. open "Get Info" on file or directory
3. press TAB to select the icon
4. paste Cmd-V

But how do you do this using the command line?

Answer 1

Here is a bash script "setIcon.sh" for it

#!/bin/sh
# Sets an icon on file or directory
# Usage setIcon.sh iconimage.jpg /path/to/[file|folder]
iconSource=$1
iconDestination=$2
icon=/tmp/`basename $iconSource`
rsrc=/tmp/icon.rsrc

# Create icon from the iconSource
cp $iconSource $icon

# Add icon to image file, meaning use itself as the icon
sips -i $icon

# Take that icon and put it into a rsrc file
DeRez -only icns $icon > $rsrc

# Apply the rsrc file to
SetFile -a C $iconDestination

if [ -f $iconDestination ]; then
    # Destination is a file
    Rez -append $rsrc -o $iconDestination
elif [ -d $iconDestination ]; then
    # Destination is a directory
    # Create the magical Icon
 file
    touch $iconDestination/$'Icon
'
    Rez -append $rsrc -o $iconDestination/Icon?
    SetFile -a V $iconDestination/Icon?
fi

# Sometimes Finder needs to be reactivated
#osascript -e 'tell application "Finder" to quit'
#osascript -e 'delay 2'
#osascript -e 'tell application "Finder" to activate'

rm $rsrc $icon