remove every second frame of GIF with gifsicle

gifsicle_remove2.sh

#!/bin/bash
# This script will take an animated GIF and delete every other frame
# Accepts two parameters: input file and output file
# Usage: ./<scriptfilename> input.gif output.gif

# Make a copy of the file
cp $1 $2
echo "copy completed"
# Get the number of frames
numframes=`gifsicle $1 -I | grep -P "\d+ images" --only-matching | grep -P "\d+" --only-matching`
echo "numframes completed"
# Deletion
gifsicle "$1" --unoptimize $(seq -f "#%g" 0 2 $numframes) -O2 -o "$2"
echo "script completed"

thank you. i found it useful

Failed on macOS for me. Ended up with a Gif with probably about three frames at the beginning.

@rjsteinert Try this version on mac.

//on macos, get numframes use this command:
numframes=gifsicle $1 -I | head -n 1 | awk '{print $3}'

To work with MacOS and Linux...

Replace:

numframes=`gifsicle $1 -I | grep -P "\d+ images" --only-matching | grep -P "\d+" --only-matching`

With:

os=$(uname -s)
if [[os == 'Darwin']]; then
    numframes=$(gifsicle $1 -I | head -n 1 | awk '{print $3}')
else
    numframes=`gifsicle $1 -I | grep -P "\d+ images" --only-matching | grep -P "\d+" --only-matching`
fi