A utility to create a gists from command line - for support, please check the repo https://github.com/ceremcem/create-gist

create-gist.sh

#!/bin/bash

GITHUB_USERNAME=rubo77

if [ "$1" == "" ]; then
  echo 'usage: gistfile-post.sh filename [gistname]'
  exit 0
fi

# 0. file name for the Gist
if [ "$2" == "" ]; then
  FNAME="$1"
else
  FNAME="$2"
fi

# 1. Somehow sanitize the file content
#    Remove \r (from Windows end-of-lines),
#    Replace tabs by \t
#    Replace " by \"
#    Replace EOL by \n
CONTENT=$(sed -e 's/\r//' -e's/\t/\\t/g' -e 's/"/\\"/g' "${FNAME}" | awk '{ printf($0 "\\n") }')

# 2. Build the JSON request
read -r -d '' DESC <<EOF
{
  "description": "some description",
  "public": true,
  "files": {
    "${FNAME}": {
      "content": "${CONTENT}"
    }
  }
}
EOF

# 3. Use curl to send a POST request

# ANONYMOUS GIST :
# curl -X POST -d "${DESC}" "https://api.github.com/gists"

# REGISTERED USER
curl -u "${GITHUB_USERNAME}" -X POST -d "${DESC}" "https://api.github.com/gists"

This was original asked here: https://stackoverflow.com/questions/26484337/upload-a-file-to-a-gist-with-bash and we continued the development from there.