Docker Container IP

#!/bin/bash
#
# Find a container/pod id by fuzzy name/id.

if [ -z "${1}" ]; then
  echo 'Container name is missing.'
  exit 1
fi

# $1-n - the regex (pcre) pattern
function filter()
{
  docker ps --format '{{.ID}}|{{.Names}}' \
    | grep -P "${@}"
}

if [ $(filter "${@}" | wc -l) -gt 1 ]; then
  filter "${@}" --color=always >&2
  echo >&2
  echo "Error: Ambiguous match for: ${@}" >&2
  exit 1
fi

filter "${@}" | cut -d '|' -f1