Helper script to install z.sh (jump around) - https://github.com/rupa/z

install_z_sh.sh

#!/bin/sh

SOURCE_URL="https://raw.githubusercontent.com/rupa/z/master/z.sh"
OUTPUT_LOC="$HOME/.z.sh"

usage_doc="Usage: $0 [-h] [-u url] [-o file]
  -h          this help
  -u <url>    download from <url>
                default: $SOURCE_URL
  -o <file>   download to <file>
                default: $OUTPUT_LOC
  -f         force overwrite of existing file
  -y         do not prompt for adding to rcfile"

main() {
  parse_args "$@"
  do_download
  ask_edit_rcfile
}

do_download() {
  if [ -z "$FORCE_OVERWRITE" ]; then
    [ -f "$OUTPUT_LOC" ] && err_exit "output file already exists: $OUTPUT_LOC"
  else
    rm -f "$OUTPUT_LOC" || err_exit "error removing existing file: $OUTPUT_LOC"
  fi
  if [ -x "$(command -v wget)" ]; then
    wget -qO "$OUTPUT_LOC" "$SOURCE_URL" || err_exit "wget failed"
  elif [ -x "$(command -v curl)" ]; then
    curl -so "$OUTPUT_LOC" "$SOURCE_URL" || err_exit "curl failed"
  else
    err_exit "$0 requires curl or wget to be installed"
  fi
  [ -f "$OUTPUT_LOC" ] || err_exit "could not create file: $OUTPUT_LOC"
  echo "Created: $OUTPUT_LOC"
}

add_to_rcfile() {
  if ! echo "source '$OUTPUT_LOC'" >>"$rcfile"; then
    err_exit "Could not add to $rcfile"
  fi
}

ask_edit_rcfile() {
  sh_name=$(basename "$SHELL")
  [ "$sh_name" = "bash" ] && rcfile="$HOME/.bashrc"
  [ "$sh_name" = "zsh" ] && rcfile="$HOME/.zshrc"
  if [ -z "$rcfile" ]; then
    echo "Could not determine rcfile for $sh_name"
    return
  fi
  if grep -q "source '$OUTPUT_LOC'" "$rcfile"; then
    echo "Already in $rcfile"
    return
  fi
  if [ -z "$FORCE_RCFILE" ]; then
    printf "Add $OUTPUT_LOC to %s? [y/n] " "$rcfile"
    read -r yn
    case $yn in
      [Yy]*) add_to_rcfile "$rcfile" ;;
      *) return ;;
    esac
  fi
  add_to_rcfile "$rcfile"
}

parse_args() {
  while getopts "hfyu:o:" opt; do
    case $opt in
    u) SOURCE_URL="$OPTARG" ;;
    o) OUTPUT_LOC="$OPTARG" ;;
    f) FORCE_OVERWRITE=1 ;;
    y) FORCE_OVERWRITE=1 && FORCE_RCFILE=1 ;;
    h) usage && exit 0 ;;
    *) usage ;;
    esac
  done
}

usage() { echo "$usage_doc" >&2; }

err_exit() {
  echo "Error: $1" >&2
  exit "${2:-1}"
}

main "$@"