Bash script to open a file or URL in a pager

file-pager

#!/usr/bin/env bash

set -euo pipefail

if [[ $# == 0 || $1 == "-h" || $1 == "--help" ]]; then
    echo "Usage: $0 file"
    exit 0
fi

file="$1"

if [[ $file =~ ^http(s)?:// ]]; then
    temp_file=$(mktemp)
    wget --quiet "$file" --output-document "$temp_file"
    file=$temp_file
fi

if hash pager 2>/dev/null; then
    pager "$file"
else
    less "$file"
fi