#!/bin/sh

if [[ -n $1 ]]; then
    echo "File contains $(pdfinfo $1 | awk '/^Pages:/ {print $2}') pages"
else
    total=0
    for file in *.pdf; do
        count=$(pdfinfo $file | awk '/^Pages:/ {print $2}')
        echo "$count pages in $file"
        total=$(($total + count))
    done

    echo "
Total page count is $total
"
fi