Virtual printer for manually printing two sided

hp-virtual.sh

#!/bin/bash
# Place this file at /usr/lib/cups/hp-virtual, chown root:root and chmod 0744.

if [[ $# -eq 0 ]]; then
        echo 'file hp-virtual:/ "HP Virtual Printer" "HP Virtual Printer"'
        exit 0
fi

JOBID="$1"
USER="$2"
TITLE="$3"
COPIES="$4"
OPTIONS="$5"
INPUT_FILE="$6"

# 3. Create a temporary file for the PDF
filename=$(mktemp /tmp/hp-virtual.XXXXXXXX.pdf)

# 4. Handle Input (Crucial Fix)
# If $6 is provided, use it. If not, read from stdin.
if [ -n "$INPUT_FILE" ]; then
    cat "$INPUT_FILE" > "$filename"
else
    cat - > "$filename"
fi

# 5. Check if the file is actually a PDF
# Some apps send PostScript. If so, convert it on the fly.
file_type=$(file -b --mime-type "$filename")
if [[ "$file_type" == "application/postscript" ]]; then
    ps2pdf "$filename" "${filename}.tmp"
    mv "${filename}.tmp" "$filename"
fi

echo -e "\n[Obojstranná tlač] Tlačím nepárne strany..." > /dev/tty0
lp -s -d HP_LaserJet_1020 -t "${TITLE}-even" -o page-set=even -o orientation-requested=6 -o outputorder=reverse "${filename}"

echo -e "\n[Obojstranná tlač] Keď sa tlač dokončí, PRELOŽ vytlačené strany do podávača papiera (bez otáčania či preklápania) a STLAČ akékoľvek tlačidlo" > /dev/tty0
read -n 1 -s < /dev/tty0
echo -e "\n[Obojstranná tlač] Tlačím párne strany..." > /dev/tty0

lp -s -d HP_LaserJet_1020 -t "${TITLE}-odd" -o page-set=odd "${filename}"

rm -f "${filename}"