Script bash s'arrête avec message ++ cat

Bonjour,

Lorsque j'installe le programme suivant, le script s'arrête ainsi  :

text=$(cat) # get text from stdin into text buffer
++ cat

 C'est la ligne après :

# 2022-02-13 -- Matthias C. Hormann aka Moonbase59
#   - Add sox commands for FR, IT, ES, to prevent error (missing /tmp/foliate-sox.wav).

Qui aurait une explication  pour le message

++ cat

 Merci.

 Je joins le script intégral ci-dessous.

#!/bin/bash -vx
 
# foliate-picotts -- Speak Foliate e-book using PicoTTS and PulseAudio
#
# Requirements:
# - pico2wave -- sudo apt install libttspico-utils
# - paplay -- Most modern systems now use PulseAudio for output
# - sox -- sudo apt install sox
# - sed -- POSIX standard command
#
# Use F5 within Foliate to start/stop speech.
#
# 2021-11-06 -- Matthias C. Hormann aka Moonbase59
#   - Code cleanup, bugfixing, added sox post-processing for better understanding.
#   - Added hypenation (en-dash, em-dash) support.
# 2021-11-09 -- Matthias C. Hormann aka Moonbase59
#   - Fixed paragraph (quoting) problem for pauses between paragraphs.
#   - More code cleanup.
#   - Reduce PicoTTS volume to 60% to avoid clipping.
#   - Added lots of pronunciation hints and corrections.
# 2022-01-01 -- Matthias C. Hormann aka Moonbase59
#   - Final adaption for Foliate as TTS output script.
#   - Added F5 start/stop handling (SIGINT to script by Foliate)
# 2022-02-13 -- Matthias C. Hormann aka Moonbase59
#   - Add sox commands for FR, IT, ES, to prevent error (missing /tmp/foliate-sox.wav).

text=$(cat) # get text from stdin into text buffer

# for debugging only
echo "$text" > /tmp/foliate-picotts.txt

# Remove some oddities inserted by Foliate
# Remove inserted ";"
text=$(echo "$text" | sed 's|; | |g')
# Redo "---" to emdash
text=$(echo "$text" | sed 's|---|—|g')
# Redo "--" to ndash
text=$(echo "$text" | sed 's|--|–|g')
# Redo "...." to dot plus ellipsis
text=$(echo "$text" | sed 's|\.\.\.\.|\.…|g')
# Redo "..." to ellipsis
text=$(echo "$text" | sed 's|\.\.\.|…|g')

# General text preprocessing
# Insert pauses for en- and em-dashes, recognize from<en-dash>to numeric ranges
# en-dash between digits spoken as "bis"
text=$(echo "$text" | sed 's|\([[:digit:]]\{1,\}\)–\([[:digit:]]\{1,\}\)|\1 bis \2|g')
# en-dash with white space around it spoken as a pause
text=$(echo "$text" | sed 's|[[:space:]]–[[:space:]]|<break time="500ms"/>|g')
# em-dash always spoken as a pause
text=$(echo "$text" | sed 's|—|<break time="500ms"/>|g')

# Map Foliate (=ebook) language to PicoTTS language (restricted set)

# for debugging only
echo "$FOLIATE_TTS_LANG_LOWER" > /tmp/foliate-picotts-lang.txt

case "${FOLIATE_TTS_LANG_LOWER:0:2}" in

    "de")
        lang="de-DE"
        # Abbreviations, acronyms and special characters
        # Note: Some are case-sensitive, others not.
        #       Some are full words only, others can be part of other words.
        #       Some can only be pronounced correctly using (XSAMPA) phonemes.
        #       Check RegExp flag "I" and "\b" word boundaries!
        # change "§" ("Paragrafzeichen") -> "Paragraf"
        text=$(echo "$text" | sed 's|§§|Paragrafen |g')
        text=$(echo "$text" | sed 's|§|Paragraf |g')
        # "S." -> "Seite"
        text=$(echo "$text" | sed 's|\bS\.|Seite|g')
        # "ff." -> "und folgende" (as in "S. 23 ff." or "S. 23ff.")
        text=$(echo "$text" | sed -E 's/(\b|[[:digit:]])(ff\.)/\1 und folgende/g')
        # change "Abs." ("Absender") -> "Absatz"
        text=$(echo "$text" | sed 's|\bAbs\.|Absatz|g')
        # "i." as in "Weißenburg i. Bay." -> "in" ("Bay." already recognized as "Bayern")
        text=$(echo "$text" | sed 's|\bi\.|in|g')
        # "Co." ("Compagnon") -> "Co."
        text=$(echo "$text" | sed 's|\bCo\.|Koh|g')
        # "MdB"/"M.d.B." -> "Mitglied des Bundestags"
        text=$(echo "$text" | sed 's|\bM\.d\.B\.|Mitglied des Bundestags|g')
        text=$(echo "$text" | sed 's|\bMdB\b|Mitglied des Bundestags|g')
        # "NASA"
        text=$(echo "$text" | sed 's|\bNASA\b|<phoneme ph=\"\\\"na:.za:\"/>|g')
        # "WLAN"
        text=$(echo "$text" | sed 's|\bWLAN\b|Weh-Lahn|g')
        # MPEG variants
        text=$(echo "$text" | sed 's|\bmpe\?g\b|M peck|gI')
        # JPEG variants
        text=$(echo "$text" | sed 's|\bjpe\?g\b|Tschähpeck|gI')
        # PNG
        text=$(echo "$text" | sed 's|\bpng\b|P N G|gI')
        # MP2, MP3, MP4
        text=$(echo "$text" | sed -E 's/\bmp(2|3|4)\b/M P \1/gI')


        # Other minor corrections
        # "geil"
        text=$(echo "$text" | sed 's|geil|gaihl|gI')
        # "Sex"
        text=$(echo "$text" | sed 's|\bSex\b|<phoneme ph=\"\\\"s\\Eks\"/>|g')
        # "asexuell"
        text=$(echo "$text" | sed 's|\basexuell|a-sexuell|gI')

        # Anglicisms
        # "Wow"
        text=$(echo "$text" | sed 's|\bwow\b|<phoneme ph=\"\\\"v\\a_U:\"/>|gI')
        # "University"
        text=$(echo "$text" | sed 's|\buniversity\b|Juni-Wörßiti|gI')
        # "nature"
        text=$(echo "$text" | sed 's|\bnature\b|Nätscher|gI')
        # "software"
        text=$(echo "$text" | sed 's|\bsoftware\b|ßoftwär|gI')
        # "smartphone"
        text=$(echo "$text" | sed 's|\bsmartphone|Smartphon|gI')
        ;;

    "en")
        lang="en-GB"
        # Abbreviations, acronyms and special characters
        # Note: Some are case-sensitive, others not.
        #       Some are full words only, others can be part of other words.
        #       Some can only be pronounced correctly using (XSAMPA) phonemes.
        #       Check RegExp flag "I" and "\b" word boundaries!
        # "&" ("ampersand") -> "and" (but not for HTML entities like &ndash;
        text=$(echo "$text" | sed 's|[[:blank:]]&[[:blank:]]| and |g')
        # change "§§" ("section section") -> "sections"
        text=$(echo "$text" | sed 's|§§|sections|g')
        # "p." -> "page", "pp." -> "pages"
        text=$(echo "$text" | sed 's|\bpp\.|pages|g')
        text=$(echo "$text" | sed 's|\bp\.|page|g')
        # "ff." -> "and following" (as in "p. 23 ff." or "p. 23ff.")
        text=$(echo "$text" | sed -E 's/(\b|[[:digit:]])(ff\.)/\1 and following/g')
        # "HTML"
        text=$(echo "$text" | sed 's|\bHTML\b|H T M L|g')
        # MPEG variants
        text=$(echo "$text" | sed 's|\bmpe\?g\b|M peg|gI')
        # JPEG variants
        text=$(echo "$text" | sed 's|\bjpe\?g\b|J peg|gI')
        # PNG
        text=$(echo "$text" | sed 's|\bpng\b|P N G|gI')
        # MP2, MP3, MP4
        text=$(echo "$text" | sed -E 's/\bmp(2|3|4)\b/M P \1/gI')

        # Other minor corrections
        ;;

    "fr")
        lang="fr-FR"
        # "Windows" (the operating system)
        text=$(echo "$text" | sed 's|\bwindows\b|<phoneme ph=\"win.doz\"/>|gI')
        # "Linux" (the better operating system)
        text=$(echo "$text" | sed 's|\blinux\b|<phoneme ph=\"li.nyks\"/>|gI')
        ;;

    "it")
        lang="it-IT"
        ;;

    "es")
        lang="es-ES"
        ;;

    *)
        lang="en-US"
        ;;
esac


# reduce volume to avoid clipping
text="<volume level=\"60\">$text</volume>"

# for debugging only
echo "$text" > /tmp/foliate-picotts-finished.txt

# cretae WAV audio file using PicoTTS
pico2wave -l=$lang -w=/tmp/foliate.wav "$text"

# use sox to make output better understandable (voices are rather muffled)
# adding some treble in the range of +3 to +6 dB helps
# some voices might need a little bass reduction, use s/th like "bass -6 400"
# to avoid clipping, give headroom (gain -h) and reclaim afterwards (gain -r)
case "${FOLIATE_TTS_LANG_LOWER:0:2}" in
    "de")
        sox /tmp/foliate.wav /tmp/foliate-sox.wav gain -h treble +6 gain -r
        ;;
    "en")
        sox /tmp/foliate.wav /tmp/foliate-sox.wav gain -h treble +3 gain -r
        ;;
    "fr")
        sox /tmp/foliate.wav /tmp/foliate-sox.wav gain -h treble +3 gain -r
        ;;
    "it")
        sox /tmp/foliate.wav /tmp/foliate-sox.wav gain -h treble +3 gain -r
        ;;
    "es")
        sox /tmp/foliate.wav /tmp/foliate-sox.wav gain -h treble +3 gain -r
        ;;
    *)
        cp /tmp/foliate.wav /tmp/foliate-sox.wav
        ;;
esac

# Prepare cleanup in case we get killed
function cleanup() {
    rm /tmp/foliate.wav
    rm /tmp/foliate-sox.wav
    rm /tmp/foliate-picotts.pid
}

# use PulseAudio to play in the background, remember player's PID
paplay /tmp/foliate-sox.wav > /dev/null & PID=$!
# save PID of player for possible xsay-kill on long texts
echo $PID >/tmp/foliate-picotts.pid

# trap SIGINT (issued by Foliate on 2nd F5)
trap "kill $PID; cleanup; exit 0" INT

# go wait for the spoken output (usually one page)
wait $PID

# Remove temporary files after paplay has finished (or was aborted using xsay-kill)
cleanup

Linux / Firefox 107.0