crunchjpgs: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/crunchjpgs - from package: libcam-pdf-perl

You may install the required package with command apt-get install {package}

Error in other languages:
crunchjpgs: bevel nie gevind nie
crunchjpgs: comandă negăsită
crunchjpgs: comando não encontrado
crunchjpgs: commande introuvable
crunchjpgs: command not found
crunchjpgs: käsku ei ole
crunchjpgs: không tìm thấy lệnh
crunchjpgs: komanda nerasta
crunchjpgs: Kommando nicht gefunden.
crunchjpgs: kommandot finns inte
crunchjpgs: komut yok
crunchjpgs: nie znaleziono polecenia
crunchjpgs: níor aimsíodh an t-ordú
crunchjpgs: no se encontró la orden
crunchjpgs: no s'ha trobat l'ordre
crunchjpgs: opdracht niet gevonden
crunchjpgs: parancs nem található
crunchjpgs: perintah tidak ditemukan
crunchjpgs: príkaz nenájdený
crunchjpgs: příkaz nenalezen
crunchjpgs: команда не найдена
crunchjpgs: командата не е открита
crunchjpgs: 命令找不到
crunchjpgs: コマンドが見つかりません