revertpdf: 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/revertpdf - from package: libcam-pdf-perl

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

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