sor: 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/sor - from package: pccts

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

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