procan: 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 CentOS possible default full paths are:

/usr/bin/procan - from package: socat

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/procan - from package: socat

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

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