publican: 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/publican - from package: publican

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

On Debian possible default full paths are:

/usr/bin/publican - from package: publican

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

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