smbtar: 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/smbtar - from package: samba4-client
/usr/bin/smbtar - from package: samba-client

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

On Debian possible default full paths are:

/usr/bin/smbtar - from package: smbclient

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

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