gnokiid: 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/gnokiid - from package: gnokii

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

On Debian possible default full paths are:

/usr/sbin/gnokiid - from package: gnokii-cli

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

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