gkermit: 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/gkermit - from package: gkermit

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

On Debian possible default full paths are:

/usr/bin/gkermit - from package: gkermit

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

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