slogin: 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/slogin - from package: openssh-clients

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

On Debian possible default full paths are:

/usr/bin/slogin - from package: openssh-client

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

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