smilint: 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/smilint - from package: libsmi

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

On Debian possible default full paths are:

/usr/bin/smilint - from package: smitools

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

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