fontlint: 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/fontlint - from package: fontforge

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

On Debian possible default full paths are:

/usr/bin/fontlint - from package: fontforge-nox
/usr/bin/fontlint - from package: fontforge

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

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