weblint: command not found

Have You tried accessing the binary with the full path?

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/weblint - from package: perl-HTML-Lint

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

On Debian possible default full paths are:

/usr/bin/weblint - from package: weblint-perl

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