logtail: 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/sbin/logtail - from package: logcheck

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

On Debian possible default full paths are:

/usr/sbin/logtail - from package: logtail

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

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