servertell: 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 Debian possible default full paths are:

/usr/bin/servertell - from package: emboss

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