ontotext: 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 Debian possible default full paths are:

/usr/bin/ontotext - from package: emboss

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

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