seetxt: 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/seetxt - from package: seetxt

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