seq24: 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/seq24 - from package: seq24

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

Error in other languages:
seq24: bevel nie gevind nie
seq24: comandă negăsită
seq24: comando não encontrado
seq24: commande introuvable
seq24: command not found
seq24: käsku ei ole
seq24: không tìm thấy lệnh
seq24: komanda nerasta
seq24: Kommando nicht gefunden.
seq24: kommandot finns inte
seq24: komut yok
seq24: nie znaleziono polecenia
seq24: níor aimsíodh an t-ordú
seq24: no se encontró la orden
seq24: no s'ha trobat l'ordre
seq24: opdracht niet gevonden
seq24: parancs nem található
seq24: perintah tidak ditemukan
seq24: príkaz nenájdený
seq24: příkaz nenalezen
seq24: команда не найдена
seq24: командата не е открита
seq24: 命令找不到
seq24: コマンドが見つかりません