seqnr: 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/seqnr - from package: embassy-domsearch

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

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