seqsort: 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/seqsort - from package: embassy-domsearch

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

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