reseq: 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/reseq - from package: teseq

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

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