infoseq: 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/infoseq - from package: emboss

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

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