tai64n: 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/tai64n - from package: daemontools

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

Error in other languages:
tai64n: bevel nie gevind nie
tai64n: comandă negăsită
tai64n: comando não encontrado
tai64n: commande introuvable
tai64n: command not found
tai64n: käsku ei ole
tai64n: không tìm thấy lệnh
tai64n: komanda nerasta
tai64n: Kommando nicht gefunden.
tai64n: kommandot finns inte
tai64n: komut yok
tai64n: nie znaleziono polecenia
tai64n: níor aimsíodh an t-ordú
tai64n: no se encontró la orden
tai64n: no s'ha trobat l'ordre
tai64n: opdracht niet gevonden
tai64n: parancs nem található
tai64n: perintah tidak ditemukan
tai64n: príkaz nenájdený
tai64n: příkaz nenalezen
tai64n: команда не найдена
tai64n: командата не е открита
tai64n: 命令找不到
tai64n: コマンドが見つかりません