zthread-config: 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/zthread-config - from package: libzthread-dev

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

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