hpithres: 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 CentOS possible default full paths are:

/usr/bin/hpithres - from package: openhpi32
/usr/bin/hpithres - from package: openhpi

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/hpithres - from package: openhpi-clients

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

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