uisp: 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/uisp - from package: uisp

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

On Debian possible default full paths are:

/usr/bin/uisp - from package: uisp

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

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