prove: 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/prove - from package: perl-Test-Harness

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

On Debian possible default full paths are:

/usr/bin/prove - from package: libtest-harness-perl
/usr/bin/prove - from package: perl

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

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