didiwiki: 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/didiwiki - from package: didiwiki

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

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