editdiff: 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/editdiff - from package: patchutils

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

On Debian possible default full paths are:

/usr/bin/editdiff - from package: patchutils

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

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