xx-find-grep-sed: 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/xx-find-grep-sed - from package: xxdiff-scripts

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

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