latexrevise: 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/latexrevise - from package: latexdiff

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

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