acr-cat: command not found

Have You tried accessing the binary with the full path?

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/acr-cat - from package: acr

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