ewfacquirestream: 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/ewfacquirestream - from package: ewftools

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

On Debian possible default full paths are:

/usr/bin/ewfacquirestream - from package: ewf-tools

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

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