evilwm: 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/evilwm - from package: evilwm

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

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