slim: 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/slim - from package: slim

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