olwmslave: 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/olwmslave - from package: olwm

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

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