owexist: 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/owexist - from package: ow-shell

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

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