psmwatch: 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/psmwatch - from package: ion

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

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