squishyball: 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/squishyball - from package: squishyball

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

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