over: 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 CentOS possible default full paths are:

/usr/bin/over - from package: enscript

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/over - from package: enscript

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

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