Entware is package repository for embedded devices. These packages allow you to add new functionality to your device. Most of them taken from OpenWRT, but others are unique. It's usable by router firmwares such as DD-WRT/Tomato/AsusWRT, by Realtek RTD1073/1283/1185/1186 based players, and so on.
Prepare USB drive, or other storage, and type:
Soft-float ( Works with both soft-float & hard-float firmwares. )
wget -O - http://entware.wl500g.info/binaries/mipselsf/installer/entware_install.sh | sh
Hard-float ( Works only with hard-float firmwares. )
wget -O - http://entware.wl500g.info/binaries/entware/installer/entware_install.sh | sh
A basic packages will be deployed. See available packages:
Install desired ones:
opkg install mc
See other OPKG commands here.