There are list of linux commands which begin with ls
the common nature of the ls commads are listing operation here there are...
ls- list contents (commonly used).
lsof- list the opened files which is used by the running process.
lsusb-list the usb devices connected to the system.
lsmod-list the modules which is loaded in the running kernel.
lspci-list the pci(Peripheral Component Interconnect) devices (use lspci -vvx to get meaning full data othere wise expert can understand it).
lsattr-to list attributes of a file(attributes like immutable field)
lshal-list hal(Hardware Abstraction Layer, HAL which is a piece of software that provides a view of the various hardware attached to a system)devices