The following are the commands i frequently use in the Embedded Linux CLI of pogoplug.
ssh : ssh to a remote server from any terminal.
ps : show a list of running processes. (like Task Manager in Windows)
grep : Filter results using regular expressions
cat /proc/meminfo : shows the memory usage by process wise
dmesg : Shows the kernel ring buffer/drivers
rsync : used to sync files between rsync server and clients. This uses delta sync for faster syncing
mount : mount a disk with readonly, read write etc
curl : curl is a tool to transfer data from or to a server, using one of the supported protocols
wget : wget is mostly used to retrieve content from web servers
kill : kill a specific process based on pid (process Id). This is similar to end task in Windows
pidof : this will be useful if you want to know the pidof a daemon service so that you can kill it.