Core shell and system administration commands.
ls
Lists directory contents.
cd
Changes the current working directory.
find
Searches a directory tree for files matching given criteria.
grep
Searches text for lines matching a pattern.
chmod
Changes a file or directory's permission bits.
chown
Changes the owning user and/or group of a file.
ps
Reports a snapshot of currently running processes.
kill
Sends a signal (by default SIGTERM) to a process, typically to stop it.
top
Shows a live, continuously-updating view of running processes and system resource usage.
df
Reports disk space usage for mounted filesystems.
ssh
Opens a secure shell session on a remote host.