grep: grep cd : change dir cat : print file cp : copy find : find file/directory ln: soft or hard link ls: inspect file/dir chown: change owner chmod: change rights mkdir: create dir mv: move file/dir du: print files sizes pwd: print current dir touch: create empty file df: filesystems and partitions details findmnt: mounted filesystems extensions details rm: remove file/dir stat: details of file/dir echo: print content of something tail: print the last lines of a file (mainly for logs) sed: edit lines of text by column (I think?) awk: like sed but more complicated an powerful
kill: kill process $pid htop/top: cpu activity
tcpdump: dump net int activity ping: ping
netstat: list active ethernet and socket connection
id: print echo id man: manual page info