find
Find files and folders with find command:
find . -name "node_modules" -type d -prune
find . -name "node_modules" -type d -prune -print -exec rm -rf '{}' \;
tar
tar -cvpzf /backup/phyrum.tar.gz phyrum
tar -xvpzf /backup/phyrum.tar.gz -C /home/phyrum
Other
cat - Print content of file to the standard out
tail - Print last 10 lines of a file to the standard out
tail -f - Follow content
top htop - List process usage
wc -c - Count characters
od -c - Dump file in octal