cd -
// Moved to last working directoryls -R
ls -R / > terminal_text.txtrm -rf
// remove all files in a directorycat abc.txt > abc-copy.txt
//create and copy file contentcat content.txt | [more,less]
cat [filename] | grep [search word] > [filename]
cat $(pwd)/[file-name]
// [$(pwd)->short way of writing long path]sed 's/[searching string]/[replacing string]/[g=global]' [filename]
grep -i [type word] [filename]
grep pi* [filename]
top
ps
ps -aux
elinks https://www.google.com/ &
// [run this process in bg]jobs
fg [job number]
bg
kill -9 [PSID]
// [kill process forcefully]free -h
cut -b [1-3,1,3] [text_filname]
df -hT -x tmpfs
ln -s [source-file-with-complete-path] [destination-soft-link-file-name]
dd
diff
wc