basic linux command set
egrep [^ letter] ^ means af ter that letter all lines are highlighted egrep[ letter $] $ means before that letter all lines are highlighted egrep[^letter$] inbetween letters are high lightedr -p stands for parent directory it will create folder in home elpthat set if u not use -p it will not create folder at home by default rm is used to delete only files not whole folder rm -rf is used to remove directory recursively without asking permission