wc -l : counts line
cat ./home.txt | grep fav : it finds this fav word in the file
cat ./home.txt | grep -v fav : returns everything other than the fav word
grep cmd  /etc/ssl/openssl.cnf : it also finds the word in that same file with out pipe operator
grep -n ./characeter : adds the line number on side
grep -c ./character.txt : shows how many times the character was found 
grep -i ./character.txt : remove the case sensitivity


awk '{print}' ./file.txt : show all the content in the file
awk '{print $1}' ./file.txt : shows the first field
awk '{print $1,$3}' ./file.txt : shows the first and third field
awk '{print $NF}' ./file.txt : it will show the last field Number Field
awk -F ':' '{print $1}' /etc/passwd : it changes from tab to :
Example:
ls -l | awk '{print $3}'