Bash printf format

printf "\n %20s \t %d " $BNAME $BEHIND

Printf in bash

printf "$your_var1 $your_var2 $(tail -n -1 your.log | grep Word_to_grep ) \n" >> ../opt_done.txt 

# several things, 
# printf with \n new line
# $(tail -n -1 your.log | grep Word_to_grep )  --> is a command, will output whats comes in terminal
			(if final line of the document has "Normal" to grep it will grep, oherwise nothing 
# $your_var1 $your_var2 variables
# >> this is an appending,

Printf @ bash

printf "My brother %s is %d years old.\n" Prakash 21

Source: linuxhandbook.com

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