Write a command to replace the word “bad” with “good” in file?

Write a command to duplicate each line in a file?

sed ‘p’ < filename

Write a command to redirect the output of date command to multiple files?

The tee command writes the output to multiple files and also displays the output on the terminal. date | tee -a file1 file2 file3

Write a command to find the total number of lines in a file?

wc -l filename Other ways to pring the total number of lines are awk ‘BEGIN {sum=0} {sum=sum+1} END {print sum}’ filename awk ‘END{print NR}’ filename