I have a requirement to read the file line by line from last line until the first line. Right now I am able to read the file line by line from start with the below piece of code.
while IFS= read line
do
#Logic here
done <"$Input_File"
Kindly help me out with a solution to read the file line by line from last line.
You can use tac to read the file from the last line until the first. Using your example you could do:
while IFS= read line
do
#Logic here
done <<<(tac "$Input_File")
See the manual page for tac (this may not be installed by default in your distribution but should be available using the package manager).
file="path/to/your/file.txt"
awk '{print NR ":" $0}' $file | sort -t: -k 1nr,1 | sed 's/^[0-9][0-9]*://'
