print command output in shell script code example

Example 1: print in shell script

#!/bin/bash
DDAY="15-aug-2007" 
echo "D-Day is on $DDAY"
echo "Today is $(date)"
echo "Linux version : $(uname -r)"

Example 2: how to print output of a command linux

printf "$dir1 $dir2 $(tail -n -1 pes.log) \n" >> ../opt_done.txt