A simple command substitution example with bash scripting

substitution.sh

#!/bin/bash

# doing some simple substitution using ``

TODAYSDATE=`date`
USERFILES=`find . -user david`

echo "Today's Date: $TODAYSDATE"
echo "All files by USER: $USERFILES"

# other way of using substitution, using aliases
# expanding aliases -> normally this are represented on the bash_profile

shopt -s expand_aliases # expanding aliases to the subshells (override)

# setting the aliases
alias TODAY="date" # alias uses double quotes
alias UFILES="find . -user david" # find files and directories of the user "david"

# assiging alias to names
A=`TODAY`
B=`UFILES`

# printing
echo "With alias, Today is: $A"
echo "With alias, All files are in: $B"