Shell Scripting Tutorial for Beginners 8 - Logical 'AND' Operator 

The Logical AND "&&" is a boolean operator that executes following commands based on the outcome of previously executed commands.
Logical AND (&&) if [[expr1 && expr2]] Returns expr1 if it can be converted to false; otherwise, returns expr2. Thus, when used with Boolean values, && returns true if both operands are true; otherwise, returns false.
- for using And operator use &&
if [ "$age" -gt 18] && ["$age" -lt 30 ]
- The -a option provide an alternative compound condition test.
if [ "$age" -gt 18 -a "$age" -lt 30 ]
- if [[ $condition1 && $condition2 ]] # Also works.
if [[ "$age" -gt 18 && "$age" -lt 30 ]]
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