Answer Posted / jayachandran.g.r

it is used to use arithmatic operation in shell scripting

stntx: expr op1 opertor op2

where op1 and op2 may be any integer no(without any
decimalpoint)and operator can be
+ Addition
- Subtraction
/ division
% Modular
\* Multiplication


EX: $expr 1 + 3


o/p 4

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