1013 B
Executable File
1013 B
Executable File
The expr command
The expr command evaluates a given expression and displays its corresponding output. It is used for basic operations like addition, subtraction, multiplication, division, and modulus on integers and Evaluating regular expressions, string operations like substring, length of strings etc.
Syntax
expr expression
Few Examples:
-
Perform basic arithmetic operations using expr command
expr 7 + 14
expr 7 * 8
-
Comparing two expressions
x=10
y=20
res=`expr $x = $y`
echo $res
-
Match the numbers of characters in two strings
expr alphabet : alpha
-
Find the modulus value
expr 20 % 30
-
Extract the substring
a=HelloWorld
b=`expr substr $a 6 10`
echo $b
Additional Flags and their Functionalities
| Flag | Description |
|---|---|
--version |
output version information and exit |
--help |
Display this help and exit |
For more details: Expr on Wikipedia