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We're a place where coders share, stay up-to-date and grow their careers. # RELATIONAL OPERATORS OF WHILE LOOP IN LINUX/UNIX SHELL SCRIPT shiv
DevOps Engineer

# Unix / Linux - Shell Relational Operators:

Relational operators that are purely supports numeric values.It does not support any other strings etc.

#### 1. -eq operator

compares whether the value of two operands are equal or not.If true then -eq operator becomes true.

Example:

#!/bin/sh
a=30
b=30

if [ \$a -eq \$b ]
then
echo "\$a -eq \$b : a is equal to b"
else
echo "\$a -eq \$b: a is not equal to b"
fi

Output:

30 -eq 30: a is equal to b

#### 2. -ne operator

Compares whether the value of two operands are not equal or not.If true,then -ne operator becomes true.

Example:

#!/bin/sh
a=30
b=50

if [ \$a -ne \$b ]
then
echo "\$a -ne \$b: a is not equal to b"
else
echo "\$a -ne \$b : a is equal to b"
fi

Output:

30 -ne 50: a is not equal to b

#### 3. -gt operator

Compares whether the value of left operand is greater than the value of right operand.If true,then -gt operator becomes true.

Example:

#!/bin/sh
a=60
b=30

if [ \$a -gt \$b ]
then
echo "\$a -gt \$b: a is greater than b"
else
echo "\$a -gt \$b: a is not greater than b"
fi

Output:

60 -gt 30: a is greater than b

#### 4. -lt operator

Compares whether the value of left operand is less than the value of right operand.If true, then -lt operator becomes true.

Example:

#!/bin/sh
a=40
b=70

if [ \$a -lt \$b ]
then
echo "\$a -lt \$b: a is less than b"
else
echo "\$a -lt \$b: a is not less than b"
fi

Output:

40 -lt 70: a is less than b

#### 5. -ge operator

Compares whether the value of left operand is greater than or equal to the value of right operand.If True, then -ge operator becomes true.

Example:

#!/bin/sh
a=50
b=20

if [ \$a -ge \$b ]
then
echo "\$a -ge \$b: a is greater or equal to b"
else
echo "\$a -ge \$b: a is not greater or equal to b"
fi

Output:

50 -ge 20: a is greater or equal to b

#### 6. -le operator

Compares whether the value of left operand is less than or equal to the value of right operand.If true, then the it becomes true.

Example:

#!/bin/sh
a=40
b=40

if [ \$a -le \$b ]
then
echo "\$a -le \$b: a is less or equal to b"
else
echo "\$a -le \$b: a is not less or equal to b"
fi

Output:

40 -le 40: a is less or equal to b