What is the OR operator in bash?
Bash OR Logical Operator Bash boolean OR operator takes two operands and returns true if any of the operands is true, else it returns false. OR logical operator combines two or more simple or compound conditions and forms a compound condition.
What is the OR operator in Linux?
The OR Operator (||) is much like an ‘else’ statement in programming. The above operator allow you to execute second command only if the execution of first command fails, i.e., the exit status of first command is ‘1’.
What does || mean in shell script?
Just like && , || is a bash control operator: && means execute the statement which follows only if the preceding statement executed successfully (returned exit code zero). || means execute the statement which follows only if the preceding statement failed (returned a non-zero exit code).
How do you use operators in bash?
There are 5 basic operators in bash/shell scripting: Arithmetic Operators. Relational Operators. Boolean Operators….They are of 6 types:
- ‘==’ Operator: Double equal to operator compares the two operands.
- ‘!
- ‘<‘ Operator: Less than operator returns true if first operand is less than second operand otherwise returns false.
Who is a Unix operator?
Operating with a logic that is unique to itself, and conforming to principles in mathematics, logic, or algorithms, in the sense of Unix programming, is referred to as Unix operators.
Is Bash less than?
Integer Comparison
| -eq | is equal to if [ “$a” -eq “$b” ] |
|---|---|
| -le | is less than or equal to if [ “$a” -le “$b” ] |
| < | is less than (within double parentheses) ((“$a” < “$b”)) |
| <= | is less than or equal to (within double parentheses) ((“$a” <= “$b”)) |
| > | is greater than (within double parentheses) ((“$a” > “$b”)) |
How do you compare in Bash?
Comparison Operators When comparing strings in Bash you can use the following operators: string1 = string2 and string1 == string2 – The equality operator returns true if the operands are equal. Use the = operator with the test [ command. Use the == operator with the [[ command for pattern matching.
Which are the operators?
There are three types of operator that programmers use: arithmetic operators. relational operators. logical operators….Relational operators.
| Relational operation | Operator | Example |
|---|---|---|
| Assignment | = | x = 5 |
| Equivalence | = or == | if x = 5 or if x == 5 |
| Less than | < | if x < 5 |
| Less than or equal to | <= | if x <= 5 |