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What are the basic operators in shell scripting?
There are 5 basic operators in bash/shell scripting: 1 Arithmetic Operators 2 Relational Operators 3 Boolean Operators 4 Bitwise Operators 5 File Test Operators
What are the operations and maintenance jobs at Shell?
Operations and Maintenance jobs at Shell are essential to the ongoing successes of the company. In one of our Operations and Maintenance roles, you will be part of a growing team that is tasked with the safe and efficient day-to-day operation of our global projects and assets.
How are relational operators used in Bourne shell?
Bourne Shell supports the following relational operators that are specific to numeric values. These operators do not work for string values unless their value is numeric. For example, following operators will work to check a relation between 10 and 20 as well as in between “10” and “20” but not in between “ten” and “twenty”.
When to use greater than operator in shell script?
‘<=’ Operator : Less than or equal to operator returns true if first operand is less than or equal to second operand otherwise returns false ‘>’ Operator : Greater than operator return true if the first operand is greater than the second operand otherwise return false.
How is shell script used to interact with files?
Most of the times, shell script is used to interact with files. Below is a program to check if a file exists or not In this example, we take file name input from the user. Note the “\\c” option, this is used to keep the cursor in the same line. Then we use “-e” option to check if the user entered file is present or not.
How to check if file exists in shell script?
“-f” option is used to check if the file exist and it is a regular file or not. “-d” option is used to check if the file exist and it is a directory file or not. “-b” to check block special file. “-c” to check character special file. “-s” to check file is empty or not.
How to read files from a shell script?
Now the text “Hello world from prodevelopertutorial.com” will be written in “hello.txt” file. In this example we shall look how to read files using while loop: Using “read” command. Using read command, we shall use read command along with a variable, then echo that variable to output. We use “<” input redirection to input the file.
What is the decrement operator in shell scripting?
Decrement operator (–) is used to subtract one from the current value of the operator. To show implementation of arithmetic operator in shell scripting − The relational operator in shell scripting defines the relations between operands.
How many bitwise operators are there in shell scripting?
There are 6 types of bitwise operators in shell scripting − Bitwise AND (&) is the operator that does the binary AND operation on the bits of the operands i.e. each bit of first variable is operated with respective bit of second operator.