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In for loop we can clearly see that any space or new line is treated the same way and appropriate treatment is given.

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In the above code we have put down all the methodologies we have described above. Here we see usability of the different methodologies.Įcho 'Understanding File reading using For loop'įor url in $(cat sites_for_fileread.txt) doĮcho 'Understanding File reading using read-while loop'Įcho 'Understanding File reading using IFS'Įcho 'Understanding File reading using argument passed through CLI'Įcho 'Understanding File reading using read-while loop using -r option' One would need to use -r option along with IFS or read while loop. Then it will be presented as it is rather than omitting them. What it eventually means is that if a line has etc.

Reading the file by backslash escape omission: In this methodology, the code omits the backslash escape and prints the line as it is.

This methodology is mainly used when a script is written to perform routine or repetitive tasks.

Read the file by passing an argument to the script: In this methodology the filename is sent as an argument in the script itself and is mainly used when the shell script provides a flexibility to the user to execute the code on the filename provided by them.

This way is mainly used for reading some parameters needed for code execution already set in other file. Here, one can’t change the filename until and unless they have access to the code. This type of read is specifically done when a programmer uses built in file for execution of the code.

Read the file using a script: In this methodology we would use the filename in the script itself.

There are essentially 3 different kinds of file read which is widely used in the industry. IFS is mostly used when one reads a file by backslash escape omission. IFS is nothing but an internal field separator which is used with while loop to split the words and line based on its value. Also one needs to make sure that an empty line is present in the end of the file. Both these loops are used keeping in mind the usability, and comfortableness of a developer to use any of the loops. The initialization is outside the while loop and that is the point of difference between for loop and read while loop. The main charismatic property is the ability to read line by line when you use the keyword read. In the while loop, if we have to read a file, we would need to use a keyword read and hence this while is known as read while loop. In the for loop, the initialization, condition check all happens in the syntax of the for loop itself.

The concepts of loop are to implement these repetitive task through code and create powerful constructs through codes without any human intervention. There are eventually 2 loops through which it is possible to read a file. Here we will see what kind of loops can be used for reading a file.

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Web development, programming languages, Software testing & others What is Shell Script Read File?

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