How to read a file line by line

How to read a file line by line

This article introduces the concept of playing a file line by line in Linux with the help of examples and tips along with a guided tour of initiating a loop. The article discusses the errors committed while reading a file line by line on the Linux platform. With samples and illustrations, it shows how the 'for loop' and 'while loop' differ in their respective outputs. It also provides tips on how to use the while loop and depicts its syntax. It concludes with the process behind initiating a loop along with the side effects the while loops can exhibit. One of the most common errors when using scripts bash on GNU / Linux is to read a file line by line by using a for loop (for line in $ (cat file.txt) do. ..), which in this example leads to an assessment for each line and not every word of the file. It is possible to change the value of the variable $ IFS (Internal Field Separator, internal field separator) with a for loop before starting the loop. Sample output with a for loop:

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