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From a structured file (such as an address book or /etc/passwd), it is entirely possible to retrieve the values of each field and assign them to several variables with the command 'read'.
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This article will introduce the concept of playing a file line by line in Linux with the help of examples and best user tips.
We'll walk you through some of the most common errors made when reading a file on the Linux platform, and show you examples of how the for loop and while loop outputs differ.
We'll also provide you with some tips and examples on how to initiate a loop, and how to use the while loop output.
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. In this example, the for loop leads to an assessment for each line, rather than as assessment of every word in the file.
Furthermore, the for loop coupled with a change of IFS helps keep the structure of the document output.
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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.
Here is a sample output with a for loop: for line in $ (cat file.txt) do echo "$ line" done The solution is to use a while loop coupled with the internal read.
It is also possible to get the result with a for loop, provided you change the value of the variable $ IFS (Internal Field Separator, internal field separator) before starting the loop.
The while loop remains the most appropriate and easiest way to read a file line by line.