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Can you read a file line by line in Bash?
When writing Bash scripts, you will sometimes find yourself in situations where you need to read a file line by line. For example, you may have a text file containing data that should be processed by the script. In this tutorial, we will discuss how to read a file line by line in Bash.
When to write a bash script, depends on the automation flow?
When writing a bash script, depends on the automation flow sometimes the script has to read the content from the file line by line. Here we learn 3 methods in a bash script to read file line by line. The simplest way to read a file line by line is by using the input redirector in a while loop.
What is the first statement on the while line in Bash?
The first statement on the while line is IFS=” . IFS stands for internal field separator. It holds values that Bash uses to identify word boundaries. By default, the read command strips off leading and trailing whitespace.
What’s the default input descriptor for Bash read?
Based on the accepted answer and on the bash-hackers redirection tutorial. Here, we open the file descriptor 3 for the file passed as the script argument and tell read to use this descriptor as input ( -u 3 ). Thus, we leave the default input descriptor (0) attached to a terminal or another input source, able to read user input.
Which is the best way to read a file line by line?
Method 1: Using Input Redirector. The simplest way to read a file line by line is by using the input redirector in a while loop. To demonstrate we have created a sample file named ‘mycontent.txt’ and will use it throughout this tutorial.
How to split two lines in bash script?
The -n 2 instructs xargs to consume and pass as separate arguments two lines of what you’ve piped into it at a time. You can tailor xargs to split on delimiters besides carriage return/newline. Use man xargs and google to find out more about the power of this versatile utility.