While Loop For Text File In Bash

In this article, we will explore different methods to loop through a file's content using Bash scripting, including reading line by line and word by word. Method 1 Using the 'while' Loop and 'read' Command. The 'while' loop combined with the 'read' command is the most common method to loop through the content of a file in

If you want the text file line by line including blank lines and terminating lines without CR, you must use a while loop and you must have an alternate test for the final line. Here are the methods that may change the file in comparison to what cat returns 1 Lose the last line and leading and trailing spaces

The while loop reads the file line by line using the read command, and the 'lt' character is used to redirect the input from the file. Reading a File Using the awk Command. The awk command is a powerful tool for text processing and data extraction in Unix-like operating systems. We can use the awk command with a while loop to read a file in Bash.

The while loop syntax. The syntax is while condition do command1 command2 .. . commandN done Command1..commandN will execute while a condition is true. To read a text file line-by-line, use the following syntax

Reading a file with a while loop We can read a file with a while loop in BASH. By parsing certain parameters to the while loop condition, we can iterate over the file line by line or by other groups like characters or words. First, we create a text file using a text editor in Linux, in this case we are using vim Text Editor. vim while.sh

Note that files with NUL characters in them are also not text files, and except in zsh that loop would also fail if the intention was to keep them as if they were allowed in text files. bash while loop that breaks at a given file size. 3. Looping over a folder enter anyways the loop. 1.

The while loop is the best way to read a file line by line in Linux.. If you need to read a file line by line and perform some action with each line - then you should use a while read line construction in Bash, as this is the most proper way to do the necessary.. In this article i will show the general syntax of the while read line construction in Bash and an example of how to read a file

Now, imagine our file contains some leading white space on line 2 Lorem ipsum dolor sit amet. Again, let's run our script .echo-lines.sh Lorem ipsum dolor sit amet. We get the same output as before. While reading the lines of the file, bash ignores leading white spaces because it considers them to be separator characters.

Create a file that contains the names of 7 days of the week. Now, read the names of the file using a while loop. Generate a bash script that prints only the file line containing a specific keyword. Take a file of your choice, count the number of lines present in that file, and print it in the terminal using bash while loop. Conclusion

You can use both bash for loop and while to read file contents in Linux and Unix. For more information see the manual pages using the help command or man command man bash help while help for. See also. Bash While Loop Examples Bash For Loop Examples Was this helpful? Please add a comment to show your appreciation or feedback.