Oct 6, 2009 · My solution is: Combining sed and wc commands, counting the first and last lines, and then looping through each line: end=$(wc -l peptides.txt | cut -d ' ' -f 1) currentLine=1 while [ $currentLine -le $end ] do echo $(sed -n "${currentLine}p" peptides.txt) let currentLine++ done

With the bash shell, you can get each line of a file into an array with the readarray builtin: readarray -t lines < input.txt && for line in "${lines[@]}"; do do-some-non-text-processing-you-cannot-easily-do-with-xargs "$line" || break done

Feb 24, 2020 · Learn how to write a Bash script to go through the lines of a file using a for loop. You can use this to parse a text file line by line.

Mar 22, 2023 · The most efficient way to process any file, one line at a time, is to develop a bash script and give the file as input to the script. This can be done by reading a file line by line by iterating the lines over a loop. Bash treats each line as an element in a list.

Apr 24, 2024 · For loop iterates through a predefined list. If a list of files is passed through a loop, then any kind of processing can be done on each file utilising for loop. In this section, a bash script will be developed to go through a list of files and print the content of each file. The bash script is below: echo "Processing $f file..."

Sep 20, 2021 · To output each line, we create a bash script and use a while loop to iterate through our file and call it echo-lines.sh: Using the angle bracket, we pass the contents of lorem-ipsum.txt to the while loop, line by line. When we run it, the output is as we expected: It seems we have found an easy way to loop through the contents of a file.

The simplest, I think, would be to use xargs, e.g., The -L1 / --max-lines=1 option tells xargs to process one input line at a time. You might take a look at GNU parallel, too, which is very similar to xargs but more powerful in some situations. You must log in to answer this question. Find the answer to your question by asking.

When you want to process each line in a file, the for loop presents a straightforward approach. Here’s how it can be done: In this example, `cat filename.txt` outputs the content of the specified file, and the for loop iterates over each word rather than each line.

In the bash script, the “ for ” is utilized for iteration purposes and can be used to read the lines of the file. The lines read by the “ for ” loop can be used to serve a specific purpose, i.e., copying or printing the content line by line.

Apr 24, 2024 · The best way to read a text file line by line is to use the bash while loop. The while loop syntax is as follows: do . COMMANDS. done. OR. do echo " $line " done < / path / to / input.txt. In this example, read /etc/passwd file line by line using while loop. Create a new file named script.sh using a text editor such as vim or nano. For example: