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How to Delete Added (Not Modified) Lines Between Two Files In Bash?

6 minutes read

To delete added lines between two files in bash, you can use the diff command to compare the two files and then use grep to filter out the added lines. You can do this by running the following command:

1

diff file1.txt file2.txt | grep '^> ' | cut -c3- | comm -23 - <(sort -u file1.txt) | sed '/^>/d' > deleted_lines.txt


This command will compare file1.txt and file2.txt, filter out the added lines using grep, exclude the common lines between the two files using comm, remove the leading > from the added lines using sed, and finally save the deleted lines to deleted_lines.txt.

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What is the utility to delete added lines between two files in bash?

The diff command can be used to compare two files and find the differences between them, including any added lines. To delete the added lines between two files in bash, you can use the following command:

1

diff file1 file2 | grep -E '^>' | sed 's/^> //' | while IFS= read -r line; do sed -i "/$line/d" file2; done


This command compares the two files file1 and file2, extracts the added lines using grep, removes the > symbol at the beginning of each line using sed, and then deletes those lines from file2 using another sed command within a loop.


How to automate the process of removing added lines between two files in bash?

You can automate the process of removing added lines between two files in bash by using the diff command to find the differences between the two files and then using the sed command to remove the added lines.


Here's a simple example of how you can achieve this:

  1. Use the diff command to find the differences between the two files:
1

diff file1.txt file2.txt > diff.txt


  1. Use the sed command to remove the added lines from file2.txt:
1

sed -e 's/^>.*$//' diff.txt | sed -e '/^</d' > removed_lines.txt


This will create a new file removed_lines.txt that contains only the lines that were added in file2.txt.


You can also combine these two commands into a single line using pipes:

1

diff file1.txt file2.txt | sed -e 's/^>.*$//' | sed -e '/^</d' > removed_lines.txt


Make sure to replace file1.txt and file2.txt with the actual file names that you want to compare.


What is the process for removing added lines between two files in bash?

To remove added lines between two files in bash, you can use the diff command to identify the differences between the two files and then use the patch command to apply the differences to one of the files. Here is the process in more detail:

  1. Use the diff command to generate a diff file containing the added lines between the two files:
1

diff file1.txt file2.txt > added_lines.diff


  1. Use the patch command to apply the diff file to one of the files:
1

patch file1.txt < added_lines.diff


This will remove the added lines from file1.txt that are present in file2.txt.


Note: Make sure to create backups of your files before making any changes to them using diff and patch commands.

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