Add string to text file bash

Asked 11 years, 2 months ago. Active 9 years, 3 months ago. Viewed 28k times. Improve this question. Questions are always welcome here, but you might find this useful: commandlinefu. I was looking for something like this! I think you can add this as a legit response. You're welcome. I'll add it as a response, then. Add a comment. Active Oldest Votes. Improve this answer. However a little problem remains see appended questions for an example. I've also added a simplified version that should still do what you need.

I'll add that both versions are somewhat more simple than all these convoluted bash loops. One last thing. I have a file timing. How do you modify your command? I'm starting to see that your "mysterious" answers can contain pearls of bash wisdom It does a very simple "interactive" real-time edit of each matching file. I've had problems with, and heard other moanings, about sed's -i inline write..

I read your link about ed, and how it is interactive vs. You may want to look at this bash pitfall that advises checking if we have a file that matches our pattern before proceeding. Ah sorry, I accidentally put brackets in used in bash comparisons, the updated answer should work.

HatLess You can't use sed -i to process strings from a variable. It can only run directly on the file, and you don't want that here since it'll apply the edit to all lines, not just the one currently being operating on. If no substitutions took place, perform no further processing for the current line. Sign up or log in Sign up using Google.

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Related Hot Network Questions. Question feed. Sample error message: file exists: testFile. Using tee with option -a --append allows you to append to multiple files at once and also to use sudo very useful when appending to protected files. This thread has good answers about tee. WARNING: you are reading all lines into memory; memory is a limited resource, so don't go doing this for gigantic files. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How to append output to the end of a text file Ask Question. Asked 10 years, 7 months ago. Active 10 months ago. Viewed k times.

How do I append the output of a command to the end of a text file? Add a comment. Active Oldest Votes. The problem is that echo removes the newlines from the string. How do you append to a file a string which contains newlines? TimothySwan, I believe with the -e option.