Linux: Prepend String to Each Line in File - Easy Solution

If you need to add a string to the beginning of each line in a file on a Linux system, there is an easy solution using the command line. The key command to use is "sed", which stands for stream editor.

To prepend a string to each line in a file, use the following command:

sed 's/^/your_string_here/' input_file > output_file

Replace "your_string_here" with the desired string you want to add to the beginning of each line. For example, if you want to add the string "prefix" to each line in a file named "example.txt", the command would be:

sed 's/^/prefix/' example.txt > output.txt

This will create a new file named "output.txt" with the modified contents.

Explanation:
- The "s" command in sed is used for substitution.
- The "^" character represents the beginning of each line.
- The "/your_string_here/" part of the command specifies the string you want to add to the beginning of each line.
- The "> output_file" part of the command redirects the output to a new file instead of modifying the original file.

In conclusion, adding a string to the beginning of each line in a file on Linux is a simple task using the "sed" command. This solution is quick and efficient for modifying large files.

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