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You cannot insert content at the beginning of a file. The only thing you can do is either replace existing content or append bytes after the current end of file.

Any solution to your question then requires a temporary file (or buffer) to be created (on memory or on disk) which will eventually overwrite the original file.

Beware not loosing data by preserving the original file while building the new one, should the file system happen to be full during the process. eg:

cat <(echo task go there) todo.txt > todo.txt.new && mv todo.txt.new todo.txt

You cannot insert content at the beginning of a file. The only thing you can do is either replace existing content or append bytes after the current end of file.

Any solution to your question then requires a temporary file (or buffer) to be created (on memory or on disk) which will eventually overwrite the original file.

Beware of not losing data by preserving the original file while creating the new one, should the file system happen to be full during the process. eg:

cat <(echo task go there) todo.txt > todo.txt.new && mv todo.txt.new todo.txt

You cannot insert content at the beginning of a file. The only thing you can do is either replace existing content or append bytes after the current end of file.

Any solution to your question then requires a temporary file to be created (on memory or on disk) which will eventually overwrite the original file.

Beware not loosing data by preserving the original file while building the new one, should the file system happen to be full during the process. eg:

cat <(echo task go there) todo.txt > todo.txt.new && mv todo.txt.new todo.txt

You cannot insert content at the beginning of a file. The only thing you can do is either replace existing content or append bytes after the current end of file.

Any solution to your question then requires a temporary file (or buffer) to be created (on memory or on disk) which will eventually overwrite the original file.

Beware not loosing data by preserving the original file while building the new one, should the file system happen to be full during the process. eg:

cat <(echo task go there) todo.txt > todo.txt.new && mv todo.txt.new todo.txt

You cannot insert content at the beginning of a file. The only thing you can do is either replace existing content or append bytes after the current end of file.

Any solution to your question then requires a temporary file to be created (on ram or on disk) which will eventually overwrite the original file.

You cannot insert content at the beginning of a file. The only thing you can do is either replace existing content or append bytes after the current end of file.

Any solution to your question then requires a temporary file to be created (on memory or on disk) which will eventually overwrite the original file.

Beware not loosing data by preserving the original file while building the new one, should the file system happen to be full during the process. eg:

cat <(echo task go there) todo.txt > todo.txt.new && mv todo.txt.new todo.txt