In the question How to append multiple lines to a file the OP was seeking a way to append multiple lines to a file within the shell. The solution:
cat <<EOT >> test.txt line 1 line 2 EOT
I want to prepend lines and my attempt looks like:
echo 3 >test.text cat test.text <<EOT >> test.text 1 2 EOT
But this results in an error:
cat: test.text: input file is output file
EDIT: for clarification, I am following a long server setup guide with instructions to manually edit configuration files. Editing at times involves prepending blocks of text to a file. In automating some of the steps, I want to retain the verbosity of the command by copying the text from the guide as-is and putting into a bash one-liner. For this reason the multi-line text input using
EOT is preferred.
EDIT: other answers using sed require backslashes to be appended to the end of each line but I want to enter multiple lines without modification.
Is there a way to prepend multiple lines to a file in a similar fashion above (ideally without a temporary file and installing