Add the same text at the beginning of multiple lines

text_at_beginning.md

vim

• Press Ctrl-v to select the first column of text in the lines you want to change (visual mode).
• Press Shift-i and type the text you want to insert.
• Hit Esc, wait 1 second and the inserted text will appear on every line.

sed

$ sed -i 's/^/buku -u /' filename