Use the s (substitute) subcommand and these two special substitution characters to insert text at the beginning or end of a line:

^ (circumflex)

Inserts text at the beginning of a line

$ (dollar sign)

Inserts text at the end of a line

• To insert text at the beginning of the current working line, enter:

  s/^/newtext

• To insert text at the beginning of a specified line, enter:

  ns/^/newtext

  where n is the number of the line. This line becomes the current working line.
• To insert text at the end of the current working line, enter:

  s/$/newtext

• To insert text at the end of a specified line, enter:

  ns/$/newtext

  where n is the number of the line. This line becomes the current working line.