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Assuming that $script contains the filename of a script you'd like to post as part of a comment on this site, this will prefix each line with '$' and pipe it into the X selection. From there just put the cursor in the right place in the comments box and middle-click.
Should work pretty much anywhere with xclip installed. On debian-ish systems this is installed as part of the package "xclip".
There are 6 alternatives - vote for the best!
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You can also do
xclip -o -selection clipboard | sed 's/^/$ /' | xclip -selection clipboardto prepend a "$ " to each line of text that's been copied into the X _clipboard_, eg via CTRL-C.
dropping the '-selection clipboard' will cause sed to act on the X _selection_, which is text that's been highlighted but not copied.
If you add '-selection clipboard' to the main example you will be able to paste the filtered file via CTRL-V instead of with the middle mouse button.