We can do actions on a selection, just like any other ranges. While we have text
selected in visual mode, with : we can enter command mode and the prompt will
be pre filled with '<,'>.
'<: Start of selection.'>: End of selection.
It works like any other ranges like 12,15 which means from line 12 to line 15.
Save to a new file
We can save the selected content into a new file with w, the command will look
like: '<,'>w newfilename.
Pipe to a shell command
We can do some fancy magic with '<,'>!cmd. The output of the command will
replace the selected content. A few examples:
'<,'>!sort: sort selected lines with thesortcommand.'<,'>!sort | uniq': Sort and remove duplicated lines.'<,'>!pandoc -f markdown -t html': Convert markdown to HTML.'<,'>!python3': Evaluate withpython3and replace with the output.