vim: how to redirect output from shell command ":!echo foo" to a buffer?

Question

Given two buffers side by side, with the source code in buffer 1, how do I to run the compiler (or any command line program) and see its output (stdout) in buffer 2?

Also, how do I use the current or specified buffer as stdin to this command line program?

What do you plan to do with the stdout? Do you know about :help :make and :help quickfix? — romainl
– romainl, Commented Apr 16, 2016 at 14:49
@romainl I didn't know quickfix plugin, that's probably what I need. Thanks. — George Sovetov
– George Sovetov, Commented Apr 16, 2016 at 15:00

dz902 · Accepted Answer · 2016-04-16 15:20:31Z

6

You can use :r! command to execute shell command and read its output to current buffer.

answered Apr 16, 2016 at 15:20

dz902

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muru · Accepted Answer · 2016-04-16 15:28:25Z

If you look at :h :b:

:[N]b[uffer][!] [+cmd] [N]              :b :bu :buf :buffer E86
                Edit buffer [N] from the buffer list.  If [N] is not given,
                the current buffer remains being edited.  See :buffer-! for
                [!].  This will also edit a buffer that is not in the buffer
                list, without setting the 'buflisted' flag.
                Also see +cmd.

And for +cmd:

                                                        +cmd [+cmd]
The [+cmd] argument can be used to position the cursor in the newly opened
file, or execute any other command:
        +               Start at the last line.
        +{num}          Start at line {num}.
        +/{pat}         Start at first line containing {pat}.
        +{command}      Execute {command} after opening the new file.
                        {command} is any Ex command.

So:

:2b +r!date

Would open buffer 2, and read in the output of the date command.

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