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:read command to insert a file, or the output from a system command, into the current buffer. Examples:
:r foo.txt Insert the file foo.txt below the cursor. :0r foo.txt Insert the file foo.txt before the first line. :r !ls Insert a directory listing below the cursor. :$r !pwd Insert the current working directory below the last line.
On Windows, the last two commands would be:
:r !dir :$r !cd
Don't know the path to perl (for #!/.../perl)?
:r !which perl
I now no longer need to use "append system" code in my scripts. I used to use code like:
call append(line("."), system(l:cmd))
And because this puts the entire results of the system command on a single line separated by ^@, I need to split the lines up:
silent! exec "%s/\<CR>/\<CR>/g" silent! exec "%s/\<NL>/\<CR>/g"
The worst thing was when the results were really large (try running %s on a single 6Mb line... not pleasant) I can now just use
exec "r !".l:cmd