Program to use for the |:grep| command. This option may contain '%' and '#' characters, which are expanded like when used in a command- line. The placeholder "$*" is allowed to specify where the arguments will be included. Environment variables are expanded |:set_env|. See |option-backslash| about including spaces and backslashes. When your "grep" accepts the "-H" argument, use this to make ":grep" also work well with a single file: > :set grepprg=grep\ -nH < Special value: When 'grepprg' is set to "internal" the |:grep| command works like |:vimgrep|, |:lgrep| like |:lvimgrep|, |:grepadd| like |:vimgrepadd| and |:lgrepadd| like |:lvimgrepadd|. See also the section |:make_makeprg|, since most of the comments there apply equally to 'grepprg'. For Win32, the default is "findstr /n" if "findstr.exe" can be found, otherwise it's "grep -n". This option cannot be set from a |modeline| or in the |sandbox|, for security reasons.