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g: show all file names when grepping

When grep gets a single file argument, it does
not show the file name. This makes seeing the
file name in the output of 'g' difficult.

Pass a spare /dev/null to each invocation of g,
in order to force it to show the file name.

--- a/rc/bin/g

+++ b/rc/bin/g

@@ -23,6 +23,7 @@

 suffixes='\.([bcChlmsy]|asm|awk|cc|cgi|cpp|cs|go|goc|hs|java|lua|lx|mk|ml|mli|ms|myr|pl|py|rc|sh|tex|xy)$'

 fullnames='(^|/)mkfile$'

+repodirs='(^|/)(.git|.hg)($|/)'

 switch($#*){

 case 0

 	walk -f $recurse | grep -e $fullnames -e $suffixes >[2]/dev/null

@@ -34,4 +35,4 @@

 		if not

 			echo $f

 	}

-} | xargs grep -n $flags -- $pattern

+} | grep -v $repodirs | xargs grep -n $flags -- $pattern /dev/null