[Toybox] [PATCH] grep: add --quiet and --silent synonyms for -q.

[enh]

--quiet is used 3x more than --silent in my corpus, but they're both
used surprisingly often. (Surprising to someone who thinks -q is part of
the core set of grep options that "everybody knows".)
---
 toys/posix/grep.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/toys/posix/grep.c b/toys/posix/grep.c
index 42a4c0f1..d57e9221 100644
--- a/toys/posix/grep.c
+++ b/toys/posix/grep.c
@@ -10,7 +10,7 @@
 * echo hello | grep -f </dev/null
 *

-USE_GREP(NEWTOY(grep,
"(color):;S(exclude)*M(include)*ZzEFHIabhinorsvwclqe*f*C#B#A#m#x[!wx][!EFw]",
TOYFLAG_BIN))
+USE_GREP(NEWTOY(grep,
"(color):;S(exclude)*M(include)*ZzEFHIabhinorsvwclq(quiet)(silent)e*f*C#B#A#m#x[!wx][!EFw]",
TOYFLAG_BIN))
 USE_EGREP(OLDTOY(egrep, grep, TOYFLAG_BIN))
 USE_FGREP(OLDTOY(fgrep, grep, TOYFLAG_BIN))

-- 
2.21.0.rc0.258.g878e2cd30e-goog
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