Your problem is incorrect so there is no sol'n.
printf 'abc def' | grep -o '^[a-z]'
is only supposed to match against abc.
see grep(1) about pattern matching - there is plenty of online writeups, esp posix ieee std. see
also "ant / antlr" for more about patterns and matching.
Jim Pryor wrote:
The following reply was made to PR bin/166842; it has been noted by GNATS.
From: Jim Pryor <[email protected]>
$ printf 'abc def' | grep -o '^[a-z]'
will match against each of the letters in 'abc', but not against any of
the letters in 'def'.
[email protected]
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