Bash uppercase after {. ! ?}

[Albert_U]

how can i convert the first letter after ".", "!" and "?" and new line to an uppercase letter?
example: "hello. my name is newbe.can u help me?" to " Hello. My name is newbe.Can u help me?"

i tried something with sed but it just convert just the first letter from new line
sed 's/^\([A-Za-z]\)\([A-Z-a-z]\+\)/\U\1\L\2/'

[Lars Noodén]

There's a way to do it in perl:

echo "hello. my name is newbe.can u help me?"  | perl -e 'while (<>) { s/^(\s*.)/\U$1/;s/([[:punct:]]\s*.)/\U$1/g;print}'

There might be a more efficient way. Basically that is a short program jammed into a single line.

while (<>) {                            # read from stdin until no more input
  s/^(\s*.)/\U$1/;                   # substitute
  s/([[:punct:]]\s*.)/\U$1/g;  # global substitute, pattern starts with punctuation
  print
}

All that takes effect on the default variable of perl, $_ which is implied if it is not written.

[steeldriver]

Possible slightly more compact version using lookbehinds?

perl -pe 's/((?<!.)|(?<=[[:punct:]])\W*)\w/\U$&/g'

(matches and uppercases any single word character that is preceded either by nothing or by punctuation and zero or more additional non-word characters)

[trent.josephsen]

Unnecessarily complex, I think. Perl's motto applies.

perl -pe 's/(^|[.!?])([a-z])/$1\U$2/g' # how I would write it using common idioms
perl -pe 's/(?<![^.!?])\w/\U$&/g'      # code golf version

[Lars Noodén]

trent and steeldriver, thanks. I was looking for -p, it eliminates the while loop.

[kurum!]

# echo "hello. my name is newbe.can u help me?" | ruby -e 'puts gets.split(/\s*\.\s*/).map(&:capitalize).join(". ") '
Hello. My name is newbe. Can u help me?