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#!/bin/bash
s='This Is Not the Real string'
echo $s | sed -E 's/^([[:upper:]])|[[:blank:]]+([[:alpha:]])/\l\1\U\2/g'

Success #stdin #stdout 0s 4388KB

stdin

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Standard input is empty

stdout

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thisIsNotTheRealString

https://ideone.com/cHbGWs

language:

Bash (bash 5.0.3)

created:

visibility:

secret

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