shell script to change snake_case to camelCase

toCamel.sh

#! /bin/bash
# usage bash toCamel.sh target.js
# snake_func -> snakeFunc

for i in $(seq 1 30)
do
  cat $1 | sed -r 's/([a-z]+)_([a-z])([a-z]+)/\1\U\2\L\3/g' > temp
  mv temp $1
done

To treat names like host1_ip, I'd propose to use this regex:

's/([0-z]+)_([0-z])([0-z]+)/\1\U\2\L\3/g'

  echo "$string" |  sed -r 's/([A-Za-z])(^|_)(\w)/\1\U\3/g'

Idea: https://stackoverflow.com/a/34420162/1041470

• Unlimited number of underscores could be used.
• First char is lower case.