PR Summary

• New Markdown File Addition
  A new markdown file named 1001-bash-Math-with-dc.md has been added to the project.

• Content Enhancement for Mathematical Operations

  • The contents now cover how to conduct simple math operations using dc, a tool that utilizes reverse Polish notation.
  • The new content also discusses the usage of bc, a utility that allows calculations and comparisons with arbitrary precision.
  • Improvements have been made to perform arithmetic operations without the requirement of external programs by using the innate abilities of bash.
  • Lastly, basic arithmetic via expr is also covered which includes its limitations with integers and its capability to support regular expressions.

First commit and first PR.