arithmetic expressions

The article explains side effects in Bash arithmetic expressions, particularly how pre-increment (`++i`) and post-increment (`i++`) operators affect a variable's value and the outcome of expressions. It highlights the importance of understanding these effects for efficient script writing in Bash, offering a detailed example and a script to demonstrate these concepts in action.

The article explains the function `(( i++ ))` in Bash, particularly with `i` initialized to 0 and under `set -e`. When `i=0`, `(( i++ ))` returns 1, considered an "error" due to returning "false", causing scripts with `set -e` to exit unexpectedly. Examples and strategies are provided to handle such issues effectively in Bash scripts.