New posts in Variable Substitution

Is "${PS1-}" valid syntax and how does it differ from plain "$PS1"?

Bash variable substitution in a JSON string

Grep to find the correct line, sed to change the contents, then putting it back into the original file?

How to avoid space after bash variable in string?

What does ${PATH:+:${PATH}} mean?

Why do here-documents attempt shell substitution even on a commented line?

Can command substitution be nested in variable substitution?

Append to PATH-like variable without creating leading colon if unset

Can I use variables inside {} expansion without `eval`?

bash ${VAR//search/replace} and weird regex behaviour