Differing Quotations for Scripts in Examples

[kmradk]

Reviewing examples from Chapter 5 - 6.
Most commands including 'echo' are showing literal strings using single quotations ' '
Which affects variables.

var=output
echo "$var"; # output
echo '$var'; # $var

Based on the documentation I could find, isn't this an error or am I flunking my understanding of string literals?

[bobbyiliev]

Good question, and your understanding is correct.

In Bash this is expected behavior, not an error. Double quotes expand variables, while single quotes treat everything literally. For example as you mentioned "$var" prints the value of the variable, but '$var' prints the string $var.

[kmradk]

Apologies, I meant the text itself has examples using single quotations.
Per my understanding and the confirmation, it's misinforming new bash command line users.
My confusion was temporary, more-so concerned for future learners.

[bobbyiliev]

Ah thanks for the clarification @kmradk!

Do you happen to know which lines exactly and in which chapter this was the case? I can't seem to find those references.