What is the purpose of "&&" in a shell command?

bash, command-line, shell, syntax

Solution

Furthermore, you also have `||` which is the logical or, and also `;` which is just a separator which doesn't care what happend to the command before.

$ false || echo "Oops, fail"
Oops, fail

$ true || echo "Will not be printed"
$  

$ true && echo "Things went well"
Things went well

$ false && echo "Will not be printed"
$

$ false ; echo "This will always run"
This will always run

Some details about this can be found here Lists of Commands in the Bash Manual.

Problem

As far as I know, using `&` after the command is for running it in the background. Example of `&` usage: `tar -czf file.tar.gz dirname &` But how about `&&`? (example)

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