In a shell command, the "&&" operator is used as a logical AND operator. It allows you to chain multiple commands together, ensuring that the subsequent command is executed only if the preceding command succeeds.
Here's how it works:
- When you use the "command1 && command2" syntax, the shell executes "command1" first.
- If "command1" returns a successful exit status (usually represented by an exit code of 0), the shell proceeds to execute "command2".
- If "command1" fails, meaning it returns a non-zero exit status, the shell stops executing the remaining commands in the chain, and "command2" is not executed.
Using "&&" can be useful when you want to perform a sequence of commands but want to ensure that each command succeeds before proceeding to the next one. It provides a way to conditionally execute subsequent commands based on the success of the previous ones.
Here's an example:
$ make && make install
In this example, the command "make" is executed first. If it completes successfully, only then the command "make install" is executed. If "make" fails, the "make install" command will not be executed.
This chaining behavior helps in writing more robust and efficient shell scripts by handling dependencies between commands and avoiding unnecessary execution when a previous command fails.
Post a Comment