When chaining commands in the terminal, you may need to do things that affect the shell's environment, like change directories. Here's an example:
$ yarn install && cd ios && pod install && cd .. && yarn build
These cd's can clutter up a script, and they're incidental. My solution is to
use a subshell (here's the explanation from man bash):
(list) list is executed in a subshell environment (see COMMAND EXECUTION ENVIRONMENT below). Variable assignments and builtin commands that affect the shell's environment do not remain in effect after the command completes. The return status is the exit status of list.
Note that last sentence; we can chain this subshell just like any command!
Here's our improvement; when the parens close the contextual change of the cd
is dropped and we're back in the root of the project.
$ yarn install && (cd ios && pod install) && yarn build