On 2019 Feb 10, at 15:27, Christopher Stone <[email protected]> wrote: > > Why does the parenthetic isolation of the command NOT change the working > directory of the shell?
Parentheses around shell commands create a "sub-shell". The sub-shell is a new shell environment separate from the parent shell session. It exits at the closing parenthesis. The environment in the sub-shell ceases to exist once it exits, and the parent shell remains unaffected. This is similar to a script, where any environment setting -- such as a change of working directory -- affects only the environment within the script, not the environment of the parent session. Another example of this is the sudo command: sudo creates a sub-shell with elevated privileges. So a command like sudo cd /some/private/directory accomplishes nothing. The sub-shell switches to the protected directory, then immediately exits, resulting in no net effect. -- This is the BBEdit Talk public discussion group. If you have a feature request or need technical support, please email "[email protected]" rather than posting to the group. Follow @bbedit on Twitter: <https://www.twitter.com/bbedit> --- You received this message because you are subscribed to the Google Groups "BBEdit Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/bbedit.
