How do I find location of executable file?
From https://salesforce.stackexchange.com/questions/272125/how-do-i-find-sfdx-cli-default-installation-folder-on-mac:
The simplest way is the type a command
which sfdx
in Terminal.
/usr/local/bin/sfdx
Another (longer and more complicated) way (which I initially used) is to type command
find / -iname sfdx
in the Terminal and search in the results for the actual path
/usr/local/lib/sfdx/bin/sfdx