returned back grep for shell detection #83
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Returning grep for shell detection:
In the current version
if [[ "$SHELL" == */zsh ]]; thenproduces an error when using it via curl like this:curl --proto '=https' --tlsv1.2 -sSf https://install.spacesprotocol.org/ | sh,as double bracket matching [[...]] is actually not part of POSIX so
shcannot really use it, while it can usegrepwhich is POSIX and should be in all shells.