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April 5, 2023 21:22
Find the actual arch (arm64 or i386) of a Mac, even if running in Rosetta
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| ## Note - this should work in bash and zsh scripts | |
| ARCH=$(sysctl kern.version | awk -F'_' '/RELEASE/{print $2}') | |
| if [[ "$ARCH" == "ARM64" ]] | |
| then | |
| ARCH='arm64' | |
| elif [[ "$ARCH" == "X86" ]] | |
| then | |
| ARCH='i386' | |
| else | |
| echo "Unknown arch returned: '$ARCH'" >>/dev/stderr | |
| exit 2 | |
| fi | |
| echo "$ARCH" | |
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What problem is this trying to solve: Normally you would use the
archcommand to tell if your Mac is 'i386' or 'arm64'. However, your script (or even your Terminal.app) might be running under Rosetta (for example, as of 2020-12-28 that is the recommended way to runbrew), which would make it appear that you are on i386 even when you are on 'arm64'.When trying to download Mac apps that offer separate versions for Intel or ARM (M1/Apple Silicon), you probably want the ARM version, even if your terminal program is running under Rosetta.