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Simple bash script to create a Bootable ISO from macOS Big Sur Install Image from Mac App Store
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| #!/usr/bin/env bash | |
| #=========================================================================== | |
| # Works only with the official image available in the Mac App Store. | |
| # Make sure you download the official installer before running this script. | |
| #=========================================================================== | |
| # Change this at your desire. Sometimes this works out of the box, sometimes not. | |
| # Default size: ~13.5 GB | |
| DISK_SIZE="13000m" | |
| #=========================================================================== | |
| hdiutil create -o /tmp/BigSur.cdr -size $DISK_SIZE -layout SPUD -fs HFS+J | |
| hdiutil attach /tmp/BigSur.cdr.dmg -noverify -mountpoint /Volumes/install_build | |
| sudo "/Applications/Install macOS Big Sur.app/Contents/Resources/createinstallmedia" --volume /Volumes/install_build --nointeraction | |
| hdiutil detach "/Volumes/Shared Support 1" | |
| hdiutil detach "/Volumes/Shared Support" | |
| hdiutil detach "/Volumes/Install macOS Big Sur" | |
| hdiutil convert /tmp/BigSur.cdr.dmg -format UDTO -o /tmp/BigSur.iso | |
| mv /tmp/BigSur.iso.cdr ~/Desktop/BigSur.iso | |
| rm /tmp/BigSur.cdr.dmg |
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