postinst is in linux-firmware 1.127.24.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #!/bin/sh
set -e
if [ -x /usr/sbin/update-initramfs ]; then
/usr/sbin/update-initramfs -u -k all
fi
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