postinst is in mono-utils 4.6.2.7+dfsg-1.
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 | #!/bin/sh -e
update-alternatives \
--install /usr/bin/cli-ildasm cil-disassembler /usr/bin/monodis 10 \
--slave /usr/share/man/man1/cli-ildasm.1.gz cli-ildasm.1.gz /usr/share/man/man1/monodis.1.gz
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