postinst is in inetutils-ftp 2:1.9.4-1build1.
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 8 9 10 11 12 13 | #!/bin/sh
set -e
update-alternatives \
--install /usr/bin/ftp ftp /usr/bin/inetutils-ftp 100 \
--slave /usr/bin/pftp pftp /usr/bin/inetutils-ftp \
--slave /usr/share/man/man1/ftp.1.gz ftp.1.gz \
/usr/share/man/man1/inetutils-ftp.1.gz \
--slave /usr/share/man/man1/pftp.1.gz pftp.1.gz \
/usr/share/man/man1/inetutils-ftp.1.gz \
--slave /usr/share/man/man5/netrc.5.gz netrc.5.gz \
/usr/share/man/man1/inetutils-netrc.5.gz
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