postinst is in rlwrap 0.37-2.
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 | #!/bin/sh
set -e
case "$1" in
configure)
update-alternatives \
--install /usr/bin/readline-editor readline-editor /usr/bin/rlwrap 60 \
--slave /usr/share/man/man1/readline-editor.1.gz readline-editor.1.gz /usr/share/man/man1/rlwrap.1.gz
;;
esac
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