postinst is in nodejs 4.2.6~dfsg-1ubuntu4.
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 | #!/bin/sh
set -e
if [ "$1" = "configure" ]; then
if dpkg --compare-versions "$2" le 0.6.19~dfsg1-2; then
update-alternatives --remove js /usr/bin/node
fi
update-alternatives --install /usr/bin/js js /usr/bin/nodejs 200 \
--slave /usr/share/man/man1/js.1.gz js.1.gz /usr/share/man/man1/nodejs.1.gz
fi
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