/usr/bin/sensible-pager is in sensible-utils 0.0.6ubuntu2.
This file is owned by root:root, with mode 0o755.
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
${PAGER:-pager} "$@"
ret="$?"
if [ "$ret" -eq 126 ] || [ "$ret" -eq 127 ]; then
more "$@"
ret="$?"
if [ "$ret" -eq 126 ] || [ "$ret" -eq 127 ]; then
echo "Couldn't find a pager!" 1>&2
echo "Set the \$PAGER environment variable to your desired pager." 1>&2
exit 1
fi
fi
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