This file is indexed.

/usr/share/quilt/previous is in quilt 0.63-8.2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#! /bin/bash

#  This script is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License version 2 as
#  published by the Free Software Foundation.
#
#  See the COPYING and AUTHORS files for more details.

# Read in library functions
if [ "$(type -t patch_file_name)" != function ]
then
	if ! [ -r $QUILT_DIR/scripts/patchfns ]
	then
		echo "Cannot read library $QUILT_DIR/scripts/patchfns" >&2
		exit 1
	fi
	. $QUILT_DIR/scripts/patchfns
fi

usage()
{
	printf $"Usage: quilt previous [patch]\n"
	if [ x$1 = x-h ]
	then
		printf $"
Print the name of the previous patch before the specified or topmost
patch in the series file.
"
		exit 0
	else
		exit 1
	fi
}

options=`getopt -o h -- "$@"`

if [ $? -ne 0 ]
then
	usage
fi

eval set -- "$options"

while true
do
	case "$1" in
	-h)
		usage -h ;;
	--)
		shift
		break ;;
	esac
done

if [ $# -gt 1 ]
then
	usage
fi

patch=$(find_patch_in_series "$1") || exit 1

previous=$(applied_before "$patch" | tail -n 1)
if [ -n "$previous" ]
then
	print_patch $previous
else
	exit 2
fi

### Local Variables:
### mode: shell-script
### End:
# vim:filetype=sh