/usr/bin/lskpatches is in kernel-patch-scripts 0.99.36+nmu1.
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 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95  | #! /bin/bash
set -e
KPATCHDIR=/usr/src/kernel-patches
FORMAT='%-20s%-10s%-10s%-12s%s\n'
ARCH=$(dpkg-architecture -qDEB_HOST_ARCH)
DIRS_ALL_ALL=$(ls -d ${KPATCHDIR}/all/apply 2>/dev/null || true)
DIRS_ARCH_ALL=$(ls -d ${KPATCHDIR}/*/apply 2>/dev/null | grep -v "^${KPATCHDIR}/all/" || true)
DIRS_ALL_VERS=$(ls -d ${KPATCHDIR}/all/*/apply 2>/dev/null || true)
DIRS_ARCH_VERS=$(ls -d ${KPATCHDIR}/*/*/apply 2>/dev/null | grep -v "^${KPATCHDIR}/all/" || true)
# Note: additional "echo $()" calls used to strip spurious spaces
dhkp_kversions()
{
    echo $(grep ^KVERSIONS $1 | sed 's/^.*(\(.*\))$/\1/')
}
dhkp_version()
{
    local rcs=$(echo $(grep -F 'apply.tmpl $''Revision:' $1 | cut -d'$' -f2 | cut -d: -f2))
    local dhkp=$(grep ^DHPKPATCHES_VERSION= $1 | cut -d= -f2)
    if [ -n "${dhkp}" ]
    then
	# post-woody
	echo ${dhkp}
    elif [ -n "${rcs}" ]
    then
	# woody era
	echo "RCS ${rcs}"
    else
	echo '<not built using dh-kpatches>'
    fi
}
format()
{
    printf ${FORMAT} "$1" "$2" "$3" "$(dhkp_version $1)" "$(dhkp_kversions $1)"
}
# Header
printf ${FORMAT} PatchID Arch KVers dhkpVers dhkp-KVers
for dir in ${DIRS_ALL_ALL}
do
    (
	cd ${dir}
	for kp in $(ls)
	do
	    format ${kp} 'all' 'all'
	done
    )
done
for dir in ${DIRS_ARCH_ALL}
do
    (
	arch=$(basename $(dirname ${dir}))
	cd ${dir}
	for kp in $(ls)
	do
	    format ${kp} ${arch} 'all'
	done
    )
done
for dir in ${DIRS_ALL_VERS}
do
    (
	vers=$(basename $(dirname ${dir}))
	cd ${dir}
	for kp in $(ls)
	do
	    format ${kp} 'all' ${vers}
	done
    )
done
for dir in ${DIRS_ARCH_VERS}
do
    (
	vers=$(basename $(dirname ${dir}))
	arch=$(basename $(dirname $(dirname ${dir})))
	cd ${dir}
	for kp in $(ls)
	do
	    format ${kp} ${arch} ${vers}
	done
    )
done
 |