This file is indexed.

/usr/sbin/append-cmdline-arg is in initramfs-tools-ubuntu-touch 0.94vivid5.

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The actual contents of the file can be viewed below.

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#!/bin/sh

BOOT="LNX boot KERNEL"

for i in $BOOT; do
    path=$(find /dev -name "$i"|grep disk| head -1)
    [ -n "$path" ] && break
done

OLDCMDLINE="$(abootimg -i $path|grep cmdline|sed -e 's/^.*cmdline = //') "
echo $OLDCMDLINE| grep -q "empty cmdline" && OLDCMDLINE=""
NEWCMDLINE="${OLDCMDLINE}${1}"

abootimg -u $path -c "cmdline=$NEWCMDLINE"
abootimg -i $path