This file is indexed.

/etc/skel/.mkshrc is in mksh 54-2+b4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Debian mksh
# Skeleton ~/.mkshrc file adding a level of indirection

# check if this is really mksh	# {((
case ${KSH_VERSION:-} in
*MIRBSD\ KSH*) ;;
*) return 0 ;;
esac				# }

# source the system-wide mkshrc file
[[ -s /etc/mkshrc ]] && \. /etc/mkshrc

# prepend $debian_chroot support to PS1
p=$'\001'
if [[ ${PS1:1:1} = $'\r' ]]; then
	p=${PS1:0:1}
	PS1=${PS1:2}
else
	p=$'\001'
fi
[[ -z ${debian_chroot:-} && -r /etc/debian_chroot ]] && \
    debian_chroot=$(</etc/debian_chroot)
PS1=$p$'\r${debian_chroot:+'$p$'\e[0;1m'$p'($debian_chroot)'$p$'\e[0m'$p'}'$PS1
\unset p

\: put your local alias/function definitions, patches, etc. here

# fixup ncurses-term badness
#[[ $TERM = screen.* ]] && TERM=screen

# force sane environment (e.g. for scripting), Debian-specific libc patch
#\export LC_ALL=C.UTF-8
# - or - switch to a slightly user-friendly and more portable locale
#\unset LANGUAGE LC_ADDRESS LC_ALL LC_COLLATE LC_IDENTIFICATION LC_MONETARY \
#    LC_NAME LC_NUMERIC LC_TELEPHONE LC_TIME
#p=en_GB.UTF-8
#\export LANG=C LC_CTYPE=$p LC_MEASUREMENT=$p LC_MESSAGES=$p LC_PAPER=$p

# in either case: sync mksh UTF-8 mode to current locale (expected on GNU)
set -U; [[ ${LC_ALL:-${LC_CTYPE:-${LANG:-}}} = *[Uu][Tt][Ff]?(-)8* ]] || set +U

# set a sensible editor
#p=$(\builtin whence -p jupp) || p=
#[[ -n $p ]] || p=$(\builtin whence -p jstar) || p=
#[[ -n $p ]] && export EDITOR=$p VISUAL=$p
#
#\unset p

\: make sure this is the last line, to ensure a good return code