This script is the self-extracting archive template. The MD5 of archive data is a69fb4d0185baa34f1a809de747a22f7.

self-extract-script.sh

#!/bin/bash --posix
# -*- coding:utf-8 -*-

# === Coding shell scripting Memo ==============================================
# === Initialize shell environment =============================================
#set -u                        # Just stop undefined values.
#set -e                        # Just stop error.
#set -x                        # Debug running command.

umask 0022
export LC_ALL=C
export LANG=C
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/bin:${PATH+:}${PATH-}"
type command >/dev/null 2>&1 && type getconf >/dev/null 2>&1 &&
PATH="$(command -p getconf PATH):${PATH}"
export PATH
export UNIX_STD=2003          # to make HP-UX conform to POSIX

# === Define the functions for printing usage and error message ================
usage_and_exit(){
    cat <<-"USAGE" 1>&2
# About

This script is the self-extracting archive. Archives are extracted the <script>
directory. If the autrun.sh is contained archive, this script ask to run it.
This script require the tar( and gzip, gunzip) and openssl( or md5sum) command.

Archives in this script are the self template and the autrun shell script.

If you want to exchange the archive data, replace the end data block of this file.
The data block should be base64 encoded (`tar zcvf <target> | base64`).

# Usage

## Command

<script name> options

## Options

- -h |--help |--version
  +  This help.
- -x
  +  Permitting to extract. If the option -x is omitted, the program exits with abnormality 1.
- -c <sum>
  + Checking self-sum and <sum> and Skiping to confirm.
- -l
  + Show file list in archive.

# Version

2022-01-06 0.01

# LICENSE

[CC0(Public domain)](https://creativecommons.org/publicdomain/zero/1.0/legalcode)

# Author

2022 td-shi

USAGE

    exit 1
}

error_exit() {
    ${2+:} false && echo "${0##*/}: $2" 1>&2

    exit "$1"
}

# === Initialize parameters ====================================================
SELF_DIR="$(cd "$(dirname "${0}")" && pwd)"
SELF_NAME="$(printf "%s" "${0##*/}" | sed "s/\.sh//")"
SELF_FULL="${SELF_DIR}/${0##*/}"

SUM_DGST="md5"

PERMIT_EXTRACT="0"
CHECK_SUM=""
CORRECT_SUM="0"
ONLY_LIST="0"

# === Confirm that the required commands exist =================================
if type tar >/dev/null 2>&1; then
    :
else
    error_exit 1 'Require the tar command.'
fi

if type openssl >/dev/null 2>&1; then
    ckdgst() {
        cat - |\
            openssl dgst -"${SUM_DGST}" |\
            sed "s/(.*)=[[:blank:]]*\([0-9a-fA-F]*\)/\1/"
    }
elif type md5sum >/dev/null 2>&1; then
    SUM_DGST="md5"
    ckdgst() {
        cat - |\
            md5sum |\
            cut -d " " -f 1
    }
else
    error_exit 1 'Require the openssl command.'
fi

# === Print usage and exit if one of the help options is set ===================
case "$# ${1:-}" in
    '1 -h'|'1 --help'|'1 --version') usage_and_exit;;
esac

# === Read options =============================================================
while :; do
    case "${1:-}" in
        -x)
            PERMIT_EXTRACT="1"
            shift
            ;;
        -c)
            CHECK_SUM=$(printf '%s' "${2:-}" | tr -d '\n')
            shift 2
            ;;
        -l)
            ONLY_LIST="1"
            shift
            ;;
        --archive-template)
            sed '/^cat <<-\"==END\"/ ,$d' "${0}" |\
                sed '$acat <<-\"==END\"' |\
                sed '$a==END'
            exit 0
            ;;
        --|-)
            break
            ;;
        --*|-*)
            error_exit 1 'Invalid option'
            ;;
        *)
            break
            ;;
    esac
done

# === Require parameters check =================================================
# === Last parameter ===========================================================
# === Define funcitons =========================================================
confirm() {
    while true; do
        printf "%s [y/N]\n" "${1:-Do you wish to continue?}" 1>&2
        read -r yn

        case "${yn}" in
            [yY]| [yY]es)
                return 0
                ;;
            *)
                return 1
                ;;
        esac
    done
}

decord() {
    SED_LF=$(printf '\\\n_')
    SED_LF=${SED_LF%_}

    cat - |\
        tr -d "=" |\
        sed "s/[[:blank:]]//g" |\
        tr "01" "<>" |\
        sed "s/./&${SED_LF}/g" |\
        sed "/^$/d" |\
        paste -d "" - - - - |\
        sed "s:/:111111:g" |\
        sed "s:+:111110:g" |\
        sed "s:9:111101:g" |\
        sed "s:8:111100:g" |\
        sed "s:7:111011:g" |\
        sed "s:6:111010:g" |\
        sed "s:5:111001:g" |\
        sed "s:4:111000:g" |\
        sed "s:3:110111:g" |\
        sed "s:2:110110:g" |\
        sed "s:>:110101:g" |\
        sed "s:<:110100:g" |\
        sed "s:z:110011:g" |\
        sed "s:y:110010:g" |\
        sed "s:x:110001:g" |\
        sed "s:w:110000:g" |\
        sed "s:v:101111:g" |\
        sed "s:u:101110:g" |\
        sed "s:t:101101:g" |\
        sed "s:s:101100:g" |\
        sed "s:r:101011:g" |\
        sed "s:q:101010:g" |\
        sed "s:p:101001:g" |\
        sed "s:o:101000:g" |\
        sed "s:n:100111:g" |\
        sed "s:m:100110:g" |\
        sed "s:l:100101:g" |\
        sed "s:k:100100:g" |\
        sed "s:j:100011:g" |\
        sed "s:i:100010:g" |\
        sed "s:h:100001:g" |\
        sed "s:g:100000:g" |\
        sed "s:f:011111:g" |\
        sed "s:e:011110:g" |\
        sed "s:d:011101:g" |\
        sed "s:c:011100:g" |\
        sed "s:b:011011:g" |\
        sed "s:a:011010:g" |\
        sed "s:Z:011001:g" |\
        sed "s:Y:011000:g" |\
        sed "s:X:010111:g" |\
        sed "s:W:010110:g" |\
        sed "s:V:010101:g" |\
        sed "s:U:010100:g" |\
        sed "s:T:010011:g" |\
        sed "s:S:010010:g" |\
        sed "s:R:010001:g" |\
        sed "s:Q:010000:g" |\
        sed "s:P:001111:g" |\
        sed "s:O:001110:g" |\
        sed "s:N:001101:g" |\
        sed "s:M:001100:g" |\
        sed "s:L:001011:g" |\
        sed "s:K:001010:g" |\
        sed "s:J:001001:g" |\
        sed "s:I:001000:g" |\
        sed "s:H:000111:g" |\
        sed "s:G:000110:g" |\
        sed "s:F:000101:g" |\
        sed "s:E:000100:g" |\
        sed "s:D:000011:g" |\
        sed "s:C:000010:g" |\
        sed "s:B:000001:g" |\
        sed "s:A:000000:g" |\
        sed "s/[01][01][01][01][01][01][01][01]/& /g" |\
        sed "s/ [01][01]$//" |\
        sed "s/ [01][01][01][01]$//" |\
        sed "s/^[01][01][01][01][01][01]$//" |\
        sed "s/\([01][01]\)\([01][01][01]\)\([01][01][01]\)/0\1 \2 \3 /g" |\
        sed "s/111/7/g" |\
        sed "s/110/6/g" |\
        sed "s/101/5/g" |\
        sed "s/100/4/g" |\
        sed "s/011/3/g" |\
        sed "s/010/2/g" |\
        sed "s/001/1/g" |\
        sed "s/000/0/g" |\
        tr -d " " |\
        paste -d "" - - - - - - - - |\
        sed 's/.../\\\\&/g' |\
        xargs -n 1 printf
}

slice() {
    sed "1,/^exit/d" "${1}" |\
        sed "/^cat/d" |\
        sed "/^==END/d"
}

# === Main routine =============================================================
if [ "_1" == "_${ONLY_LIST}" ]; then
    slice "${SELF_FULL}" |\
        decord |\
        tar ztf -

    exit 0
fi

SUM=$(slice "${SELF_FULL}" | ckdgst)

if [ "_" != "_${CHECK_SUM}" ] && [ "_${SUM}" == "_${CHECK_SUM}" ]; then
    CORRECT_SUM="1"
elif [ "_" == "_${CHECK_SUM}" ] && confirm "Is the value of ${SUM_DGST} ${SUM} correct?"; then
    CORRECT_SUM="1"
else
    CORRECT_SUM="0"
fi

if [ "_1" != "_${CORRECT_SUM}" ]; then
    error_exit 1 "No correct checksum."
elif [ "_1" != "_${PERMIT_EXTRACT}" ]; then
    error_exit 1 "Does not exist -x option (to permit extracting). More info is gave -h option."
else
    :
fi

mkdir -p "${SELF_DIR}/${SELF_NAME}"

(
    cd "${SELF_DIR}/${SELF_NAME}" || exit 1
    slice "${SELF_FULL}" |\
        decord |\
        tar xzvf -

    if [ -e "autorun.sh" ] && confirm "Do you want to run the autorun.sh script?" ; then
        chmod +x "autorun.sh"
        ./autorun.sh
    fi
)

# === End shell script =========================================================
exit 0
cat <<-"==END" 1>&2
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==END