myfirstshell.sh

#!/bin/bash

# a)
# name:        lazydog
# filename:    myfirstshell.sh
# description: of no sense

export SCRIPTNAME="$(cd "$(dirname $0)"; echo "$PWD/$(basename $0)")"

bash -s <<-'EOF'
    perl -mPOSIX=strftime -E "$(perl -CSDA -pe \
        's/^\s*\K#([a-z]+ \(.*?\))\)/say \"\n========== $1 ==========\";/g' <<'EOS'
        #b (greeting))
        $users = `cut -d: -f1 /etc/passwd`;
        chomp($cur_user = `grep -Po '^# name:\\s*\\K.*' $ENV{SCRIPTNAME}`);
        say +($users =~ $cur_user) ? "Hello! $cur_user" : "Fuck you, $cur_user!";

        #c (date & time))
        say strftime('%Y-%m-%d %T', localtime);

        #d (calendar))
        system('cal');

        #e (machine name))
        system('hostname');

        #f (operation system & version))
        system(q{grep -Pwo '(NAME|VERSION)="\K[^"]+' /etc/os-release |
                 sed '1s/^/operation: /; 2s/^/version: /'});

        #g (file in parent path))
        system('ls ..');

        #h (processes ownered by root (keep 10 items))
        system(q{ps -ef | awk '/^root/&&$8!~/^\[/' | head -10});

        #i (env value: TERM PATH HOME))
        say "$_: @{[$ENV{$_} =~ s/:/\n      /gr]}" for qw[TERM PATH HOME];

        #j (disk usage))
        system('df -h');

        #k (group id))
        system('id -g');

        #m (bye))
        system(q#
        python -c 'print("".join(chr(int([x[8:] + x[:8] for x in [format(((
        int(__import__("math").sqrt(((1 << 64) - 1) ^ int("".join(list(map(
        lambda x: "".join(x),zip(*[iter(b)] * 8)))[::-1]), 2))) >> 8) & ((1
        << 16) - 1)), "016b")]][0][::-1], 2))for b in map("".join,zip(*[
        iter([s1[(len(s1) % 64) // 2:(len(s1) - (len(s1) % 64 -(len(s1) % 64)
        // 2))]for s1 in ["".join("""
        ○ ● ● ● ● ○ ● ● ● ● ○ ● ● ● ● ● ● ● ○ ● ● ● ●
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        ● ○ ○ ○ ● ● ● ● ● ● ○ ● ● ● ○ ● ● ● ● ● ● ● ●
        ● ○ ○ ○ ● ● ● ○ ● ○ ○ ● ● ○ ○ ● ● ● ● ● ● ○ ○
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        ● ○ ○ ○ ● ● ● ● ○ ○ ● ● ● ○ ● ○ ● ● ○ ● ● ○ ○
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        ● ○ ○ ● ● ○ ● ○ ● ○ ● ● ○ ● ○ ● ● ● ● ○ ● ● ●
        ● ○ ○ ● ○ ● ○ ○ ○ ● ● ○ ○ ● ○ ● ● ● ● ○ ● ● ○
        ○ ● ● ○ ● ● ○ ● ● ● ● ● ○ ● ● ○ ○ ● ○ ○ ● ○ ○
        ○ ● ○ ● ○ ● ○ ○ ○ ○ ● ● ○ ● ● ● ● ● ● ● ● ● ○
        ● ● ● ● ● ○ ● ○ ○ ● ● ○ ● ● ○ ● ○ ○ ● ○ ● ● ●
        ○ ○ ○ ○ ● ● ● ● ○ ● ● ● ○ ○ ○ ○ ○ ● ○ ● ● ○ ●
        ○ ● ● ○ ○ ● ● ○ ● ○ ● ○ ○ ● ● ○ ● ○ ○ ● ● ○ ○
        ○ ○ ● ○ ○ ○ ● ○ ○ ○ ● ● ● ○ ● ● ● ○ ● ○ ○ ○ ○
        ○ ● ● ● ○ ● ○ ● ● ● ● ● ● ● ● ● ● ● ○ ○ ○ ● ●
        """.strip().split("\n")[::-1]).replace(" ", "").translate(
        str.maketrans(dict(zip("○●", "01"))))]][0])] * 64))))'
        #);

    EOS
)"
EOF