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OS Week 02 Assignment #6: Finishing

• Update your “links.md” file. For e.g., see cbkadal’s https://cbkadal.github.io/os232/LINKS/
  • See also last week assignment.
• Replace the content of “TXT/myupdate.txt” inside your “os232” repository.
  • Upto 24 hours after the Week 02 deadline, the content of “myupdate.txt” should be:
    • OS232W02 (ALL CAPITAL LETTERS!)
    • When submitting the weekly assignments, the content of “TXT/myupdate.txt” should match the week of the assignment. I.E., OS232W01 for WEEK01, OS232W02 for WEEK02, and beyond. Without a proper “TXT/myupdate.txt,” your assignment grade will be significantly reduced.
  • For e.g., see cbkadal’s https://cbkadal.github.io/os232/TXT/myupdate.txt
• Update “mylog.txt”. For e.g., see cbkadal’s https://cbkadal.github.io/os232/TXT/mylog.txt
• Write script “myscript.sh” or copy https://cbkadal.github.io/os232/TXT/myscript.sh. The use of the script is as follows:
  • Report WEEK02
  • Encrypt the content of folder “$HOME/RESULT/W02/” into TARBALL “myW02.tar.xz.asc”
  • Create checksum file “SHA256SUM” of folder “$HOME/git/os232/TXT/”
  • Signing checksum to file “SHA256SUM.asc”
  • You are not cbkadal! What is YOUR public-key ID? READ the script, before using cbkadal’s “myscript.sh”!
  • REC2 is cbkadal’s public key ID. Replace REC2 with your Public Key ID!

# ####################### Replace REC2 ####
REC2="60914D29C01C81F1"
# ####################### ####### #### ####

• For WEEK02, run and confirm WEEK02:
  • Make sure that all SHA CHECKSUMS are “OK”, and verify “gpg: Good signature”.

bash myscript.sh 2

(RESULT)

$ bash myscript.sh 2

Is this WEEK W02 ? [y/N] y

~/RESULT ~/git/os232/TXT
removed 'myW02.tar.xz'
tar cfj myW02.tar.xz W02/
gpg --armor --output myW02.tar.xz.asc --encrypt --recipient XYZZYXYZZYXYZZYZ --recipient XYZZYXYZZYXYZZYZ myW02.tar.xz
~/git/os232/TXT
Check and move /home/cbkadal/RESULT/myW02.tar.xz.asc...
renamed '/home/cbkadal/RESULT/myW02.tar.xz.asc' -> './myW02.tar.xz.asc'
rm -f SHA256SUM SHA256SUM.asc
sha256sum my*.asc my*.txt my*.sh > SHA256SUM
# ################ CHECKSUM ###### #########
sha256sum -c SHA256SUM
myW02.tar.xz.asc: OK
mylog.txt: OK
mypubkey.txt: OK
myrank.txt: OK
myupdate.txt: OK
myscript.sh: OK
# ################# SIGNING CHECKSUM ######### ######### ########
gpg --output SHA256SUM.asc --armor --sign --detach-sign SHA256SUM
# ################# VERIFY ######### ######### ######### ########
gpg --verify SHA256SUM.asc SHA256SUM
gpg: Signature made Mon 12 Sep 2022 05:35:59 PM WIB
gpg:                using RSA key XYZZYXYZZYXYZZYXYZZYXYZZYXYZZYXYZZYXYZZY
gpg: Good signature from "Cicak Bin Kadal (CBK) <cbkadal@localhost>" [ultimate]

==== ==== ==== ==== ==== ==== ==== ==== ==== ==== ==== ====
==== ==== ==== ATTN: is this WEEK W02 ?? === ==== ==== ====
==== ==== ==== ==== ==== ==== ==== ==== ==== ==== ==== ====

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