Linux Modules

Prompts and answers

• Is there a difference between egrep and fgrep? (Yea/Nay)
  Yea
• Which flag do you use to list out all the lines NOT containing the 'PATTERN'?
  -v
• What user did you find in that file?
  bobthebuilder
• What is the password of that user?
  LinuxIsGawd
• Can you find the comment that user just left?
  fs0ciety
• Run tr --help command and tell how will you select any digit character in the string?
  :digit:
• What sequence is equivalent to [a-zA-Z] set?
  :alpha:
• What sequence is equivalent to selecting hexadecimal characters?
  :xdigit:
• Download the above given file, and use awk command to print the following output:
  awk 'BEGIN{FS=" "; OFS=":"} {print $1,$4}' awk.txt
• How will you make the output as following (there can be multiple; answer it using the above specified variables in BEGIN pattern):
  awk 'BEGIN{ORS=", "} {print $1}' awk.txt
• How would you substitute every 3rd occurrence of the word 'hack' to 'back' on every line inside the file file.txt?
  sed 's/hack/back/3g' file.txt
• How will you do the same operation only on 3rd and 4th line in file.txt?
  sed '3,4 s/hack/back/3g' file.txt
• Download the given file, and try formatting the trailing spaces in sed1.txt with a colon(:).
  sed 's/ */:/g' sed1.txt
• View the sed2 file in the directory. Try putting all alphabetical values together, to get the answer for this question.
  CONGRATULATIONS YOU MADE IT THROUGH THIS SMALL LITTLE CHALLENGE
• What pattern did you use to reach that answer string?
  's/[[:digit:]]//g'
• What did she sed?(In double quotes)
  "That's What"
• Take argument as "files"
  cat file | xargs -I files -t sh -c "touch files; chmod 400 files"
• You can find the files for this task in two folder.
  ls | xargs -I word -n 1 -t sh -c 'echo word >> shortrockyou; rm word'
• Which flag to use to specify max number of arguments in one line.
  -n
• How will you escape command line flags to positional arguments?
  --
• Download the file given for this task, find the uniq items after sorting the file. What is the 2271st word in the output.
  lollol
• What was the index of term 'michele'
  2550
• Which flag allows you to limit the download/upload rate of a file?
  --limit-rate
• How will you curl the webpage of https://tryhackme.com/ specifying user-agent as 'juzztesting'
  curl -A 'juzztesting' https://tryhackme.com/
• Can curl perform upload operations?(Yea/Nah)
  Yea
• How will you enable time logging at every new activity that this tool initiates?
  -N
• What command will you use to download https://xyz.com/mypackage.zip using wget, appending logs to an existing file named "package-logs.txt"
  wget -a package-logs.txt https://xyz.com/mypackage.zip
• Write the command to read URLs from "file.txt" and limit the download speed to 1mbps.
  wget -i file.txt --limit-rate=1m
• How will you seek at 10th byte(in hex) in file.txt and display only 50 bytes?
  xxd -s 0xa -l 50 -b file.txt
• How to display a n bytes of hexdump in 3 columns with a group of 3 octets per row from file.txt? (Use flags alphabetically)
  xxd -c 9 -g 3 file.txt
• Which has more precedence over the other -c flag or -g flag?
  -c
• Download the file and find the value of flag.
  flag{wh3sdw0lw1gl9oqasad2fs48as}
• It's safe to run systemctl command and experiment on your main linux system neither following a proper guide or having any prior knowledge? (Right/Wrong)
  Wrong
• How will you import a given PGP private key. (Suppose the name of the file is key.gpg)
  gpg --import key.gpg
• How will you list all port activity if netstat is not available on a machine? (Full Name)
  Socket Statistics
• What command can be used to fix a broken/irregular/weird acting terminal shell?
  reset
• Press F to pay respect
  F