Linux Enumeration Tips

Default Ubuntu File Permissions

* Folders should be 0755
* Files shuld be 0664
find /home/user -type d -print0 | xargs -0 chmod 0775
find /home/user -type f -print0 | xargs -0 chmod 0664

Hold / Unhold Updates

sudo apt-mark hold <package-name>
sudo apt-mark unhold <package-name>
sudo apt-mark showhold

Grep all file for string

grep -ilR "flag11" / 2>/dev/null

Remove all newline space from file

tr -d "\n\r" < yourfile.txt

Remove specific character or space from Nano

ctrl + \
search the file _char
replace the file _char
choose option

Find SUID Files

find / -perm -u=s -type f 2>/dev/null

cat not working

Have you tried less?

Convert all UPPER to lower or lower to UPPER

cat TEXT or filename.txt | tr [:upper:] [:lower:]

Send Email Message with Attachment

sendemail -t nico@megabank.com -f badguy@ph0enix.local -s reel.htb.local -u RTF -m "Important" -a invoice.rtf

Mount a VHD Drive

• ```--add`` is the name of the file

mkdir /mnt/vhd
sudo guestmount --add 9b9cfbc4-369e-11e9-a17c-806e6f6e6963.vhd --inspector --ro -v /mnt/vhd