Excercises Medium. Answers

# Excercises Medium. Answers ## 2. Permissions* #### 1. Find world executable folder :::spoiler :::success find / -perm -o x -type d 2>/dev/null` ::: #### 2. Find world writable files directories :::spoiler :::success find / -writable -type d 2>/dev/null find / -perm -222 -type d 2>/dev/null find / -perm -o w -type d 2>/dev/null ::: #### 3. Find world writable and executable folders :::spoiler :::success find / $ -perm -o w -perm -o x $ -type d 2>/dev/null ::: #### 4. List of last modified/opened/created files on the system :::spoiler :::success Find / -mtime 5 -xdev > modified.txt ::: #### 5. Find all suid files :::spoiler :::success find / -perm -4000 (find all suid files) ::: --- ## 3. Text processing #### 1. Display the names of all users with a last name "Jones" >awkusers.txt :::info Mike Jones John Smith Kathy Jones Jane Kennedy Tim Scott ::: :::spoiler :::success awk '$2 == "Jones" {print $0}' awkusers.txt ::: #### 2. List commands for running processes with a word in their names "systemd" :::spoiler :::success ps -ax | awk '/systemd/ {print $5}' ::: #### 3. Display username, replace quotes, remove the table header >csvex.txt :::info "name","username","phone","password hash" "John Smith","jsmith","555-555-1212",5f4dcc3b5aa765d61d8327deb882cf99 "Jane Smith","jnsmith","555-555-1234",e10adc3949ba59abbe56e057f20f883e "Bill Jones","bjones","555-555-6789",d8578edf8458ce06fbc5bb76a58c5ca4 ::: :::spoiler :::success cut -d',' -f1 csvex.txt | tr -d '"' | tail -n +2 ::: #### 4. Display phone number, cut quotes symbols :::spoiler :::success cut -d',' -f3 csvex.txt | cut -c2-13 | tail -n +2 ::: --- ## 4. Text processing* #### 1. Display the ip address of interface from "ip a s eth0" command :::spoiler :::success ip a s eth0 | awk -F '[\/ ]+' '/inet / {print $3}' ::: #### 2. Replace the ip "10.0.4.35" to "10.0.4.27" from "ips.txt" file >ips.txt :::info ip,OS 10.0.4.2,Windows 8 10.0.4.35,Ubuntu 16 10.0.4.107,macOS 10.0.4.145,macOS ::: :::spoiler :::success sed 's/10\.0\.4\.35/10.0.4.27/g' ips.txt ::: #### 3. Find user passwords using the corresponding hashes from the csv file "csvex.txt" >passwords.txt :::info password,md5hash 123456,e10adc3949ba59abbe56e057f20f883e password,5f4dcc3b5aa765d61d8327deb882cf99 welcome,40be4e59b9a2a2b5dffb918c0e86b3d7 ninja,3899dcbab79f92af727c2190bbd8abc5 abc123,e99a18c428cb38d5f260853678922e03 123456789,25f9e794323b453885f5181f1b624d0b 12345678,25d55ad283aa400af464c76d713c07ad sunshine,0571749e2ac330a7455809c6b0e7af90 princess,8afa847f50a716e64932d995c8e7435a qwerty,d8578edf8458ce06fbc5bb76a58c5c ::: :::spoiler :::success grep "$(awk -F "," '{print $4}' csvex.txt)" passwords.txt ::: --- ## 5. Text processing* #### 1. Display the 7 most frequent IP addresses and print the number of their requests >access.log :::info http://www.almhuette-raith.at/apache-log/access.log ::: :::spoiler :::success cut -d' ' -f1 access log | sort | uniq -c | sort -rn :::