CLI commands drill 2

CLI_drill_12.sh

############################  PIPES #############################################################
# Printing all the data from the url
curl https://raw.githubusercontent.com/bobdeng/owlreader/master/ERead/assets/books/Harry%20Potter%20and%20the%20Goblet%20of%20Fire.txt
# Save all the data from the url to the file harry_potter
curl -o harry_potter https://raw.githubusercontent.com/bobdeng/owlreader/master/ERead/assets/books/Harry%20Potter%20and%20the%20Goblet%20of%20Fire.txt
# Print first three line of the file harry_potter
head -n 3 harry_potter
# Print last 10 line of the file harry_potter
tail -n 10 harry_potter
# find the counts of the Harry in harry_potter -> total words = 2591
grep Harry harry_potter
# find the counts of the Ron in harry_potter -> total words = 947
grep Ron harry_potter
# find the counts of the Hermione in harry_potter -> total words = 822
grep Hermione harry_potter
# find the counts of the Dumbledore in harry_potter -> total words = 507
grep Dumbledore harry_potter
# to get the line from 100 to 200 form harry_potter using sed command
sed -n '100,200p' harry_potter
# to get the line from 100 to 200 form harry_potter using awk command
awk 'NR>=100 && NR<=200' harry_potter
# to get the line from 100 to 200 form harry_potter using head pipe tail command
head -n 200 harry_potter | tail -n 101 
# to get the number of unique words -> total uniq word = 11577
tr -c '[:alnum:]' '\n' < harry_potter | sort | uniq | wc -l

############################  Processes, ports #############################################################
pgrep chrome                            # get the PID of chrome browser   -> PID = 1049
ps -ef | grep chrome                    # get the PPID of chrome browser. -> PPID = 1 PID = 1049
killall "Google Chrome"                 # kill the chrome browser from command line
top -l 1 -o cpu | head -n 15            # run the top 3 cpu process using top command
top -l 1 -o mem | head -n 15            # run the top 3 mem process using top command
cd ~/desktop/linuxlesson                # move to linuxlesson to run the python script
python3 -m http.server 8000             # run the python script on port 8000
pkill -f http.server                    # to kill the http server from different terminal
sudo python3 -m http.server 90               # run the python script on port 90
netstat -an | grep -E 'tcp|udp'         # connection of TCP and UDP simultaneously
cd ~/desktop/linuxlesson                # move to linuxlesson to run the python script
python3 -m http.server 5432             # run the python script on port 5432
sudo netstat -anp tcp | grep 5432       # find the PID of localhost 5432 using netstat PID - 5432
sudo lsof -i :5432                      # this gives me the PID of localhost 5432 -> PID - 10779

############################  Managing software #############################################################
brew install htop          # to install htop from brew
brew install vim           # to install vim from brew
brew install nginx         # to install nginx from brew
brew uninstall nginx       # to uninstall nginx from brew

############################################################# Misc ############################################################
ifconfig | grep "inet"     # gives inet(ipv4) as well as inet6(ipv6)
ping google.com            # gives the ping of the google.com which include ip address
ping google.com            # gives the ping of the google.com which shows my internet is working
which node                 # gives the path of the node
which code                 # gives the path of the code