unix linux commands bash scripts, run in background, kill process in linux

linux scripts commands.md

Linux commands

How to know which process is using port

# port 9600 
sudo lsof -i :9600

How to kill a process

sudo kill 41789

How to run .sh file

sh index.sh

How to see all processes running and kill them

# check processes 
ps -aux|grep <process-name>

# kill a process
kill -9 <process-id>

# check all fluent-bit process
ps -aux|grep fluent-bit

# kill fluent-bit instance
kill -9 <process-id>

# note process is killed

Sample .sh file

Create new file index.sh add below code

#!/bin/sh
echo "Hello World"

Give file permission to execute file

sudo chmod +x ./index.sh

Run script on background

sudo nohup ./index.sh &

Rename a file

mv oldfile.txt newfile.txt

Delete directory

Use the rmdir or rm -d command to remove empty directories. Use the rm -r command to remove non-empty directories.

Delete everything except one folder

delete all except ad-demo folder

ls /data/ | grep -v "ad-demo" | xargs rm -r

Download Tar File

curl -s https://artifacts.elastic.co/downloads/logstash/logstash-8.7.1-linux-x86_64.tar.gz | tar xz

copy folder

cp -R path_to_source path_to_destination/

copy file to another folder

cp ./DirectoryA_1/README.txt ./DirectoryA_2

Create .sh or bash fiile

add this line on the top of the .sh file #!/bin/bash

How do I shorten the current directory path shown on terminal?

PROMPT_DIRTRIM=1