Backend Notes JUL 5, 2024 • 03 MIN READ

LIST COMMAND
IN LINUX
I OFTEN USE

Abstract technical background

Command Linux I often use. I write here because I'm forgetful :'(

List command

Check used and free space storage:

chmod +x ${PATH_FILE}

Check port firewall open:

firewall-cmd --list-port

Check port active/used:

sudo netstat -tulpn | grep LISTEN

View file use less:

less ${PATH_FILE}
shift + g -> jump to latest line
q -> exit view mode

View file use vi:

vi ${PATH_FILE}
esc + :q -> jump to latest line
esc + :wq -> exit view mode

Crontab:

crontab -l -> view list cronjob
crontab -e -> add, edit, update, delete

Open Firewall:

sudo firewall-cmd --zone=public --add-port=${PORT}/tcp --permanent
sudo firewall-cmd --reload
sudo firewall-cmd --list-port
sudo systemctl restart firewalld.service

Change version java in Mac:

/usr/libexec/java_home -V
export JAVA_HOME=`/usr/libexec/java_home -v 18.0.2`

Update ID Sequence to latest:

SELECT MAX(id) FROM table_name;
SELECT setval('"table_name_id_seq"', (SELECT MAX(id) FROM table_name)+1);

Sample

SELECT setval('configuration.config_shared_property_id_seq', (SELECT MAX(id) FROM "configuration".config_shared_property)+1);

Update Javac to same version java:

sudo yum install java-17-openjdk-devel

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