Linux Commands

# lihat waktu UTC lokal dan internet
date -d "$(curl -sI google.com| grep -i '^date:'|cut -d' ' -f2-)"
date -u -d "$(curl -sI google.com | grep -i '^date:' | cut -d' ' -f2-)"

# figure out the process id (pid)
netstat -tulp | grep kubectl

# kill application
sudo kill <<PID>>

# no hangup
nohub

# open port di firewall
sudo firewall-cmd --permanent --add-port=80/tcp

# melihat list port di firewall
sudo firewall-cmd --list-port

# remove port
sudo firewall-cmd --remove-port=6379/tcp --permanent

# restart service firewall
sudo firewall-cmd --reload

# Check os version in Linux
# debian
cat /etc/os-release
lsb_release -a
# CentOs
hostnamectl

# kernel version
uname -r

# another option
cat /proc/version
cat /etc/issue
more /etc/issue
less /etc/issue

# The procedure to run the .sh file shell script on Linux is as follows:
# Set execute permission on your script:
chmod +x script-name-here.sh
#To run your script, enter:
./script-name-here.sh
# OR
sh script-name-here.sh
# OR
bash script-name-here.sh

# pemberian hak akses readwrite direktori, default tidak recruisive tambahkan -R untuk recruisive
chmod -R 0777 /mydirectory
chmod -R 0755 /my-cool-directory

# view free disk
df -h
df -a #shows the file system's complete disk usage even if the Available field is 0

# melihat memory
free -m
cat /proc/meminfo
vmstat -s
top

# restart linux
sudo reboot
shutdown -r +5

# echo dari file
echo "$(<a.txt )"

# melihat info cpu
cat /proc/cpuinfo
# melihat jumlah thread cpu
nproc --all
echo "Threads: $(nproc --all)"
# melihat dari konfigurasi
getconf _NPROCESSORS_ONLN
echo "Number of CPU/cores online at $HOSTNAME: $(getconf _NPROCESSORS_ONLN)"
# socket, core cpu dll
lscpu
# contoh hasil
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                8
On-line CPU(s) list:   0-7
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             8
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 85
Model name:            Intel(R) Xeon(R) Platinum 8170 CPU @ 2.10GHz
Stepping:              4
CPU MHz:               2095.078
BogoMIPS:              4190.15
Hypervisor vendor:     VMware
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              1024K
L3 cache:              36608K
NUMA node0 CPU(s):     0-7
# diringkas
lscpu | grep -E '^Thread|^Core|^Socket|^CPU\('

# unzip
# extract to mydir
unzip wer.zip -d mydir
# silent mode (-q perform  operations  quietly  (-qq  = even quieter))
unzip -qq wer.zip

# zip, jangan sertakan / di belakang direktori
 zip -r nginx.zip nginx