Devops/devops_linux_cli_cheat_sheet.txt at 8ce41142f034fe9b4ff8a0d7eb3607e24013a2b3 · iamdevdhanush/Devops · GitHub

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DEVOPS LINUX CLI CHEAT SHEET (FOUNDATIONS)
========================================

NAVIGATION
pwd        - current directory
ls         - list files
ls -la     - detailed list
cd dir     - change directory
cd ..      - move up
cd ~       - home directory

FILES & DIRECTORIES
touch f          - create file
mkdir d          - create directory
mkdir -p a/b     - nested directories
rm f             - delete file
rm -r d          - delete directory
rm -rf d         - force delete (danger)
cp a b           - copy
cp -r a b        - copy directory
mv a b           - move / rename

VIEW FILES & LOGS
cat f            - show file
less f           - scroll file
head f           - first lines
tail f           - last lines
tail -f log      - live logs
wc f             - count lines/words

SEARCH & TEXT
grep err f
grep -r err .
grep -i err f
grep -v debug f
awk '{print $1}' f
sed 's/a/b/g' f
cut -d: -f1 f
sort | uniq

PERMISSIONS
chmod 755 f
chmod 644 f
chown user f
chgrp group f
ls -l
whoami
id

USERS
useradd u
userdel u
usermod -aG g u
passwd u
su u
sudo cmd
who
last

DISK
df -h
du -sh d
lsblk
mount
umount

FIND
find / -name f
find . -size +1G
which python
whereis nginx

NETWORK
ip a
ip route
ping host
curl url
wget url
ss -tulnp
hostnamectl

PROCESSES
ps aux
top
htop
free -h
uptime
kill PID
kill -9 PID

ARCHIVES
tar -czf a.tgz d
tar -xzf a.tgz
zip -r a.zip d
unzip a.zip

REDIRECTION
cmd > out
cmd >> out
cmd 2> err
cmd > out 2>&1
cmd | grep x
cmd | tee f

SERVICES
systemctl status svc
systemctl start svc
systemctl stop svc
systemctl restart svc
systemctl enable svc
journalctl -u svc
journalctl -f

SSH
ssh u@ip
ssh-keygen
ssh-copy-id u@ip
scp f u@ip:/path
rsync -avz a/ b/

DOCKER
docker ps
docker images
docker run img
docker exec -it ctr bash
docker logs ctr
docker build -t img .
docker pull img
docker push img

RULE:
Cheat sheet helps memory.
Practice builds skill.