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kpodp0ra / sciaga.md
Last active June 1, 2025 15:10
🐚 Bash dla ludzi: praktyczna ściąga do pisania skryptów

Wypisywanie tekstu

echo "Hello, World!"
echo -n "Hello, World!"  # Brak nowej linii na końcu, przydatne w pipach

echo $'Nowa\nLinia'  # Wsparcie znaków specjalnych, np. \n

# kotek albo conCATination — wyświetla zawartość pliku albo łączy dwa pliki
cat nazwapliku
@kpodp0ra
kpodp0ra / safety_check.sh
Last active April 27, 2023 20:04
Bash script that displays various system information related to security like open ports and fail2ban configuration.
#!/bin/bash
echo "MOTD:"
cat /etc/issue.net
echo
# List fail2ban jails
echo "Fail2ban jails:"
fail2ban-client status | grep 'Jail list:' | sed 's/ //g' | cut -d: -f2
echo
@kpodp0ra
kpodp0ra / wait_for_clock.py
Last active July 30, 2022 10:13
Helper asynchronous function that waits until clock hits specified hour
import asyncio
import datetime
def wait_for_clock(hour, minute, result=None):
t = datetime.datetime.combine(
datetime.date.today(),
datetime.time(hour, minute)
)
@kpodp0ra
kpodp0ra / cloudflare.sh
Last active March 12, 2022 18:53
Bash script for whitelisting cloudflare ips as well as setting nginx config to show real ips. Forked from: https://github.com/oasisfleeting/cloudflare-whitelister-nginx-real-ip
#!/bin/bash
echo "#Cloudflare" > /etc/nginx/conf.d/00_real_ip_cloudflare_00.conf;
iptables -D INPUT -j cloudflare;
iptables -F cloudflare;
iptables -X cloudflare;
iptables -N cloudflare;
for i in `curl https://www.cloudflare.com/ips-v4`; do
iptables -A cloudflare -p tcp -m multiport --dports http,https -s $i -j ACCEPT;
echo "set_real_ip_from $i;" >> /etc/nginx/conf.d/00_real_ip_cloudflare_00.conf;