Add Bash

Bash.md

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+
+## Running multiple commands at once 
+```bash
+{ cmd() { printf "\n# %s\n" "$*"; "$@"; }; \
+    cmd dig MX example.com +short; \
+    cmd dig TXT example.com +short; \
+    cmd dig TXT _dmarc.example.com +short; \
+    cmd dig TXT *._domainkey.example.com +short; \
+    } 2>&1
+```
+
+## Looping through commands with list of items
+```bash
+while read ip; do
+  sudo ufw allow in on eth0 from $ip to 192.0.2.0/24 port 80 proto tcp
+  sudo ufw allow in on eth0 from $ip to 192.0.2.0/24 port 443 proto tcp
+done < whitelist.txt
+```
+---
+
+```bash
+#!/bin/bash
+
+while read domain; do
+    echo "$domain"
+    dig MX $domain +short
+    dig TXT $domain +short
+    dig TXT _dmarc.$domain +short
+    dig TXT *._domainkey.$domain +short
+    echo ""
+done < domain-list.txt
+```
+
+## Show counter for unique lines
+```bash
+sort file.txt | uniq -c | sort -nr
+```