drwxr-xr-x 8 root root 4096 Dec 14 2017 SMB and RPC Enumeration Web Enumeration Linux PrivEsc Linux Commands DDoS SMB TL;DR You can grab and parse these commands from this page using cURL:
curl -s https://harfordcda.neocities.org/passive_recon.html | sed 's/<[^>]*>//g ; /^$/d'| tr -s '\n' '\n' | sed -r /^r?$/d > passive_recon
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Type help for a list of interactive commands.
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Locating sub-domains
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#theHarvester
git clone https://github.com/laramies/theHarvester && cd theHarvester
theHarvester -d domain -b all
#Amass
#https://github.com/OWASP/Amass/blob/master/CONTRIBUTING.md
amass enum -passive -d domain -src -o subs.txt
#sublist3r
git clone https://github.com/aboul3la/Sublist3r
python sublister.py -d site
#Subbrute
git clone https://github.com/TheRook/subbrute && cd subbrute
./subbrute.py target.com
#Using Google Dorks
site:target.com -site:target.com
site:*.target.com
#Third Party Sites
www.dnsdumpster.com
https://pentest-tools.com/information-gathering/find-subdomains-of-domain
https://www.robtex.com/
#Additional Tools
#Assetfinder
go get -u github.com/tomnomnom/assetfinder
assetfinder target.com > subs.txt
#Findomain
#https://github.com/Findomain/Findomain
wget https://github.com/Findomain/Findomain/releases/download/5.0.0/findomain-linux -O findomain
chmod +x findomain
./findomain -t target.com -u subs.txt
#Knockpy
git clone https://github.com/guelfoweb/knock.git
cd knock/
sudo python setup.py install
python knockpy.py target.com
#Subfinder
#https://github.com/projectdiscovery/subfinder
GO111MODULE=on go get -v github.com/projectdiscovery/subfinder/v2/cmd/subfinder
subfinder -d target.com -o subs.txt