mw866

https://regex101.com/ https://regexr.com/

abc…	Letters
123…	Digits
\d	Any Digit
\D	Any Non-digit character
.	Any Character
\.	Period
[abc]	Only a, b, or c

mw866

gcloud version
gcloud components list
gcloud components update
gcloud compute instances list --filter user
gcloud compute scp --recurse user@user-slowhttptest:/home/user/httpbin.csv.html ~/Desktop

gcloud auth list
gcloud config list account

mw866

https://iterm2.com/documentation-utilities.html 
#  Displays the image inline. 
imgcat filename

#  Shows a directory listing with image thumbnails
imgls

# Checks if the terminal is iTerm2
it2check

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## Validate Bind file
named-checkzone example.com example.com.zone

# Get DNSKEY (KSK & ZSK)
dig example.com +rrcomments -t DNSKEY
# Test DNSSEC resolution
delv www.example.com +multi +vtrace

# Get DNSKEY in bulk
dig -f zones.txt  +noall +answer -t dnskey @1.1.1.1 > dnskey.txt

mw866

sudo snap install certbot-dns-cloudflare
sudo certbot certonly \
  --dns-cloudflare \
  --dns-cloudflare-credentials ~/cloudflare.ini \
  --dns-cloudflare-propagation-seconds=300  \
  -d chriswang.me -d "*.example.com"

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## MTR on TCPO:80 
sudo mtr -zrntwP 80 www.example.com

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ab -k -n 1000 -c 5 -g output.tsv -H "x-test: RL" http://www.example.com/status/200
ab -n 10000 -c 5 https://www.example.com

mw866

## To hard reset a single file to HEAD:
git checkout @ -- myfile.ext

## Unstage an added file in Git
git reset HEAD path/to/file

## Check staged differences
git diff --cached

mw866

# [MP4] Inspect Atomic structure 
 AtomicParsley --version 
 AtomicParsley example.mp4 -T 1
  

mw866

# Ubuntu
# Add users
sudo adduser newuser

# Delete users
sudo deluser newuser

# Show users
less /etc/passwd
getent passwd