Notes |

General notes that I may need in future and I don’t know where to put them in Notes.app 📝

Shell Commands

ZSH (oh-my-zsh)

cd to history
```
  $ dirs -v
  $ cd -<TAB>
```

SSH

show ssh key fingerprint:
```
  $ ssh-keygen -lf .ssh/id_rsa.pub
```

generate keys:

  $ ssh-keygen -f ~/keyfile -t ecdsa -b 521

SHELL/BASH

add prefix to the beginning of a line

  # If you want to edit the file in-place
  $ sed -i -e 's/^/prefix/' file
  # If you want to create a new file
  $ sed -e 's/^/prefix/' file > file.new

read file by line

  while IFS= read -r line
    do
    # script
  done < file.txt

grep and display only requested string/regex

  $ grep -Po 'Your support ID is: [0-9]+'

run a simple http server
```
  python3 -m http.server --cgi 8080
```

Makefile

basic syntax:
```
  build:
  <TAB>command
  <EMPTY LINE>
```
Check whether the TAB are correctly set:
```
  cat -e -t -v makefile_name
```

VIM

Integrate with system clipboard:
- copy selected part: visually select text(type v or V in normal mode) and type :w !pbcopy
- copy the whole file :%w !pbcopy
- paste from the clipboard :r !pbpaste

cURL

Resolve a hostname to custom IP:

  $ curl --resolve lubos.klokner.sk:443:127.0.0.1 https://lubos.klokner.sk/

Do not check the certificate:
```
  $ curl -k https://lubos.klokner.sk/
```

Read data from a file:

  # file.txt: param1=value1&param2=value2
  $ curl -G 'http://example.com/' -d @file.txt
  $ curl -G 'http://example.com/' --data-urlencode @file.txt

Send Cookie:

  $ curl -b 'flag6=COOKIE_VALUE8; expires=Mon, 2 Aug 2021 20:20:20 UTC; path=/' https://lubos.klokner.sk/

VSCODE

Multi-Line editing:  + fn + f2
Duplicate lines of code in both directions: shift + alt + arrow up/down
Move line: alt + arrow up/down
Comment:  + /

macOS

VMware Fusion

Fix networking issues:

  $ sudo /Applications/VMware\ Fusion.app/Contents/Library/vmnet-cli --stop
  $ sudo /Applications/VMware\ Fusion.app/Contents/Library/vmnet-cli --start

Networking

Allow packet forwarding:

  $ sudo sysctl -w net.inet.ip.forwarding=1

tcpdump

grep in the network stream:

  $ sudo tcpdump -A -l dst port 80 | grep "^Cookie:"

Docker

Markup Cheat Sheet

F5 BIG-IP

tcpdump:

  $ tcpdump -vvv -nni 0.0:nnn "(host [client_ip] and host [VS_ip]) or host [pool_member_ip]" -s0 -w /var/tmp/case_description.pcap

license from CLI:

  $ get_dossier -b "base key" -a "actkey1,actkey2"
  # goto -> https://activate.f5.com & paste the dossier here
  # copy the license from the webpage
  $ cat - > /config/bigip.license
  # CTRL + D
  $ reloadlic

reset to factory defaults (v13.0+):

  # tmsh load /sys config default
  # tmsh save /sys config partitions all