mac terminal cheat

There are several useful commands, similar to *nix commands for checking wht ports are open

# lsof = list open files
lsof -i -P | grep -i "listen"

lsof -nP +c 15 | grep LISTEN
- n for numeric ip addresses (i.e. do not resolve DNS names)
- P for numeric port numbers
- +c 15 limit output to 15 character wide column

lsof -h   # to list all available options for lsof

lsof -PiTCP -sTCP:LISTEN

lsof -nP -i4 | grep LISTEN
- i4  to list only ipv4 addresses

netstat -tuln  (p option for linux hosts, but not for mac osx)
netstat -anv
netstat -anv | grep 69

netstat -Watnlv  # gives lots of output. so:
netstat -Watnlv | 

scutil --dns | grep 'nameserver\[[0-9]*\]' at the command line. Should give you a list of DNS servers configured on your system.

Typically local apps are in /usr/local as well as a few others

• ~/.local
• /Applications/
• /Library/
• ~/Library

Sometimes you may get an error trying to remove a applications from /Applications/ directory. You might have to sudo chflags and set the noschg flag on the /Applicsaitons/xyz.app file before you can sudo rm xyz.app

See man chflags.

All keys are in ~/.ssh but those are for the ssh client. For sshd you use the same keys. ?

The command $ ssh-add -L gave me an error The agent has no identities. But it is intended to list the keys. Same error for ssh-add -l

ls -al ~~/.ssh should show you al your keys. The remote keys are stored in known_hosts, your pubic key is id_rsa.pub and your private key is id_rsa

Once your macbook is running the scp/sftp daemon, you can use that as the destination for a copy command from a cisco router

On the router:

#copy running-config scp://username:password123G@10.128.16.125//running-config.txt
#copy running-config scp://zintis:######@192.168.11.54/r0-running-config

Or you can skip alot of the command line values and let the router prompt you for:

• remote address
• destination username
• destination filename
• password # this is actually prompted by the scp server when the scp connection is opened.

In which case you enter just #copy running-config scp: Either way works well.

Yes you can config a router to act as an scp server as well. Follow these steps:

1. enable
2. configure terminal
3. aaa new-model
4. aaa authentication login {default | list-name} method1[method2...]
5. aaa authorization {network | exec | commands level | reverse-access | configuration} {default | list-name} [method1 [method2...]]
6. username name [privilege level]{password encryption-type encrypted-password}
7. ip scp server enable   

You can start and stop services using launchctl. For example to start tftp daemon, do this:

sudo launchctl load -F /System/Library/LaunchDaemons/tftp.plist

-F specifies the plist file to load. the plist file for tftp on my mac is:

 <?xml version="1.0" encoding="UTF-8"?>
   <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
   <plist version="1.0">
   <dict>
           <key>Disabled</key>
           <true/>
           <key>Label</key>
           <string>com.apple.tftpd</string>
           <key>ProgramArguments</key>
           <array>
                   <string>/usr/libexec/tftpd</string>
                   <string>-i</string>
                   <string>/private/tftpboot</string>
           </array>
           <key>inetdCompatibility</key>
           <dict>
                   <key>Wait</key>
                   <true/>
           </dict>
           <key>InitGroups</key>
           <true/>
           <key>Sockets</key>
           <dict>
                   <key>Listeners</key>
                   <dict>
                           <key>SockServiceName</key>
                           <string>tftp</string>
                           <key>SockType</key>
                           <string>dgram</string>
                   </dict>
           </dict>
   </dict>
   </plist>

/System/Library/LaunchDaemo

say "It is 12 o'clock.  Do you know where your parents are?"

security is the command line interface to keychains and the security framework. Some useful commnds are:

Show me all my wifi passwords

security find-generic-pssword -wa Wifi
#+END_SRC~

Here is a list of all the security commands available (see ~man security~)

|------------------------+--------------------------------------------|
| list-keychains         | display or manipulate keychain search list |
|------------------------+--------------------------------------------|
| set-keychain-password  | useful when you changed your login passwd  |
|                        | and want your keychain passwed to match    |
|------------------------+--------------------------------------------|
| show-keychain-info     | obvious                                    |
|------------------------+--------------------------------------------|
| show-keychain-info     | obvious                                    |
|------------------------+--------------------------------------------|
| add-generic-pasword    | to keychain?  where does it add to?        |
|------------------------+--------------------------------------------|
| find-generic-password  | good to look up keychain entries quickly   |
|------------------------+--------------------------------------------|
| find-internet-password | ditto                                      |
|------------------------+--------------------------------------------|

For example, to show you what the wifi password for an SSID, try this:
#+BEGIN_SRC python
security find-generic-password -wa "Thunders"

(you will be prompted to enter a userid/password obviously)

See man security find-generic-password

To get weather in your terminal.

curl wttr.in
curl wttr.in/YYZ
curl wttr.in/Ottawa
curl wttr.in/Smiths-Falls
curl wttr.in/moon

To encode any text into a qrcode, so you can then easily open that long text in a smartphone, without having to cut and paste etc.

curl qrenco.de

echo "There are only 60 and 67 days til deer and moose season openers." | curl -F-=\<- qrenco.de 

curl cht.sh/python/write+json+file
curl cht.sh/python/write+json+file\?Q   # same thing without comment lines.

curl cht.sh/python/write+yaml\?Q   # same thing without comment lines.

    curl cht.sh/python/write+json+file
  # queries "write json file" in python under stackoverflow website

  # got me this output:
  $ (U! master) curl cht.sh/python/write+json+file
#  You forgot the actual JSON part - `data` is a dictionary and not yet
#  JSON-encoded. Write it [like this][1] for maximum compatibility
#  (Python 2 and 3):

 import json
 with open('data.json', 'w') as f:
     json.dump(data, f)

#  On a modern system (i.e. Python 3 and UTF-8 support), you can write a
#  nicer file with

 import json
 with open('data.json', 'w', encoding='utf-8') as f:
     json.dump(data, f, ensure_ascii=False, indent=4)

  #  [1]: https://docs.python.org/3/library/json.html
#  
#  [phihag] [so/q/12309269] [cc by-sa 3.0]

First pick a language, say python, then a topic, say lambda

curl cheat.sh/pyhton/lamda

Can take STDIN and stores it to your clipboard. for example, to copy the local weather from the Wego online utility to your clipboard:

curl wttr.in | pbcopy
# or just plain
curl wttr.in/YYZ
curl wttr.in/Ottawa
curl wttr.in/Smiths-Falls
curl wttr.in/moon

After piping to pbcopy you can paste that into notes or anywhere, like messages…

Obviously included in this example is curl wttr.in which shows local weather.

(usually Cmd-v that pastes with all the formatting included)

For example to change the default screen capture file name you can:

defaults write com.apple.screencapture name "capture-"

Then you will see screencaptures savad as capture 2023-08-02 at 5.13.39 PM

Everything you downloaded is in a sql lite database on your mac.

To see it enter:

sqlite3 ~/Library/Preferences/com.apple.LaunchServices.QuarantineEventsV* 'select LSQuarantineDataURLString from LSQuarantineEvent'

# convenient to remove blank lines with
sed "/^$/d ; /^ *#/d"

# and count the lines with
wc -l

# in two steps, via a file called "junk"

sqlite3 ~/Library/Preferences/com.apple.LaunchServices.QuarantineEventsV* \
  'select LSQuarantineDataURLString from LSQuarantineEvent' > junk

sed "/^$/d ; /^ *#/d" junk | wc -l

To clear the downloads list:

sqlite3 ~/Library/Preferences/com.apple.LaunchServices.QuarantineEventsV* \
   'delete from LSQuarantineEvent'

To get a quick look of a file use:

qlmanage -p ~/Desktop/capture-my-file.png

To set a timer or alarm on the terminal to when you want to leave, use:

leave 13:25

When installing from a trusted source, that is not yet registered as a trusted source , you can kill the gatekeeper with:

sudo spctl --master-disable

Just bigger, but both do the same ascii art from text.

It is very easy to run a web server using python3:

python3 -m http.server

C-c to shutdown the server

Then a local user can browse to http://[::]:8000 and see & download your files.

brew search discord brew cask install discord brew cask upgrade

THis must first be set up by editing the config file: /etc/pam.d/sudo Then add this line to the top of the other auth lines:

auth sufficient pam_tid.so

speedtest-cli

After you install it with brew install youtube-dl or upgrade with brew upgrade youtube-dl you can run this:

• youtube-dl -f bestvideo+bestaudio ...