scp example

Copy the file "foobar.txt" from a remote host to the local host

$ scp your_username@remotehost.edu:~/work/foobar.txt ./some/local/directory

Copy the file "foobar.txt" from the local host to a remote host

$ scp foobar.txt your_username@remotehost.edu:~/some/remote/directory

Copy the directory "foo" from the local host to a remote host's directory "bar"

$ scp -r foo your_username@remotehost.edu:~/some/remote/directory/bar

Copy the file "foobar.txt" from remote host "rh1.edu" to remote host "rh2.edu"

$ scp your_username@rh1.edu:/some/remote/directory/foobar.txt \ your_username@rh2.edu:/some/remote/directory/

Copying the files "foo.txt" and "bar.txt" from the local host to your home directory on the remote host

$ scp foo.txt bar.txt your_username@remotehost.edu:~

Copy the file "foobar.txt" from the local host to a remote host using port 2264

$ scp -P 2264 foobar.txt your_username@remotehost.edu:/some/remote/directory

Copy multiple files from the remote host to your current directory on the local host

$ scp your_username@remotehost.edu:/some/remote/directory/\{a,b,c\} .

$ scp your_username@remotehost.edu:~/\{foo.txt,bar.txt\} .

wireshark tips

to find binary contents

frame contains 00:40:3f

(rather than 00403f, if you're searching for a byte with the value hex 00, followed by a byte with the value hex 40, followed by a byte with the value hex 3f) will match regardless of whether the frames are Ethernet frames or not.

to find string

frame contains "string"

802.11ac channel segment calculation

Seg0 = center frequency channel
Seg0 = (primary channel number) + (((bandwidth / 2) - 10) / 5)
* ( bandwidth / 2 ) = look up center
* ( -10 ) = 20MHz channel center is 10Mhz above
* ( /5 ) = 1 channel width is 5Mhz

Ch36 40MHz Seg0 = 36 + (((40 / 2) - 10) / 5) = 38 (36 + 2)
Ch36 80MHz Seg0 = 36 + (((80 / 2) - 10) / 5) = 42 (36 + 6)
Ch36 160MHz Seg0 = 36 + (((160 / 2) - 10) / 5) = 50 (36 + 14)

dot11CurrentChannelWidth
Channel width. Possible values represent 20 MHz, 40 MHz,
80 MHz, 160 MHz, and 80+80 MHz channels.

dot11CurrentChannelCenterFrequencyIndex0
For a 20 MHz, 40 MHz, 80 MHz, or 160 MHz channel, denotes
the channel center frequency.
For an 80+80 MHz channel, denotes the center frequency of the
frequency segment 0, which is the frequency segment containing
the primary channel.
Valid range is 1 to 200.
See Equation (22-102).

dot11CurrentChannelCenterFrequencyIndex1
For an 80+80 MHz channel, denotes the center frequency of the
frequency segment 1, which is the frequency segment that does
not contain the primary channel.
Valid range is 1 to 200.
See Equation (22-102).
For a 20 MHz, 40 MHz, 80 MHz, or 160 MHz channel, set to 0.

dot11CurrentPrimaryChannel
Denotes the location of the primary 20 MHz channel.
Valid range is 1 to 200.
See Equation (22-103).

22-103:
Primary 20 MHz channel center frequency [MHz]
= Channel starting frequency + 5 x dot11CurrentPrimaryChannel
ex) channel 36: 5000MHz + 5 x 36 = 5180Mhz
dot11CurrentPrimaryChannel = (5180 - 5000) / 5 = 36

22-102:
VHT80 Channel 36 center frequency = 5000 + 5 x 36 = 5180Mhz
* Ch36 80MHz Seg0 = 36 + (((80 / 2) - 10) / 5) = 42 (36 + 6)
Channel center frequency [MHz]
= Channel starting frequency + 5 x dot11CurrentChannelCenterFrequencyIndex
Channel center frequency [MHz] = 5000 + 5 x 42 = 5210MHz
dot11CurrentChannelCenterFrequencyIndex = dot11CurrentChannelCenterFrequencyIndex0 = 42

dot11CurrentChannelCenterFrequencyIndex is either dot11CurrentChannelCenterFrequencyIndex0 or
dot11CurrentChannelCenterFrequencyIndex1

802.11 - 2012 Element ID table

Table 8-54—Element IDs

IEEE document download sites

http://standards.ieee.org/about/get/

android memory analysis

adb shell dumpsys meminfo <package name | PID > [-d]

* Android Studio
View > Tool Windows > Android Monitor
> Select Monitors tab

* Capture a heap dump
At Memory monitor -> click Dump Java Heap
to convert : in Capture tab -> right click -> Export to standard .hprof

https://developer.android.com/studio/profile/investigate-ram.html#ViewHeap

How to list all gradle tasks

gradlew tasks