BigW72

From https://unix.stackexchange.com/questions/402555/why-add-a-trailing-slash-after-an-rsync-destination

It does make a difference when the source is a file and the destination directory does not exist. For instance take a file called file as source:

$ rsync file dest/ will create a copy of file inside a directory dest, whereas

$ rsync file dest will make a copy of the file file called dest

To add (from the comments); if a directory dest already exists, a copy file will be created in dest in both cases above.

BigW72

# https://stackoverflow.com/questions/44780761/converting-csv-to-json-in-bash
cat my.csv | python -c 'import csv, json, sys; print(json.dumps([dict(r) for r in csv.DictReader(sys.stdin)]))'

BigW72

Attach to exising tmux session or create a new one

Create a new tmux session called 'main' if there is no existing session called 'main', otherwise attach to the existing 'main' session.

From an answer on https://unix.stackexchange.com/questions/103898/how-to-start-tmux-with-attach-if-a-session-exists

To ssh from iTerm2 on macOS

Add a -t switch to the ssh command for the profile. Works for me ssh'ing to an Ubuntu 18.04 host.

BigW72

sudo netstat -tulpn | grep ":53 "

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pip install --upgrade --upgrade-strategy only-if-needed somepackage

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/ssh:<remote-user>@<remote-host>|sudo:root@<remote-host>:/etc

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ioreg -l | awk '/product-name/ { split($0, line, "\""); printf("%s\n", line[4]); }'

BigW72

Verifying that +wessel is my blockchain ID. https://onename.com/wessel

BigW72

Keybase proof

I hereby claim:

• I am wdpreez1 on github.
• I am wdp (https://keybase.io/wdp) on keybase.
• I have a public key whose fingerprint is 49E1 75A3 6E4E 0E94 326F F0BA 5B0F 17D9 6DA2 CDE6

To claim this, I am signing this object:

BigW72

> `ssh root@dsl-router "tcpdump -s 0 -U -n -w - -i br0 not port 22" > /tmp/fifo/cap_fw`

`-s 0` means captures 0 bytes of data of each packet (i.e. just the header)

`-n` means don't look up the addresses

`-U` means write the descriptions immediately, not when closing the file

`-w -` means write to stdout