I am trying to create a bash script which shows me the latest stats about corona infection numbers in the countries Germany and Switzerland and also in the whole world.
corona () {
curl -s https://corona-stats.online\?minimal\=true | tee >(head -n 1) > >(grep "(CH)\|(DE)")
curl -s https://corona-stats.online\?minimal\=true | tail -n 20 | grep World
}
As you can see, to do this I had to create this very ugly script where curl is called twice. I had to do this because the website looks like this:
Rank World Total Cases New Cases ▲ Total Deaths New Deaths ▲ Recovered Active Critical Cases / 1M pop
1 USA (US) 7,497,256 2,585 ▲ 212,694 34 ▲ 4,737,369 2,547,193 14,190 22,617
2 India (IN) 6,397,896 5,936 ▲ 99,833 29 ▲ 5,352,078 945,985 8,944 4,625
3 Brazil (BR) 4,849,229 144,767 4,212,772 491,690 8,318 22,773
4 Russia (RU) 1,194,643 9,412 ▲ 21,077 186 ▲ 970,296 203,270 2,300 8,185
...
22 Germany (DE) 295,943 413 ▲ 9,586 259,500 26,857 362 3,529
...
58 Switzerland (CH) 54,384 552 ▲ 2,075 1 ▲ 45,300 7,009 32 6,272
...
World 34,534,040 63,822 ▲ 1,028,540 1,395 ▲ 25,482,492 8,023,008 66,092 4,430.85
Code: https://github.com/sagarkarira/coronavirus-tracker-cli
Twitter: https://twitter.com/ekrysis
Last Updated on: 02-Oct-2020 12:10 UTC
US STATES API: https://corona-stats.online/states/us
HELP: https://corona-stats.online/help
SPONSORED BY: ZEIT NOW
Checkout fun new side project I am working on: https://messagink.com/story/5eefb79b77193090dd29d3ce/global-response-to-coronavirus
I only want to display the first line, the last line of the table (World) and the two lines about Germany and Switzerland. I manged to display the first line as well as the two countries by piping the output of curl into head -n 1 and grepping the country codes. I was able to do both things thanks to this answer.
Now I want to get the last line in the table, the one where the current cases of the whole World are displayed. I tried to use tee again to pipe it into a third process tee >(head -n 1) > >(grep "(CH)\|(DE)") > >(tail -n 20 | grep World). But that didn't work. My first question is, how can I pipe an output into 3 different processes using tee?
The second question revolves around the way I try to grep the World line. I tail the last 20 lines and then grep "World". I do this because if I simply grep "World", it only return the title line where "World" can also be found. So my second question is: How can I grep only the last or second occurance?
You can chain several tee commands and throw away only the last output of tee:
curl -s ... | tee >( cmd1 ) | tee >( cmd2 ) | tee > >( cmd3 )
Actually, we can shorten it to:
curl -s ... | tee >( cmd1 ) | tee >( cmd2 ) | cmd3
because we do not use the output of the last tee anyway.
Having multiple commands write to the terminal at the same time might get the output mixed up. A much more elegant solution is to use only one grep, e.g.
curl -s ... | grep '(DE)\|(CH)\|World.*,'
The expression World.*, will just look for a comma in the same line after World, in order to exclude the head line.