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settings dir: ~/.aws/

# s3 bucket size
aws s3 ls --summarize --human-readable --recursive s3://bucket-name/

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xcrun simctl io booted recordVideo appvideo.mov

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defaults write $(mdls -name kMDItemCFBundleIdentifier -raw /Applications/MindNode.app) AppleLanguages '("en-US")'

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#write out current crontab
crontab -l > mycron
#echo new cron into cron file
echo "00 09 * * 1-5 echo hello" >> mycron
#install new cron file
crontab mycron
rm mycron

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# connect to tty on Docker for Mac VM
screen ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/tty

# disconnect that session but leave it open in background
Ctrl-a d

# list that session that's still running in background
screen -ls

# reconnect to that session (don't open a new one, that won't work and 2nd tty will give you garbled screen)

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#Delete docker container by name example
#!/bin/bash
CONTAINERID="$(docker ps | grep $1 | cut -d" " -f1)"
docker rm -f $CONTAINERID 1> /dev/null 2> /dev/null
if [ $? -eq 0 ]
then
  echo "Successfully delete container $CONTAINERID"
  exit 0
else
  echo "Container not found" >&2

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Archive and zip: tar -zcvf test.tar.gz test.txt
Unzip: tar -zxvf test.tar.gz

List ordered by size: ls -lS
Return first field from text file (space delimeted): cut -d" " -f1 somefile.txt (-d delimeter, -f field number)

SSH not send locale:
Remove SendEnv LANG LC_* line in /etc/ssh/ssh_config

SSH not accept locale: 

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Run container with specified pgdata path:
docker run --name pgs-test -p 5432:5432 -v /Users/{user}/pgdata:/var/lib/postgresql/data -e POSTGRES_USER=usr -e POSTGRES_PASSWORD=pass1 -e POSTGRES_DB=db -d pgs-test

Backup:
docker exec pgs-test bash -c 'pg_dump -U usr --format=t --file=/pgback/back1.tar todo'

Restore:
docker exec pgs-test bash -c 'pg_restore -Uusr --create --clean --dbname=todo /pgback/back1.tar'

#dump db

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Observable.deferred {
 return NotificationCenter.default
 .rx
 .notification(notifName)
 .map { _ ... }
 .startWith(IdentityProviderManager.hasFacebookIdentity)
 }.distinctUntilChanged()```

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extension ObservableType {
    func polling(interval: RxTimeInterval, scheduler: SchedulerType = MainScheduler.instance) -> Observable<E> {
        return Observable<Int>.interval(interval, scheduler: scheduler)
            .flatMapFirst { _ in
                return self.asObservable()
            }
    }
}