ddre54

One time I accidentally messed with the /etc/passwd and locked myself out of being able to SSH into the machine. Since this is a remote machine in AWS I had no way of doing what I'd normally do. Which is attaching a keyboard and monitor and fixing this manually.

To fix, use the AWS EC2 Management page to:

• spin up a new instance of vanilla ubuntu EC2 (let's call it David)
• shutdown the locked machine (let's call it Goliath)
• unmount Goliath's volume
• attach the volume to David

Then follow this guide: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-using-volumes.html

ddre54

# Download all the logs from Papertrail and Process specific logs based on grep expression
# - 1 Download the logs


curl -sH 'X-Papertrail-Token: YOUR-HTTP-API-KEY' https://papertrailapp.com/api/v1/archives.json |
  grep -o '"filename":"[^"]*"' | egrep -o '[0-9-]{3,}' |
  awk '{
    print "url = https://papertrailapp.com/api/v1/archives/" $0 "/download"
    print "output = " $0 ".tsv.gz"
  }' | curl --globoff --progress-bar -fLH 'X-Papertrail-Token: YOUR-HTTP-API-KEY' -K-

ddre54

#!/bin/bash
grep -E -o "\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,6}\b" log_file.txt 

ddre54

tmux-cssh -i ~/.ssh/<KEY> -u user <HOST1> <HOST2> <HOST3> <HOST4>

ddre54

# /bin/bash
sudo killall VDCAssistant

ddre54

// Prints all the sparse indexes in the db
db.getCollectionNames().forEach(function(collection) {
  indexes = db[collection].getIndexes();
  print("Indexes for " + collection + ":");
  indexes.forEach(function(index) {
    if (index['sparse']) {
      printjson(index);
    }
  });
});

ddre54

# Useful for testing things that are time zone
# sensitive - like scheduling things

# Get current timezone
sudo systemsetup -gettimezone

# Get list of available timezones
sudo systemsetup -listtimezones

# Set the timezone to the selected timezone

ddre54

# /bin/bash

sudo find / -type f -size +10M -exec ls -lh {} \;

# Truncate files that need sudo
sudo truncate -s0 file.txt

ddre54

--Starting with redis 2.6.0, you can run lua scripts
EVAL "return redis.call('del', unpack(redis.call('keys', ARGV[1])))" 0 prefix:*

--For big number of keys
EVAL "local keys = redis.call('keys', ARGV[1]) \n for i=1,#keys,5000 do \n redis.call('del', unpack(keys, i, math.min(i+4999, #keys))) \n end \n return keys" 0 prefix:*

ddre54

#!/bin/sh

top -pid $(ps -A | grep -m1 'unicorn worker' | awk '{print $1}')