Add files to dropbox with single curl command

I have been thinking of posting this for sometime now. This is very useful, when you are working on a different Linux box and want to upload a file to dropbox.

 

So, before you run this command, you need to create your auth token in Dropbox developer API page. Once that is done, need to change the 2 parameters in command below. Export your Access token and run the below command.

Here is the command:

tar cvzf /tmp/backup.tgz <folder of your choice>
curl -X POST https://content.dropboxapi.com/2/files/upload \
    --header "Authorization: Bearer $OAUTH_ACCESS_TOKEN" \
    --header "Dropbox-API-Arg: {\"path\": \"/<dropbox path>/$(hostname -s)/$NOW.tgz\"}" \
    --header "Content-Type: application/octet-stream" \
    --data-binary @/tmp/backup.tgz

Split pcap to multiple files based on number of packets

Here is a script that can use tshark to split a large pcap to multiple small pcaps

 

inpcap="test.pcap"

max=$(tshark  -r $inpcap -n -T fields -e frame.number|tail -1)

# This is the number of packets in each split pcap
c=1

# Save all new pcaps to out, if it does not exist, create it.
[[ ! -d out ]] && mkdir out

for i in $(seq 1 $max $c)
do
        tshark  -r $inpcap  -n -c $c "frame.number==$i" -w out/$i.pcap
        #Do other stuff, if required
        read -p "Send the next packet? "
done

A very simple 3-4 line script that has saved my day so may times.

libvirt- Create virtual machine with text console only interface

virt-install is an amazing tool to create VMs. If you have created a config file (Kickstart file – ks.cfg), then its only one line un-attended install. If you are using this on remote host with ssh and unluckily cannot export display – what do you do. Do a non-graphical install. There are only minor changes in the command to tell the installer that there is no graphics available and it is amazing, is it not 🙂

virt-install --name test --os-variant=centos7 \
--description "CentOS 7.5 VM" --extra-args \
"ks=ks7.5.cfg console=ttyS0,115200n8 serial" --graphics none --console pty,target_type=serial \
--ram 60240  --vcpus 23 --disk path=/tmp/vm.qcow2,bus=virtio,size=20 \
--location /centos.iso --os-type=linux --hvm --accelerate \
--noautoconsole --wait=-1

 

Especifically for the no-graphical installation, I have added the following:

console=ttyS0,115200n8 serial — in extra-args

–graphics none

–console pty,target_type=serial

 

These options will enable installing the VM in a Text install mode and thus saving your day.