ggrandes

#!/bin/bash
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

ggrandes

# Generate RSA Key-Pair
openssl genrsa -out test.key 2048
openssl rsa -pubout -in test.key -out test.pub
# Signature
openssl dgst -sha512 -sign test.key some-file.txt | openssl enc -a -e > some-file.txt.sign
# Verify
openssl enc -a -d < some-file.txt.sign | openssl dgst -sha512 -verify test.pub -signature /dev/stdin some-file.txt

ggrandes

awk -- '$4 ~ /^[0-9]+$/ {print $4}' <(df -kP /tmp)

ggrandes

# Works on any machine with 1 ethernet (eth0)
cat /sys/class/net/eth0/address

# Works on { VMWARE, Baremetal, KVM (if setted with -uuid %s) }, Fail on { AWS/XEN }
cat /sys/devices/virtual/dmi/id/product_uuid
dmidecode -s system-uuid

# Works on { VMWARE, Baremetal }, Fail on { AWS/XEN, KVM }
cat /sys/devices/virtual/dmi/id/product_serial

ggrandes

#!/bin/bash
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

ggrandes

Name	Speed (bit/s)	Speed (byte/s)
USB 2.0	480Mbit	60MBytes/s
USB 3.0	5Gbit	625MBytes/s
USB 3.1	10Gbit	1250MBytes/s
SATA 1.0/SATA-150	1.5Gbit	[a] 150MBytes/s
SATA 2.0/SATA-300	3Gbit	[a] 300MBytes/s
SATA 3.0/SATA-600	6Gbit	[a] 600MBytes/s
SATA 3.2/SATA-Express	16Gbit	2000MBytes/s
Serial Attached SCSI (SAS)	3Gbit/s	[a] 300MBytes/s

ggrandes

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLParameters;
import java.security.Provider;
import java.security.Security;

public class SSLSupport {
        public static void main(String[] args) throws Throwable {
                try {
                        final String bcName = "org.bouncycastle.jce.provider.BouncyCastleProvider";
                        Security.addProvider((Provider) Class.forName(bcName).newInstance());

ggrandes

#!/bin/bash
# In New Ubuntu Versions:
# apt-get -y autoremove
uname -a
ls -al /boot/vmlinuz-*
sudo aptitude -y purge $(ls -1 /boot/vmlinuz-* | grep -v ".efi." | grep -v -e $(uname -r) | sort | head -n -1 | sed -e 's|/boot/vmlinuz|linux-image|g')

ggrandes

#!/bin/bash
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

ggrandes

#!/bin/bash
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.