Linux / Unix: Find and Delete All Empty Directories & Files

How do I find out all empty files and directories on a Linux / Apple OS X / BSD / Unix-like operating systems and delete them in a single pass?

Find and delete all empty directories:

$ find /path/to/dir -empty -type d -delete

Find and delete all empty files:

find /path/to/dir -empty -type f -delete

Reference:
http://www.cyberciti.biz/faq/howto-find-delete-empty-directories-files-in-unix-linux/

 

Vault by HashCorp

Vault secures, stores, and tightly controls access to tokens, passwords, certificates, API keys, and other secrets in modern computing. Vault handles leasing, key revocation, key rolling, and auditing. Vault presents a unified API to access multiple backends: HSMs, AWS IAM, SQL databases, raw key/value, and more.

https://vaultproject.io/

 

Collecting Ubuntu Linux System Information

For new computer or Laptop or server, I need to collect the information about its hardware. This is also useful when you need to replace a disk or memory with a vendor. In order to replace hardware you need all information in advance.

Display the system’s host name:

$ hostname

Display the system’s DNS domain name:

$ dnshostname

 

Find the system serial number, manufacturer of the system and model name:

$ sudo dmidecode -s system-serial-number
$ sudo dmidecode -s system-manufacturer
$ sudo dmidecode -s system-product-name
$ sudo dmidecode | more

OR use the lshw command:

# lshw | more
$ sudo lshw -short

Display information about installed hardware

$ sudo lsdev

Find the system CPU info

$ cat /proc/cpuinfo

Find the system main memory (RAM) info. Show statistics about memory usage on the system including total installed and used RAM:

$ less /proc/meminfo

Find the Ubuntu Linux distribution version and related information:

$ lsb_release -a

Find the system kernel architecture (32 bit or 64 bit):

$ uname -m
$ getconf LONG_BIT
$ arch

Show all installed disks and size:

# fdisk -l | grep '^Disk /dev'

Display SCSI devices (or hosts) and their attributes on Linux:

$ lsscsi

Find the system PCI devices information:

$ lspci
$ lspci -vt
$ lspci | grep -i 'something'
$ lspci -vvvn| less

Find the system USB devices information:

$ lsusb
$ lsusb -vt

Find the system Wireless devices information:

$ iwconfig
$ watch -n 1 cat /proc/net/wireless
$ wavemon

Find the system audio devices information:

$ lspci | grep -i audio

Display the system drivers (modules):

$ sudo lsmod
$ sudo modinfo {driver_name}
$ sudo modinfo kvm

Display the list of running services:
### SYS V ###

$ sudo service --status-all

OR
## UPSTART ##

$ sudo initctl list

Find out if service is enabled:
## UPSTART ##

$ sudo initctl status service-name
$ sudo initctl status smbd

OR
## SYS V

$ sudo service serviceName status
$ sudo service nginx status