Sharing Folder from Mac to Cent OS VM

Install VMware Tools

1. Start up VM.
2. Goto Virtual Machine -> Install VMware Tools
3. There will be a pop up window. Click Install to connect the VMware Tools installer CD to this virtual machine.
4. From the CD, Extract the VMwareTools-<version>.tar.gz
5. Goto the folder
6. Run the following command:

./vmware-install.pl -d --clobber-kernel-modules=vmhgfs

Share a Folder

1. Goto Virtual Machine -> Settings
2. In the pop up window choose Sharing
3. Check the Enable Shared Folders option
4. Click [+]  and select the folder on Mac which is to be shared
5. The folder will be visible under /mnt/hgfs/

Vim - Highlight OverLength

Add the following code to /etc/vimrc if we want to highlight the characters that go beyond column 80.

highlight OverLength ctermbg=red ctermfg=white guibg=#592929

match OverLength /\%81v.\+ 

Clearing OS cache

Run the following command as root

echo 3 > /proc/sys/vm/drop_caches

Find the list of directories with their Sizes

Get Size of all sub-directories

Command: 

du -sh <directory_path>/*

Example:
$ du -sh /home/Beena/*

4.0K /home/Beena/Desktop
4.0K /home/Beena/Documents
64M /home/Beena/Downloads
4.0K /home/Beena/Music
4.0K /home/Beena/Pictures
4.0K /home/Beena/Public
4.0K /home/Beena/Templates
4.0K /home/Beena/Videos

Get all files and sub-directories More than a specified size

Command: 

find <dir_path> -size +<size> -ls

Example:
$ find /home/Beena/ -size +10M -ls

Get all files and sub-directories Less than a specified size

Command: 

find <dir_path> -size -<size> -ls

Example:
$ find /home/Beena/ -size -10M -ls

Linux Users

List users

$ cat /etc/passwd | grep "/home"

Beena:x:500:500:Beena Emerson:/home/Beena:/bin/bash

Only list names:

$ cat /etc/passwd |grep /bin/bash |grep [5-9][0-9][0-9] |cut -d: -f1

Beena

Add New User

You have to be root user to be able to add new users.

# useradd test_user

# cat /etc/passwd |grep /bin/bash |grep [5-9][0-9][0-9] |cut -d: -f1

Beena

test_user

Switch Users:

# su test_user

[test_user@localhost ~]$

Add Password

# passwd test_user

Changing password for user test_user.

New password:

Retype new password:

passwd: all authentication tokens updated successfully.

Delete User

# userdel test_user

# cat /etc/passwd |grep /bin/bash |grep [5-9][0-9][0-9] |cut -d: -f1

Beena