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Secure an Excel workbook with a password

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To allow only authorized users to view or modify your data, you can help secure your entire workbook file with a password. 1. On the File menu, click Save As 2. On the Tools menu, click General Options. 3. Do either or both of the following:
    • If you want users to enter a password before they can view the workbook, type a password in the Password to open box, and then click OK.
    • If you want users to enter a password before they can save changes to the workbook, type a password in the Password to modify box.
 Note   Unlike passwords you specify in the Password to open box, passwords you specify in the Password to modify box are not encrypted. These passwords are only meant to give specific users permission to modify workbook data. For optimal password security,...

Find and Change File Permissions Recursively, Linux / UNIX

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To find all files in /home/user/demo directory, enter: $ find /home/user/demo -type f -print To find all files in /home/user/demo directory with permission 777, enter: $ find /home/user/demo -type f -perm 777 -print Finally, apply new permission using the -exec option as follows: $ find /home/user/demo -type f -perm 777 -print -exec chmod 755 {} \; To select directories and subdirectories use the following syntax: $ find /home/user/demo -type d -perm 777 -print -exec chmod 755 {} \;...

Unknown table engine ‘InnoDB’

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If You are facing problem with Unknown table engine 'InnoDB' on to your mysql Database. You can do following to get rid of this problem. First look at the ib_logfile0 and ib_logfile1 in /var/lib/mysql. If they have been set to size different from the default, that probably will prevent mysqld's startup. The default for innodb_lkog_file_size is 5M. Add this in my.cnf 
[mysqld]
innodb_log_file_size = 12M
And then Proceed by doing following 
/etc/init.d/mysql stop

mv /var/lib/mysql/ib_logfile0 /var/lib/mysql/ib_logfile0.bak # these are your
mv /var/lib/mysql/ib_logfile1 /var/lib/mysql/ib_logfile1.bak # log files

/etc/init.d/mysql start
 ...

extract .xz format Linux

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If the file is just something.xz (without .tar) then use 
unxz something.xz
Otherwise use 
*.tar.bz2)	tar xvjf filename.tar.bz2) ;;
*.tar.gz)	tar xvzf filename.tar.gz) ;;
*.tar.xz)	tar Jxvf filename.tar.xz) ;;
*.bz2)		bunzip2 filename.bz2) ;;
*.rar)		unrar filename.rar) ;;
*.gz)		gunzip filename.gz) ;;
*.tar)		tar xvf filename.tar) ;;
*.tbz2)		tar xvjf filename.tbz2) ;;
*.tgz)		tar xvzf filename.tgz) ;;
*.zip)		unzip filename.zip) ;;
*.Z)		uncompress filename.Z) ;;
*.7z)		7z filename.7z) ;;
 ...

Change MySQL root Password

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Change MySQL root Password

Method #1: Use mysqladmin command to change root password

If you have never set a root password for MySQL server, the server does not require a password at all for connecting as root. To setup root password for first time, use mysqladmin command at shell prompt as follows: $ mysqladmin -u root password NEWPASSWORD However, if you want to change (or update) a root password, then you need to use the following command: $ mysqladmin -u root -p'oldpassword' password newpass For example, If the old password is abc, you can set the new password to 123456, enter: 
$ mysqladmin -u root -p'abc' password '123456'

Method #2: Changing MySQL root user password using mysql command

This is an another method. MySQL stores username and passwords in user table inside MySQL database. You can directly update or change the password using the...
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