Find command in Linux

I suppose the “find” command is properly the most useful utility in UNIX/Linux.

The following are a few examples showing how to perform some common tasks using the “find” tool. I will add more as time goes on.

Basic syntax: find pathname... expression

#If you want to find files that are 7 days old, use the -mtime option
find . -mtime 7 -print
(Assuming today is 23-Dec, the command will show the files that are only dated 16-Dec.)

#An alternate way is to specify the range of periods
find . -mtime +6 -mtime -8 -print
find . -mtime +6 -mtime -8 -exec ls -lt {} \;

#Find files based on 7 days ago (atime means last accessed time)
find / -atime 7 -ls

#List old files and delete them (mtime means last modified/creation time of a file)
find -mtime +60 -exec rm -f {} \;

#Find core files in the directory and remove them
find . -name "core" -exec rm -f {} \;

Note:-

When using with “-exec” command, it should be used together with {} and ; (semicolon), where {} is used as a variable whose name is the file “find” found. As for ; (semicolon), it represents the end of command which must be punctuated by a quoted or escaped ; (semicolon).

*** df -h (human readable)

du -sh * | sort –nr

du -hsx * | sort -rh | head -10

Send Large Email Attachment Over Internet

In most of the organizations, they usually have a policy in place for E-mail system to restrict people from sending or receiving mail with very huge attachment.

You can’t use the personal E-mail account to do the task as well because they also have a control for maximum attachment size rule. As far as I know, Gmail can accept up to 20 MB whereas for Yahoo, it can only take up to 10 MB.

In that situation, perhaps you can consider using the online file storage services like Rapidshare, Megaupload to send the mail.

I have tested Rapidshare before using their free service. Even though the upload speed is not fast but at least it serves the purpose. For information, the file kept on their server will be automatically deleted if it has not been accessed for 90 days.

Cannot open attachment in Lotus Notes (How To)

I came across an incident that Lotus Notes user can't open (example Excel file) within Lotus Notes. The system prompted that "Sorry, an application to open this document cannot be found". The attachment has the .xls extension and can only be viewed with the Notes viewer, but cannot be opened.

Upon checking, I realized that it was simply due to Windows “file association” issue.

To resolve the issue, go to Windows Explorer > Tools > Folder Options > File Types. Then select XLS extension and associate it with the appropriate program (by clicking the “change” button).

That is how I solve the problem.

Making Your Own Passport Photo (How To)

Few days ago, my wife mentioned to me that she needs a photo in passport size for the kid so as to enroll her for school next year.

To save money, instead of going to photo shop to do it, I did it DIY for free via the web site below:-

http://www.epassportphoto.com

Frankly speaking, on the first thought, I was thinking to install a Photoshop software and then prepare the photo from there. Really didn’t expect it to be so easy!

Follow-up Flag

In Lotus Notes, the mails can be marked with a follow-up flag and assigned a date and time to remind you about the message.

The messages marked for follow-up have a flag icon next to it which allows you to sort them, making them easier to find and work with. You can also set up an alarm for a specific date, time as well as having an e-mail notification. Flagging a message also places it in the Follow Up view which show only messages requiring follow-up. To flag a mail, just select the message that you want to follow up and then click "Follow Up" button. And, follow by the "Add or Edit Flag". It is a good feature that helps user to manage mails!

Windows Vista - Parental Controls (How To)

If you are concerned about what your children are surfing on the internet or want to restrict them on the time spent in browsing, you may use the built-in Parental Controls to do the restriction… if your computer is running on Windows Vista.

Windows Vista comes with Parental Controls (not for Windows XP). Even though it is not very powerful, it still serves the purpose.

Assuming you already have a user account created for the child, follow the steps below to block their usage:-

1. Start > Control Panel > User Accounts and Family Safety.
2. Click “Set up parental controls for any user” and select the user account that you want to control the access.
3. Click “Time limits” and then click on the blue box next to “Blocked”.
4. Use the grid to set blocks of time when your child can use the computer.

With this setup, your child will not be able to log on during blocked times. If the child has already logged on when time limits expire, he/she will be automatically logged off by the system.

For details, you may refer to:-
http://www.microsoft.com/protect/products/family/vista.mspx

As a parent, if you willing to spend money, then you can consider getting “Advanced Parental Control” for a better control (can also monitor the usage of your PC).

	Advanced Parental Control (BuyNow)

Thermal Cooker (焖烧锅)

Another money saving’s tip…

焖烧锅(Thermal Cooker)是近年来流行的一种新型节能锅。它分为内外两层，内层是金属锅，外层是保温材料，将内锅放在火上，里面的汤水烧开后拎到外锅里，盖好，过几个小时就可取出来吃了，汤、粥、饭，都可以用它来煮。

它利用保温材料或真空断热原理阻隔空气，内锅沸腾的热气不会流失，反而在锅内循环，自四面八方为食物加热，免电免煤气免照顾，时候一到自然就是一道热熟的美味佳肴。

它最大的优点就是放进去后就不用管它了，因为不需要火,不需要电，不会有任何安全隐患，你大可以放心去上班、逛街、睡觉，到时候取出来吃就行。

焖烧锅适用于炖、熬、焖等料理，依照食谱指示控制烹调过程,才能恰到好处。焖烧内锅借助其它炉具将食物加热至沸腾2~15分钟再移置焖烧外锅中盖紧。

根据研究，焖烧锅可节省约60%-80%的煮食时间。

总之它的好处可以: 省时！省能源！简便！炖汤，炖肉，排骨汤，熬粥,蒸蛋，新鲜可口的美味任你享受！还有一个关键,就是在焖煮过程中营养保持绝佳！