Q. How do I find out all large files in a directory?

A. There is no single command that can be used to list all large files. But, with the help of find command and shell pipes, you can easily list all large files.

Linux List All Large Files

To finds all files over 50,000KB (50MB+) in size and display their names, along with size, use following syntax:

Syntax for RedHat / CentOS / Fedora Linux

find {/path/to/directory/} -type f -size +{size-in-kb}k -exec ls -lh {} \; | awk '{ print $9 ": " $5 }'
Search or find big files Linux (50MB) in current directory, enter:
$ find . -type f -size +50000k -exec ls -lh {} \; | awk '{ print $9 ": " $5 }'
Search in my /var/log directory:
# find /var/log -type f -size +100000k -exec ls -lh {} \; | awk '{ print $9 ": " $5 }'

Syntax for Debian / Ubuntu Linux

find {/path/to/directory} -type f -size +{file-size-in-kb}k -exec ls -lh {} \; | awk '{ print $8 ": " $5 }'
Search in current directory:
$ find . -type f -size +10000k -exec ls -lh {} \; | awk '{ print $8 ": " $5 }'
Sample output:

./.kde/share/apps/akregator/Archive/http___blogs.msdn.com_MainFeed.aspx?Type=AllBlogs.mk4: 91M
./out/out.tar.gz: 828M
./.cache/tracker/file-meta.db: 101M
./ubuntu-8.04-desktop-i386.iso: 700M
./vivek/out/mp3/Eric: 230M

Above commands will lists files that are are greater than 10,000 kilobytes in size. To list all files in your home directory tree less than 500 bytes in size, type:
$ find $HOME -size -500b
OR
$ find ~ -size -500b

To list all files on the system whose size is exactly 20 512-byte blocks, type:
# find / -size 20

Perl hack: To display large files

Jonathan has contributed following perl code print out stars and the length of the stars show the usage of each folder / file from smallest to largest on the box:

 du -k | sort -n | perl -ne 'if ( /^(\d+)\s+(.*$)/){$l=log($1+.1);$m=int($l/log(1024)); printf  ("%6.1f\t%s\t%25s  %s\n",($1/(2**(10*$m))),(("K","M","G","T","P")[$m]),"*"x (1.5*$l),$2);}'

ls command: finding the largest files in a directory

You can also use ls command:
$ ls -lS
$ ls -lS | less
$ ls -lS | head +10

ls command: finding the smallest files in a directory

Use ls command as follows:
$ ls -lSr
$ ls -lSr | less
$ ls -lSr | tail -10

When malicious intruders compromise a web server, there’s an excellent chance a famous Russian PHP script, r57shell, will follow. The r57shell PHP script gives the intruder a number of capabilities, including, but not limited to: downloading files, uploading files, creating backdoors, setting up a spam relay, forging email, bouncing a connection to decrease the risk of being caught, and even taking control of SQL databases. All these functions become readily available through an easy to use web interface, but now you can fight back.

A Turkish member on a forum I participate in released this nifty little bash command, but first, make sure you execute updatedb so find has an up to date image to search:

find /var/www/  -name "*".php  -type f -print0  | xargs -0 grep r57 | uniq -c  | sort -u  | cut -d":" -f1  | awk '{print "rm -rf " $2}' | uniq

You can also search regular text (.txt) files:

find /var/www/  -name "*".txt  -type f -print0  | xargs -0 grep r57 | uniq -c  | sort -u  | cut -d":" -f1  | awk '{print "rm -rf " $2}' | uniq

Or even cleverly disguised GIF image files:

find /var/www/  -name "*".gif  -type f -print0  | xargs -0 grep r57 | uniq -c  | sort -u  | cut -d":" -f1  | awk '{print "rm -rf " $2}' | uniq

The command might appear scary, or even malicious to an inexperienced Linux admin, but here’s the break down.

find /var/www/

find is a must know command when dealing with Linux. Find is what’s used to perform command line file searches. The path /var/www is the directory find will search, in addition to all directories contained within www, but nothing above. For example, /var/mail is not searched. If your publicly accessible files are not contained in /var/www, then you’ll obviously need to replace /var/www with the correct path.

-name "*".php  -type f -print0

This portion of the command tells find to search file names (not directories) ending in .php. Anything else is ignored.

| xargs -0 grep r57

The pipe symbol ( | ) tells Linux to take the results of the first command (the PHP files we searched for), and pass them along to the second command, xargs. At this point, all located files are searched for any mention of r57, not just the file names, but the actual content within the files.

| uniq -c  | sort -u

uniq will prevent duplicate results from displaying. The command is smart enough to know when multiple instances are found in a single file, resulting in a single mention instead of potentially hundreds, flooding your console with repeated messages. The -c parameter tells uniq to count the number of consecutive lines that were combined. sort will take the unordered results, and display them in some type of orderly fashion.

| cut -d":" -f1

cut will prevent the line of code that contains r57 from showing up in the results. The output is just a simple mention of the filename or names, and how many occurrences. There’s no need to display the actual code if your intentions are to remove the malicious files.

| awk '{print "rm -rf " $2}'

awk, a programming language in itself, is a very powerful command with many beneficial uses. In this command, awk is instructed to print rm -rf with the file path and file name appended. Here’s an example output:

rm -rf /var/www/users/domain.com/images/uploads/r57shell.php

rm -rf is used to delete files without asking questions. The, “are you sure you want to delete …” is skipped, so be careful when using the -rf switch, it’s very destructive if used without care. Notice the print portion - this means the command is only printed, not carried out. Once you’ve confirmed all the found files are malicious, you can easily dumb the results into a file, make the file executable, and delete the plague in one shot instead of manually deleting individual files one by one.

Another popular tool is the c99shell, which I also recommend searching for. Just change three characters:

find /var/www/  -name "*".php  -type f -print0  | xargs -0 grep c99 | uniq -c  | sort -u  | cut -d":" -f1  | awk '{print "rm -rf " $2}' | uniq

If you’re interested in seeing an example of the c99shell interface, here’s a rooted site:

http://www.iett.gov.tr/en/kitap/

Well, i want to schedules to run one of my file every 5 minutes. Then what would be the best choose. Yes, CRON.
I can schedule my cron to run that file every five minutes to execute my desired results. Thats why i want to make a note on this regards.

To edit the crontab i use the following command:

$ crontab -e

To list my currnet crontab

$ crontab -l

The following is the format entries in a crontab must be. Note all lines starting with # are ignored, comments.

So in terminal print ‘Hello’ every 5 minutes..

# MIN   HOUR   MDAY  MON  DOW   COMMAND 
   */5     *      *     *    *    echo 'Hello' 

MIN	Minute 	 0-60
HOUR	Hour [24-hour clock] 	0-23
MDAY	Day of Month 	1-31
MON	Month 	1-12 OR jan,feb,mar,apr ...
DOW	Day of Week 	0-6 OR
sun,mon,tue,wed,thu,fri,sat
COMMAND	Command to be run 	Any valid command-line

Examples

Here are a few examples, to see what some entries look like.

#Run command at 7:00am each weekday [mon-fri]
00 07 * * 1-5 mail_pager.script ‘Wake Up’

#Run command on 1st of each month, at 5:30pm
30 17 1 * * pay_rent.script

#Run command at 8:00am,10:00am and 2:00pm every day
00 8,10,14 * * * do_something.script

#Run command every 5 minutes during market hours
*/5 6-13 * * mon-fri get_stock_quote.script

#Run command every 3-hours while awake
0 7-23/3 * * * drink_water.script

Special Characters in Crontab

You can use an

asterisk

in any category to mean for every item, such as every day or every month.

You can use commas in any category to specify multiple values. For example: mon,wed,fri

You can use dashes to specify ranges. For example: mon-fri, or 9-17

You can use forward slash to specify a repeating range. For example: */5 for every five minutes, hours, days
Special Entries

There are several special entries, some which are just shortcuts, that you can use instead of specifying the full cron entry.

The most useful of these is probably @reboot which allows you to run a command each time the computer gets reboot. This could be useful if you want to start up a server or daemon under a particular user, or if you do not have access to the rc.d/init.d files.

Example Usage:

# restart freevo servers
@reboot freevo webserver start
@reboot freevo recordserver start

The complete list:

Miscelleanous Issues

Script Output
If there is any output from your script or command it will be sent to that user’s e-mail account, on that box. Using the default mailer which must be setup properly.

You can set the variable MAILTO in the crontab to specify a separate e-mail address to use. For example:
MAILTO=”admin@mydomain.com”

Redirect Output to /dev/null
You can redirect the output from a cron script to /dev/null which just throws it away. By redirecting to /dev/null you will not receive anything from the script, even if it is throwing errors.
* * * * * /script/every_minute.pl > /dev/null 2>&1

Missed Schedule Time
Cron does not run a command if it was missed. Your computer must be running for cron to run the job at the time it is scheduled. For example, if you have a 1:00am scheduled job and your computer was off at that time, it will not run the missed job in the morning when you turn it on.

Linux Crontab Guide
An experienced Linux sysadmin knows the importance of running the routine maintenance jobs in the background automatically.

Linux Cron utility is an effective way to schedule a routine background job at a specific time and/or day on an on-going basis.

This article is part of the on-going series. In this article, let us review 15 awesome examples of crontab job scheduling.

Linux Crontab Format

MIN HOUR DOM MON DOW CMD

1. Scheduling a Job For a Specific Time Every Day

The basic usage of cron is to execute a job in a specific time as shown below. This will execute the Full backup shell script (full-backup) on 10th June 08:30 AM.

Please note that the time field uses 24 hours format. So, for 8 AM use 8, and for 8 PM use 20.

30 08 10 06 * /home/ramesh/full-backup

• 30 – 30th Minute
• 08 – 08 AM
• 10 – 10th Day
• 06 – 6th Month (June)
• * – Every day of the week

2. Schedule a Job For More Than One Instance (e.g. Twice a Day)

The following script take a incremental backup twice a day every day.

This example executes the specified incremental backup shell script (incremental-backup) at 11:00 and 16:00 on every day. The comma separated value in a field specifies that the command needs to be executed in all the mentioned time.

00 11,16 * * * /home/ramesh/bin/incremental-backup

• 00 – 0th Minute (Top of the hour)
• 11,16 – 11 AM and 4 PM
• * – Every day
• * – Every month
• * – Every day of the week

3. Schedule a Job for Specific Range of Time (e.g. Only on Weekdays)

If you wanted a job to be scheduled for every hour with in a specific range of time then use the following.

Cron Job everyday during working hours

This example checks the status of the database everyday (including weekends) during the working hours 9 a.m – 6 p.m

00 09-18 * * * /home/ramesh/bin/check-db-status

• 00 – 0th Minute (Top of the hour)
• 09-18 – 9 am, 10 am,11 am, 12 am, 1 pm, 2 pm, 3 pm, 4 pm, 5 pm, 6 pm
• * – Every day
• * – Every month
• * – Every day of the week

Cron Job every weekday during working hours

This example checks the status of the database every weekday (i.e excluding Sat and Sun) during the working hours 9 a.m – 6 p.m.

00 09-18 * * 1-5 /home/ramesh/bin/check-db-status

• 00 – 0th Minute (Top of the hour)
• 09-18 – 9 am, 10 am,11 am, 12 am, 1 pm, 2 pm, 3 pm, 4 pm, 5 pm, 6 pm
• * – Every day
• * – Every month
• 1-5 -Mon, Tue, Wed, Thu and Fri (Every Weekday)

4. How to View Crontab Entries?

View Current Logged-In User’s Crontab entries

To view your crontab entries type crontab -l from your unix account as shown below.

ramesh@dev-db$ crontab -l
@yearly /home/ramesh/annual-maintenance
*/10 * * * * /home/ramesh/check-disk-space

[Note: This displays crontab of the current logged in user]

View Root Crontab entries

Login as root user (su – root) and do crontab -l as shown below.

root@dev-db# crontab -l
no crontab for root

Crontab HowTo: View Other Linux User’s Crontabs entries

To view crontab entries of other Linux users, login to root and use -u {username} -l as shown below.

root@dev-db# crontab -u sathiya -l
@monthly /home/sathiya/monthly-backup
00 09-18 * * * /home/sathiya/check-db-status

5. How to Edit Crontab Entries?

Edit Current Logged-In User’s Crontab entries

To edit a crontab entries, use crontab -e as shown below. By default this will edit the current logged-in users crontab.

ramesh@dev-db$ crontab -e
@yearly /home/ramesh/centos/bin/annual-maintenance
*/10 * * * * /home/ramesh/debian/bin/check-disk-space
~
"/tmp/crontab.XXXXyjWkHw" 2L, 83C

[Note: This will open the crontab file in Vim editor for editing.
Please note cron created a temporary /tmp/crontab.XX... ]

When you save the above temporary file with :wq, it will save the crontab and display the following message indicating the crontab is successfully modified.

~
"crontab.XXXXyjWkHw" 2L, 83C written
crontab: installing new crontab

Edit Root Crontab entries

Login as root user (su – root) and do crontab -e as shown below.

root@dev-db# crontab -e

Edit Other Linux User’s Crontab File entries

To edit crontab entries of other Linux users, login to root and use -u {username} -e as shown below.

root@dev-db# crontab -u sathiya -e
@monthly /home/sathiya/fedora/bin/monthly-backup
00 09-18 * * * /home/sathiya/ubuntu/bin/check-db-status
~
~
~
"/tmp/crontab.XXXXyjWkHw" 2L, 83C

6. Schedule a Job for Every Minute Using Cron.

Ideally you may not have a requirement to schedule a job every minute. But understanding this example will will help you understand the other examples mentioned below in this article.

* * * * * CMD

The * means all the possible unit — i.e every minute of every hour through out the year. More than using this * directly, you will find it very useful in the following cases.

• When you specify */5 in minute field means every 5 minutes.
• When you specify 0-10/2 in minute field mean every 2 minutes in the first 10 minute.
• Thus the above convention can be used for all the other 4 fields.

7. Schedule a Background Cron Job For Every 10 Minutes.

Use the following, if you want to check the disk space every 10 minutes.

*/10 * * * * /home/ramesh/check-disk-space

It executes the specified command check-disk-space every 10 minutes through out the year. But you may have a requirement of executing the command only during office hours or vice versa. The above examples shows how to do those things.

Instead of specifying values in the 5 fields, we can specify it using a single keyword as mentioned below.

There are special cases in which instead of the above 5 fields you can use @ followed by a keyword — such as reboot, midnight, yearly, hourly.

8. Schedule a Job For First Minute of Every Year using @yearly

If you want a job to be executed on the first minute of every year, then you can use the @yearly cron keyword as shown below.

This will execute the system annual maintenance using annual-maintenance shell script at 00:00 on Jan 1st for every year.

@yearly /home/ramesh/red-hat/bin/annual-maintenance

9. Schedule a Cron Job Beginning of Every Month using @monthly

It is as similar as the @yearly as above. But executes the command monthly once using @monthly cron keyword.

This will execute the shell script tape-backup at 00:00 on 1st of every month.

@monthly /home/ramesh/suse/bin/tape-backup

10. Schedule a Background Job Every Day using @daily

Using the @daily cron keyword, this will do a daily log file cleanup using cleanup-logs shell scriptat 00:00 on every day.

@daily /home/ramesh/arch-linux/bin/cleanup-logs "day started"

11. How to Execute a Linux Command After Every Reboot using @reboot?

Using the @reboot cron keyword, this will execute the specified command once after the machine got booted every time.

@reboot CMD

12. How to Disable/Redirect the Crontab Mail Output using MAIL keyword?

By default crontab sends the job output to the user who scheduled the job. If you want to redirect the output to a specific user, add or update the MAIL variable in the crontab as shown below.

ramesh@dev-db$ crontab -l
MAIL="ramesh"

@yearly /home/ramesh/annual-maintenance
*/10 * * * * /home/ramesh/check-disk-space

[Note: Crontab of the current logged in user with MAIL variable]

If you wanted the mail not to be sent to anywhere, i.e to stop the crontab output to be emailed, add or update the MAIL variable in the crontab as shown below.

MAIL=""

13. How to Execute a Linux Cron Jobs Every Second Using Crontab.

You cannot schedule a every-second cronjob. Because in cron the minimum unit you can specify is minute. In a typical scenario, there is no reason for most of us to run any job every second in the system.

14. Specify PATH Variable in the Crontab

All the above examples we specified absolute path of the Linux command or the shell-script that needs to be executed.

For example, instead of specifying /home/ramesh/tape-backup, if you want to just specify tape-backup, then add the path /home/ramesh to the PATH variable in the crontab as shown below.

ramesh@dev-db$ crontab -l

PATH=/bin:/sbin:/usr/bin:/usr/sbin:/home/ramesh

@yearly annual-maintenance
*/10 * * * * check-disk-space

[Note: Crontab of the current logged in user with PATH variable]

15. Installing Crontab From a Cron File

Instead of directly editing the crontab file, you can also add all the entries to a cron-file first. Once you have all thoese entries in the file, you can upload or install them to the cron as shown below.

ramesh@dev-db$ crontab -l
no crontab for ramesh

$ cat cron-file.txt
@yearly /home/ramesh/annual-maintenance
*/10 * * * * /home/ramesh/check-disk-space

ramesh@dev-db$ crontab cron-file.txt

ramesh@dev-db$ crontab -l
@yearly /home/ramesh/annual-maintenance
*/10 * * * * /home/ramesh/check-disk-space

Note: This will install the cron-file.txt to your crontab, which will also remove your old cron entries. So, please be careful while uploading cron entries from a cron-file.txt.

Linux - Find string in files.

The -s is for summary and won't display warning messages such as grep: ./directory-name: Is a directory

The -l is for list, so we get just the filename and not all instances of the match displayed in the results.

Performing the search on the current directory I get:

./javascript_open_new_window_form.php
./excel_large_number_error.php
./linux_vi_string_substitution.php
./email_reformat.php
./online_email_reformat.php
./excel_find_question_mark.php
./linux_find_string_in_files.php
./excel_keyboard_shortcuts.php
./linux_grep.php
./md5_unique_sub_string.php
./email_reformat_token.php
./excel_password_protect.php
./mysql_date_calulation.php
./md5_string.php
./php_javascript_passing_values_to_new_window_in_url.php
./php_math_on_string/math_on_string_form.php
./guide.php
./excel_large_number_paste.php
./piping_commands_find_grep_sed.php
./google-search-for-seo-research.php
./filename_conversion_form.php
./linux_find_string_files.php

I find this useful for just quickly seeing which files contain a search time. I would normally limit the files searched with a command such as :

Another common search for me, is to just look at the recently updated files:

would find only files edited today, whilst the following finds the files older than today:

Currently, if you run Debian on a Slicehost server, the log file for cron tasks is disabled by default. I am not sure about other distributions on other hosts, or even other distributions on Slicehost. Regardless, here is how you re-enable cron logging on your slice.

1. Navigate to /etc  (cmd: cd /etc)
2. Back-up syslog.conf  (cmd: cp syslog.conf syslog.conf.bak)
3. Edit syslog.conf  (cmd: pico syslog.conf)
4. Remove the comment that disables this line: cron.* /var/log/cron.log
5. Save the file and exit
6. Restart the syslog daemon  (cmd: /etc/init.d/sysklogd restart)
7. Check to make sure that the file /var/log/cron.log exists. This is where your log entries will be.

Enjoy!

One day, Philipp Keller got fed up with installing sound libraries to listen to old-skool music files, so he decided to write a script that takes the hassle out of it and convert any mod to an mp3 file. Now you can download his script for free and use it on your own Linux box to convert your precious mod collection to mp3 for on-the-go listening.

Last.fm Integration

Playing your music modules as mp3 files has the added effect of allowing you to scrobble your music to Last.fm. Typically, playing anything but an mp3 causes Last.fm to disregard your tune. I know that if Last.fm or the WinAmp Audioscrobbler plugin took my mod playing seriously, I’d have a way different collection. Now I can.

Open source rules. Long live music modules!

Well, it’s been just over a month since I made the switch to Linux from Windows. My distribution of choice for desktop PCs has always been the fantastic Mandriva Linux. Available for free with plenty of included software (Open Office suite, the Firefox web browser, Kopete messenger, Amarok media player, and much more), it’s always done the trick and looks wonderful doing so.

I have two physical hard drives in my PC. The first one is mounted ‘/’ for all my system files and programs. The second drive is my ‘/home’ directory, where all of my documents are kept. All of the system files are kept entirely separate from your documents.This sort of division is done even with one single hard drive automatically by Mandriva so that if you ever need to format or upgrade the operating system you don’t lose any of your pictures, movies, or music, ever.

Me playing Morrowind in Linux

Life without Windows is certainly possible. I’m living proof. And the stuff I use my computer for is likely more intense than your average Joe since I’m a web developer. All of the required software that I use on a daily basis is available and runs great in Linux.

All of my games worked out-of-the-box using the Windows games and software emulator* (Read more about the Wine project). I’ve included a screenshot of me playing Morrowind. It runs great. My girlfriend and I played through Max Payne on this PC, as well, and we’re a quarter of the way through the Quest for Glory 2 remake (which is a lot of fun, by the way) on my other Mandriva Linux PC (our media center).

If you’re considering running Linux or if you’ve heard about it and are curious, give Mandriva Linux One a try. It’s pretty simple: You download it and burn it onto a blank CDR. Reboot with the disc in the drive and you can use it right off the disc without actually installing it. If you like it, go ahead and install it. Otherwise, just take the disc out and reboot — nothing has been changed on your computer.

For more information about Linux, try reading some of these sites:

• Wikipedia article on Desktop Linux
• Linux Guides – Help for Newbies
• Read about Mandriva Linux

* I realize Wine is technically not an emulator, but when explaining what it does it helps to use that term.

Use it at Your Own Risk

This guide is useful for setting Wireless Modem HUAWEI ETS2551 dialup connection provided by PTCL in Pakistan or with any other service provider in any other Country (Just u can try). Can be set on HUAWEI ETS2051/2251 . But not tested on them. OK

Hardware Requirements

* USB/Serial Cable.
* ETS2551 Huawei modem.

System Requirements

* Linux with kernel above 2.6.** (Check it by command in console uname -a).
(Personally Tested on Suse 10.1 and FC5 with ETS2551)

Let's Start

It is well assumed that Linux is up on your system and your USB/Serial cable is plugged in.
Now in console type command dmesg -c search for the following lines

ti_usb_3410_5052 1-1:2.0: TI USB 3410 1 port adapter converter detected
usb 1-1: TI USB 3410 1 port adapter converter now attached to /dev/ttyUSB0

If u even see ttyUSB0 in the kernel message then also your modem is detected and you are ready to start,now just configure your wvdial.conf in /etc and start your dialup.

If not then possibly u will be seeing the following error messages in bundle but i will paste only two lines here.

ti_usb_3410_5052 1-1:1.0: TI USB 3410 1 port adapter converter detected

ti_usb_3410_5052: probe of 1-1:1.0 failed with error -5

Hello My Friends : ===> Note that the problem is only the USB/Serial Cable not the HUAEWI modem OK.

Now we have to make one rule file in /etc/udev/rules.d/026_ti_usb_3410.rules .In console login as a root

su

password *****

cd /etc/udev/rules.d/

vi 026_ti_usb_3410.rules (Now Paste the following lines in it)

#TI USB 3410

SUBSYSTEM=="usb_device" ACTION=="add" SYSFS{idVendor}=="0451",SYSFS{idProduct}=="3410" \

SYSFS{bNumConfigurations}=="2" \

SYSFS{bConfigurationValue}=="1" \

RUN+="/bin/sh -c 'echo 2 > /sys%p/device/bConfigurationValue'"

SAVE AND EXIT

Now once again plug out ur USB/Serial cable and then plugin.

Again type dmesg -c in console

Check the kernel message and find the following line

ti_usb_3410_5052 1-1:2.0: TI USB 3410 1 port adapter converter detected
usb 1-1: TI USB 3410 1 port adapter converter now attached to /dev/ttyUSB0

CONGRATULATIONS it is finally done.

Now edit your /etc/wvdial.conf (Mine as a Sample below working fine)

My /etc/wvdial.conf

[Dialer ptcl]

Modem = /dev/ttyUSB0

Baud = 230400

Phone = #777

Init1 = ATZ

Stupid Mode = 1

Dial Command = ATDT

Username = vwireless@ptcl.com

Password = ptcl

PPPD Options = crtcts multilink usepeerdns lock defaultroute

Important Note: Stupid Mode should be set to 1 otherwise the hash sign # with Dialing phone number will not be treated by wvdial. OK.

LAST PROBLEM.

When u will connect to ptcl with wvdial ptcl command as a root , it will not browse any page and will disconnect.

You have to set the nameserver in the /etc/resolv.conf .You can get the nameserver IPs from the terminal window when wvdial is trying to connect to your ISP.

Put those two nameserver in /etc/reslov.conf.

Now again as a root in console wvdial ptcl. .

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