Obtaining real-time values of system parameters or events (processor load, server responsiveness, intrusion attempts, …), or getting alerted when certain events happen

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7
votes
3answers
1k views

How to run a command when a directory's contents are updated?

There is a directory A whose contents are changed frequently by other people. I have made a personal directory B where I keep all the files that have ever been in A. Currently I just occasionally ...
13
votes
4answers
3k views

Is it possible to find out what program or script created a given file?

Three files have suddenly appeared in my home directory, called "client_state.xml", "lockfile", and "time_stats_log". The last two are empty. I'm wondering how they got there. It's not the first time ...
22
votes
5answers
12k views

Determine which process is creating a file

Given file path, how can I determine which process creates it (and/or reads/writes to it)?
14
votes
3answers
2k views

Determining Specific File Responsible for High I/O

This is a simple problem but the first time I've ever had to actually fix it: finding which specific files/inodes are the targets of the most I/O. I'd like to be able to get a general system overview, ...
11
votes
9answers
4k views

Ensure a process is always running

I started hosting sites a while back using Cherokee. For external sources (FastCGI, etc) it has an option to launch the process if it can't find one running on the designated socket or port. This is ...
9
votes
6answers
3k views

Is there a tool that allows logging of memory usage?

I want to monitor memory usage of a process, and I want this data to be logged. Does such a tool exist?
7
votes
3answers
544 views

Forcing an 'added' alias to every command

Is it possible to forcibly add a timing alias (for lack of a better way to phrase it) to every command in bash? For example, I would like to have a specific user who whenever a command is run, it is ...
2
votes
2answers
351 views

Is there a log of past threads that are now closed?

Sometimes, I have a rogue Java process which takes up 100% of my CPU and makes it jump about 30C in temperature (usually resulting in a crash if not killed). Problem is, I can never really identify ...
28
votes
5answers
32k views

How to monitor CPU/memory usage of a single process?

I would like to monitor one process's memory / cpu usage in real time. Similar to top but targeted at only one process, preferably with a history graph of some sort.
14
votes
5answers
22k views

Script to monitor folder for new files?

How do I detect new files in a folder with a bash script? I would like to process the files as soon as they are created in the folder. Is this possible to do so or do I have to schedule a script with ...
9
votes
5answers
842 views

Monitoring activity on my computer.

So recently I found that someone has been using my computer without consent, browsing folders, etc.... I could change all my passwords straight away, but I'm curious as the what the intruding party ...
11
votes
5answers
2k views

What happens when I open and read from /proc?

Does the hard drive need to be accessed or is everything done in memory? Basically I would like to constantly get updated values from meminfo and cpuinfo. Do I need to reopen the file and then reread ...
5
votes
2answers
463 views

Is it possible to follow a command (run repeatedly)? as one would follow a file using tail -f?

I have a script which produces a file 'Detail.out'. I know that the script is completed whenever the file contains a certain number of lines (roughly 21025). So I find myself sitting at the command ...
4
votes
2answers
8k views

What can I use to monitor and log incoming/outgoing traffic to/from remote hosts?

I run a web server (Debian Squeeze on a VPS), and the graphs provided by the hosting company show consistently that around twice as much traffic is incoming to the server compared to the outgoing ...
4
votes
2answers
1k views

Access history of a file

I was wondering if there are any tools to keep track of the access history of a file. I know of stat, but as far as I understand, it only returns information about the last time the file was accessed. ...
17
votes
1answer
2k views

Why isn't a straightforward 1/5/15 minute moving average used in Linux load calculation?

Until recently i thought the load average (as shown for example in top) was a moving average on the n last values of the number of process in state "runnable" or "running". And n would have been ...
19
votes
3answers
9k views

How does the “tail” command's “-f” parameter work?

$ tail -f testfile the command is supposed to show the latest entries in the specified file, in real-time right? But that's not happening. Please correct me, if what I intend it to do is wrong... I ...
9
votes
2answers
6k views

Linux: Writing a watchdog to monitor multiple processes

A few years ago, a coworker came up with an elegant solution for a watchdog program. The program ran on Windows and used Windows Event objects to monitor the process handles (PID’s) of several ...
9
votes
2answers
184 views

How do I get the current bandwidth speed of an interface from the terminal?

I want to get the current Bandwidth of an interface say "eth0" from the terminal. It better be as simple as possible. Say up 10 dn 30. Instead of giving out a lot of text like "vnstat" does. ...
11
votes
5answers
417 views

Which application should I blame for compulsively creating a directory again and again?

There's an application on my system which keeps creating an empty ~/Desktop directory again and again. I can't stand capital letters in my home, nor I can stand this “desktop” thingy. So, as picky as ...
4
votes
1answer
108 views

Is there a tool for tracking uptimes across reboots?

A tool such as this might on the surface appear to serve no real useful purpose, but people that take care of systems like to brag, and uptime is just one of those things that they like to brag about ...
2
votes
1answer
381 views

Writing triggers for mcelog

Just starting to look into mcelog for the first time (I've enabled it and seen syslog output before, but this is the first time I'm trying to do something non-default). I'm looking for information on ...
7
votes
3answers
2k views

How do you choose which monitoring application to use?

Having a system for collecting performance statistics can be extremely useful. In the past, I've used Munin for this, and it has been invaluable in analyzing bottlenecks and various other issues. I ...
4
votes
4answers
11k views

Linux file access monitoring

Is there any way in unix to find out who accessed certain file in last 1 week? It may be user or some script ftp it to some other place. Can I get a list of user name who accessed certain file? How ...
3
votes
3answers
7k views

Find out network traffic per IP

We have one central server which functions as an internet gateway. This server is connected to the internet, and using iptables we forward traffic and share the internet connection among all computers ...
15
votes
3answers
5k views

List the files accessed by a program

time is a brilliant command if you want to figure out how much CPU time a given command takes. I am looking for something similar that can list the files being accessed by a program and its children. ...
14
votes
3answers
2k views

Monitor what is being sent to /dev/null?

Just for fun: Is there a way to monitor/capture/dump whatever is being written to /dev/null? On Debian, or FreeBSD, if it matters, any other OS specific solutions are also welcome.
7
votes
3answers
3k views

How can I monitor disk I/O in a particular directory?

I've got a few processes with a known name that all write to files in a single directory. I'd like to log the number of disk block reads and writes over a period (not just file access) to test whether ...
7
votes
2answers
461 views

Overheating results in system shutdown

I have been having an overheating issue which makes my laptop shutdown immediately. Is there anyway to monitor the temperature from the sensor and scale down the CPU frequency to avoid that problem? ...
5
votes
3answers
29k views

How can I see what processes are running?

I use Ubuntu Server 10.10 and I would like to see what processes are running. I know that PostgreSQL is running on my machine but I can not see it with the top or ps commands, so I assume that they ...
5
votes
1answer
2k views

Monitoring USB traffic

Kernel version: 2.6.31-22 I wish to monitor the USB traffic to and from a device. I've searched, but different sites seem to give different information and I'm confused. Some sites suggest that I ...
4
votes
1answer
2k views

User's executed commands log file

In Unix based systems, is there a log file that stores user's executed command(s)?
4
votes
2answers
2k views

How can I have activity in a Dropbox folder logged?

I have a folder shared with others through Dropbox. When a file is added to this folder, I get a system tray notification in KDE --- but of course if I'm not at my computer, I wouldn't see the ...
2
votes
7answers
1k views

Linux server monitoring software

The dedicated server I'm looking after started to crash occasionally, I suspect because of overload, so I need some performance/resource based monitoring software, preferably with web interface, ...
4
votes
5answers
453 views

Unpredictable memory explosions

The main server at my company has recently been having a lot of downtime. For reasons that neither I nor the other admins can determine, it has random (VERY sudden) explosions in memory. It becomes ...
4
votes
5answers
409 views

performance monitoring

Is there some performace monitoring tool which would run in background gathering info about all system activity? Somethimes my system (Arch linux, 32 bit) slows down terribly and the top utility ...
2
votes
3answers
259 views

List all open '.log' files in *nix

There are times as a system administrator, you might not be sure of the log file paths of a new application. Depending on the system, there may be multiple ways to find the same. Please share the ...
4
votes
5answers
394 views

Network monitoring tool

I'm basically looking for a utility that displays which processes are using how much bandwidth, similar to how top displays which processes use how much resources.
3
votes
3answers
152 views

Needed: A simple way to remotely monitor a process on my server

I have a cloud-based server running a Java process (a POP/SMTP server called davmail, details don't really matter). What is the simplest way to monitor the status of that Java process remotely? I ...
2
votes
2answers
250 views

Monitor single process to logfile perodicly

Based on this question, I would like to log the performance of a specific process, with a frequency of say one second, to a csv (comma separated value) log file. Something like: ...
2
votes
2answers
651 views

Bandwith monitoring in Linux

I just need to get how much bandwidth is used in 3 or 4 days. Do you have any application in the terminal to do it? I'd prefer if it didn't use SNMP. I found iptraf, wireshark, cacti, but they were ...
1
vote
2answers
855 views

How to know recently updated files

If I run iostat -x 1 I saw ocassionally large 5MB to 10MB writes. What files are being written? I want to check the recently created files with size over 5MB for example. How would I do so?