bash - Health check of web page using curl - Unix & Linux Stack Exchange
But you can also edit the command line (see the guide to More UNIX). There are many more options, for example to list files by size, by date, recursively etc. more will get you one level up from your current position. You may need to kill processes for example if your modem connection was interrupted and you didn't. Jan 31, To see the time in the UTC timezone, use the command date --utc (or shorthand date -u). To write the current system time to the hardware clock so that it can servers you can connect to, the best source is mawatari.info Example usage: # reqs-per-sec -f 15 -i /var/www/http/mawatari.info # # Author: Adam Franco # Date: # License: mawatari.info GNU . requests ago, and uses the time recorded to compare with the current time. # This check is needed because if the logs have just rolled over, then we need a.
Note that some of these commands are different on non-Solaris machines - see SunOS differences. If you've made a typo, the easiest thing to do is hit CTRL-u to cancel the whole line. Files ls lists your files ls -l lists your files in 'long format', which contains lots of useful information, e.
There are many more options, for example to list files by size, by date, recursively etc. Just hit the space bar to see more or q to quit. See the emacs page. It is wise to use the option rm -i, which will ask you for confirmation before actually deleting anything. You can make this your default by making an alias in your. The default is that only you can look at them and change them, but you may sometimes want to change these permissions.
Note that for someone to be able to actually look at the file the directories it is in need to be at least executable. See help protection for more details.
File Compression gzip filename compresses files, so that they take up much less space. Usually text files compress to about half their original size, but it depends very much on the size of the file and the nature of the contents.
linux - How do I check how many HTTP connections are open currently? - Server Fault
There are other tools for this purpose, too e. Gzip produces files with the ending '. You can even print it directly, using gzcat filename lpr printing lpr filename print. Use the -P option to specify the printer name if you want to use a printer other than your default printer.
For example, if you want to print double-sided, use 'lpr -Pvalkyr-d', or if you're at CSLI, you may want to use 'lpr -Pcordd'. See 'help printers' for more information about printers and their locations. You can find the job number by using lpq. Theoretically you also have to specify a printer name, but this isn't necessary as long as you use your default printer in the department.
You can use dviselect to print only selected pages.
See the LaTeX page for more information about how to save paper when printing drafts. Directories Directories, like folders on a Macintosh, are used to group files together in a hierarchical structure. You basically 'go' to another directory, and you will see the files in that directory when you do 'ls'.
You always start out in your 'home directory', and you can get back there by typing 'cd' without arguments.
Find number of active connections in Linux using netstat
You don't have to walk along step by step - you can make big leaps or avoid walking around by specifying pathnames. Finding things ff find files anywhere on the system. This can be extremely useful if you've forgotten in which directory you put a file, but do remember the name.
In fact, if you use ff -p you don't even need the full name, just the beginning. This can also be useful for finding other things on the system, e. This can be useful a lot of purposes, e. Check out the man pages if this sounds good to you. About other people w tells you who's logged in, and what they're doing. This allows you to see whether they're actually sitting there typing away at their keyboards right at the moment. Useful if you're looking for someone who's actually physically in the same building as you, or in some other particular location.
Often people put other practical information, such as phone numbers and addresses, in a file called. This information is also displayed by 'finger'. Sometimes very hand but that's not what this is about. We want to get some solid numbers so we can take a broader perspective. To do this we can use the following command: But we can take this one step further even. Lets say you only wanted to see traffic comming across port 80 standard http.
How to get "requests per second" for Apache in Linux? - Stack Overflow
We can grep our netstat then count it like so: It is often extremely useful to see what those connections are doing, especially when you think you might just have tons of open connections that are idle and are trying to tweak your settings.
It's been known to happen where you have a really busy web server for instance, and maybe it's running a lot of database connections to the same box, then stopping.
A quick way to return counts on your connections in your linux environment. Note the netstat command is standard on most operating systems, including windows, but you may need to use some other way to count your results Occasionally, when using netstat you may only care about ports that you are listening on.
This is especially important if you are running a server that isn't behind a firewall because it helps you determine what you may be vulnerable to that you aren't aware of.