How many use linux

How do I count how many processes are running in Linux?

Viewing running processes in Linux

The ps command used to list the currently running processes and their PIDs in Linux and Unix-like systems. At a bare minimum, two processes displayed on the screen. For example, bash and ps might default on Linux when you just type ps command ps
Sample outputs:

Counts for each file in Linux

The wc is an acronym for word count. By default, wc command counts the number of lines, words, and characters in the text. For examples, show the newline counts
echo «line 1» | wc -l
To print the byte counts
echo «Hello» | wc -c
One can print the word counts as follows:
echo «Hello world» | wc -w

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Find how many processes are running in Linux

One can use the ps command along with with the wc command to count the number of processes running on your Linux based system by any user. It is best to run the following commands as root user using the sudo command.

Command to count the number of processes running in Linux

The Linux syntax is as follows:
# ps -e | wc -l
To see and count every process on the system using BSD syntax:
# ps axu | wc -l
Want to see and count every process running as vivek (real and effective ID) in user format, run:
$ ps -U vivek -u vivek u | wc -l
Another example for www-data user:
$ ps -U www-data -u www-data u | wc -l
In short to see and count only processes by a certain user naned root, you can use the following command:
sudo ps -U root | wc -l
sudo ps -U root -u root u | wc -l
Next we are going count process IDs of nginx using the following syntax:
ps -C nginx | wc -l
ps -C nginx -o pid= | wc -l

Pass the —no-headers or —no-heading to print no header line at all to get processes count correctly on Linux:
# ps -e —no-headers | wc -l
52
# ps -e | wc -l
53
When count real number of nginx it is a good idea to remove grep command while grepping using ps command:
ps -e —no-headers | grep [n]ginx
ps -e —no-headers | grep [n]ginx | wc -l

Understanding the wc command options

wc option	description
-c	Print the byte counts
-m	Print the character counts
-l	Print the newline counts
-w	print the word counts
—help	Display the wc command help and exit

Understanding the ps command options

ps option	description
-e	Select all processes (GNU/Linux syntax)
aux	Select all processes using BSD syntax
-U user	Select by real user ID (RUID) or name
-u user	Select by effective user ID (EUID) or name
-C cmdlist	Select by command name. This selects the processes whose executable name is given in cmdlist
—no-headers	Print no header line at all. —no-heading is an alias for this option

Conclusion

You learned how to list the number of processes running on the Linux or Unix like system using various command-line options. See the gnu ps help page here.

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Linux Statistics: Market Share, Usage, and Fun Facts

Linux belongs to a family of Unix operating systems founded by Linus Torvalds in 1991. Despite being one of the oldest operating systems, Linux is still well-known and widely used by many people.

What’s more, Linux is an open-source that comes entirely for free and is similar to other famous competitors, such as Mac and Microsoft Windows.

If you want to learn more about this fantastic operating system, we have compiled a list of the most fascinating Linux statistics and facts.

Let’s dive right into it.

Top Linux Statistics | Editor’s Choice

• 54.2% of the most powerful supercomputersoperated on Linux in 2020.
• 90% of public cloud workloads are run on Linux.
• Android constitutes 71.93% of the operating system market share.
• Linux makes up only 1.30% of the desktop and laptop operating system market share.
• According to 83.1% of professional developers, Linux is the most loved platform.
• 59% of Ubuntu users prefer the English language.
• In 2021, the Linux kernel counts 27.8 million lines of code.
• Linux games on Steam account for 50,361.

General Linux Facts for Beginners

How many people use Linux? What makes this operating system so unique? These are only some of the questions that easily come to mind. So, that’s why this list of stats will give you a better insight into this powerful operating system.

1. Only two out of the 25 most popular websites worldwide don’t use Linux.

Developers can make several uses of the Linux operating system . It’s important to note that 23 out of 25 most popular websites in the world use Linux. Giants such as Google, Youtube, Tmall, Qq, and Baidu are on top of the list of Linux users.

2. In 2020, 54.2% of the most powerful supercomputers operated on Linux.

This is one of the best-known common facts about Linux . It’s quite impressive that all supercomputers run on Linux from 2018 on.

Supercomputers are considered a significant technological breakthrough, which shows how vital Linux is in today’s digital era.

3. About 90% of the public cloud workload is run by Linux.

Linux’s stability and strength come from its supporters and open-source design. According to Linux cloud statistics , this operating system updates its central code every 10 weeks. That’s why Linux is an excellent operating system for public clouds.

4. As a Linux subcategory, Ubuntu accounts for 46% of its usage rate.

Fun facts of Linux indicate that the operating system is running 32.9% of all websites. While Ubuntu is the leading Linux subcategory, Debian ranks second, with 15.3% of the total Linux usage. CentOS comes in third place, making up 10.7%.

As the same Linux server statistics show, there are less common subcategories, such as Gentoo, Red Hat, and Fedora.

5. MX Linux earns the first position of the top Linux distributions in 2021.

Like in the previous years, MX Linux is the most popular Linux distro for this year. According to Linux distribution usage statistics , the reason behind MX Linux’s huge success stands in its high stability, efficiency, elegant desktop, and easy learning curve. Moreover, MX Linux is based on Debian.

6. At least 63 Linux distributions originate from the US.

When it comes to producing Linux distributions, Americans are the most prolific. One of the most exciting things to know about Linux is that Europe is the second region contributing to distributions after the US. Germany ranks second with 25 distributors, followed by Spain and France with 22.

7. 63% of Linux Ubuntu users have one to three CPUs.

These fascinating CPU usage statistics show that most Linux Ubuntu users have at least one CPU. Also known as the central processing unit, the CPU helps computers perform more tasks at once.

These statistics also show that 27% of users have four to six CPUs, while only 8% have seven or more CPUs.

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How to check how many CPUs are there in Linux system

I am a new Linux user. How do you check how many CPUs are there in Linux system using the command line option?

Introduction: One can obtain the number of CPUs or cores in Linux from the command line. The /proc/cpuinfo file stores CPU and system architecture dependent items, for each supported architecture. You can view /proc/cpuinfo with the help of cat command or grep command/egrep command. This page shows how to use /proc/cpuinfo file and lscpu command to display number of processors on Linux.

Tutorial details
Difficulty level	Easy
Root privileges	Yes
Requirements	None
Est. reading time	3 minutes

How do you check how many CPUs are there in Linux system?

You can use one of the following command to find the number of physical CPU cores including all cores on Linux:

1. lscpu command
2. cat /proc/cpuinfo
3. top or htop command
4. nproc command
5. hwinfo command
6. dmidecode -t processor command
7. getconf _NPROCESSORS_ONLN command

Let us see all commands and examples in details.

How to display information about the CPU on Linux

Just run the lscpu command:
$ lscpu
$ lscpu | egrep ‘Model name|Socket|Thread|NUMA|CPU\(s\)’
$ lscpu -p

The output clearly indicate that I have:

1. CPU model/make: AMD Ryzen 7 1700 Eight-Core Processor
2. Socket: Single (1)
3. CPU Core: 8
4. Thread per core: 2
5. Total threads: 16 ( CPU core[8] * Thread per core [2])

Use /proc/cpuinfo to find out how many CPUs are there in Linux

Run top or htop command to obtain the number of CPUs/cores in Linux

Execute nproc print the number of CPUs available on Linux

Let us print the number of installed processors on your system i.e core count:
$ nproc —all
$ echo «Threads/core: $(nproc —all)»
Sample outputs:

How to probe for CPU/core on Linux using hwinfo command

$ hwinfo —cpu —short ## short info ##
$ hwinfo —cpu ## detailed info on CPUs ##

Linux display CPU core with getconf _NPROCESSORS_ONLN command

One can query Linux system configuration variables with getconf command:
$ getconf _NPROCESSORS_ONLN
$ echo «Number of CPU/cores online at $HOSTNAME: $(getconf _NPROCESSORS_ONLN)»
Sample outputs:

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dmidecode -t processor command

You can use get BIOS and hardware information with dmidecode command (DMI table decoder) on Linux. To find out how many CPUs are there in Linux system, run:
$ sudo dmidecode -t 4
$ sudo dmidecode -t 4 | egrep -i ‘core (count|enabled)|thread count|Version’

Here is a quick video demo of lscpu and other commands:

Conclusion

You learned how to display information about the CPU architecture, core, threads, CPU version/model, vendor and other information using various Linux command line options.

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​How many Linux users are there anyway?

It depends on how you count them.

I was talking to a friend the other day when he said there were no more than 0.0001 percent Linux users. So, so wrong.

Open Source

True, desktop Linux has never taken off. But, even so, Linux has millions of desktop users. Don’t believe me? Let’s look at the numbers.

You see, NetMarketShare doesn’t simply count PCs which connect to its network of over 40,000 websites using HitsLink Analytics and SharePost. Its methodology is to «collect data from the browsers of site visitors» and it then weights the data by country. «We compare our traffic to the CIA Internet Traffic by Country table, and weight our data accordingly. For example, if our global data shows that Brazil represents 2% of our traffic, and the CIA table shows Brazil to represent 4% of global internet traffic, we will count each unique visitor from Brazil twice.»

Another analysis company which is frequently cited for operating system numbers is StatCounter. By its count desktop Linux has 1.48 percent, with Chrome OS coming in at 1.03 percent. StatCounter claims its numbers are derived from raw browser hits from racking code, which is installed on more than 2 million sites.

Perhaps the most unbiased numbers are from the federal government’s Digital Analytics Program (DAP). DAP’s numbers come from the billion visits over the past 90 days to over 400 US executive branch government domains. That’s about 5,000 total websites. These visitors appear to be largely US citizens. You can see this from the most popular websites: The US Postal Service, the IRS, and Medline Plus.

By DAP’s count, Linux is bundled in with 0.6 percent other. Chrome OS, according to DAP, has more users: 1.3 percent.

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Linux: Find Out How Many File Descriptors Are Being Used

W hile administrating a box, you may wanted to find out what a processes is doing and find out how many file descriptors (fd) are being used. You will surprised to find out that process does open all sort of files:
=> Actual log file

=> Library files /lib /lib64

=> Executables and other programs etc

In this quick post, I will explain how to to count how many file descriptors are currently in use on your Linux server system.

Step # 1 Find Out PID

To find out PID for mysqld process, enter:
# ps aux | grep mysqld
OR
# pidof mysqld
Output:

Step # 2 List File Opened By a PID # 28290

Use the lsof command or /proc/$PID/ file system to display open fds (file descriptors), run:
# lsof -p 28290
# lsof -a -p 28290
OR
# cd /proc/28290/fd
# ls -l | less
You can count open file, enter:
# ls -l | wc -l

Tip: Count All Open File Handles

To count the number of open file handles of any sort, type the following command:
# lsof | wc -l
Sample outputs:

List File Descriptors in Kernel Memory

Type the following command:
# sysctl fs.file-nr
Sample outputs:

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1. 1020 The number of allocated file handles.
2. 0 The number of unused-but-allocated file handles.
3. 70000 The system-wide maximum number of file handles.

You can use the following to find out or set the system-wide maximum number of file handles:
# sysctl fs.file-max
Sample outputs:

More about /proc/PID/file & procfs File System

/proc (or procfs) is a pseudo-file system that it is dynamically generated after each reboot. It is used to access kernel information. procfs is also used by Solaris, BSD, AIX and other UNIX like operating systems. Now, you know how many file descriptors are being used by a process. You will find more interesting stuff in /proc/$PID/file directory:

• /proc/PID/cmdline : process arguments
• /proc/PID/cwd : process current working directory (symlink)
• /proc/PID/exe : path to actual process executable file (symlink)
• /proc/PID/environ : environment used by process
• /proc/PID/root : the root path as seen by the process. For most processes this will be a link to / unless the process is running in a chroot jail.
• /proc/PID/status : basic information about a process including its run state and memory usage.
• /proc/PID/task : hard links to any tasks that have been started by this (the parent) process.

See also: /proc related FAQ/Tips

/proc is an essentials file system for sys-admin work. Just browser through our previous article to get more information about /proc file system:

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