Forwarded from hosein seilany https://seilany.ir/
Forwarded from hosein seilany https://seilany.ir/
Forwarded from hosein seilany https://seilany.ir/
sudo add-apt-repository ppa:gerardpuig/ppa
sudo apt update
sudo apt install ubuntu-cleaner
sudo apt update
sudo apt install ubuntu-cleaner
Forwarded from C For Learn
Linux Pocket Guide, 3rd Edition.pdf
4.1 MB
Forwarded from hosein seilany https://seilany.ir/
جان فون نویمن خالق معماری Von Neumann بوده و در طراحی و ساخت اولین کامپیوتر بنام ایناک سهم مهمی داشته است. این معماری باعث ذخیره سازی برنامه ها در حافظه کامپیوتر می شود.
Forwarded from hosein seilany https://seilany.ir/
قبل از ابداع زبان برنامه نویسی فورترن، برنامه نویسی بسیار مشکل و طاقت فرسا بود. جان وارنر بکوس دانشمندی آمریکایی بود و رهبری گروهی را برعهده داشت که اولین زبان برنامه نویسی سطح بالا (high-level programming language) را ایجاد کردند. همچنین مخترع فرم بکوس-نائو (BNF) نیز بود که تقریباٌ پر استفاده ترین نمادگر برای تعریف نحو (Syntax) زبانهای صوری است .
Forwarded from hosein seilany https://seilany.ir/
کن تامسون و دنیس مک آلیستر ریچی دو دانشمند آمریکایی هستند که سیستم عامل یونیکس را طراحی نمودند. ریچی به همراه فردی دیگر بنام برایان کرنیگان زبان برنامه نویسی C را طراحی کردند. تامسون هم زبان B را نوشت که سیستم عامل هایی بر اساس این زبانهای برنامه نویسی طراحی و پیاده سازی گردید .
Forwarded from hosein seilany https://seilany.ir/
Ken Thompson and Dennis Ritchie
Unix (1969), B (1969) and C (1972) programming languages
Unix (1969), B (1969) and C (1972) programming languages
Forwarded from فرهنگ گستر کرمان (Amir bakhshaei)
Forwarded from hosein seilany https://seilany.ir/
یکی از مراحل جذب نیرو در دنیا، مصاحبه های شغلی می باشد و یکی از بخش های این مصاحبه مربوط به حوزه فنی است.
در هر شغلی مباحث فنی و گاها مدیریتی خاص آن رشته از کاندیدای پذیرش آن شغل پرسیده می شود.
در ادامه مروری بر50 سوال برتر و شایعه ای که از یک متخصص لینوکس در حوزه System Administration در مصاحبه های استاندارد و بین المللی پرسیده شده است، خواهیم داشت.
احتمالا این سوالات برای متخصصان دنیای لینوکس و کسانی که میخواهند در مصاحبه این رشته شرکت کنند، جالب خواهد بود.
1. What does nslookup do?
2. How do you display the top most process utilizing CPU process?
3. How to check all open ports on a Linux machine and block the unused ports?
4. What is Linux? How is it different from UNIX?
5. Explain the boot process of Unix System in details.
6. How do you change the permissions? How to create a file that’s read-only property?
7. Explain SUDO in detail. What are its disadvantages?
8. What is the difference between UDP and TCP?
9. Describe the boot order of a Linux machine.
10. Design a 3-tier web application.
11. Sketch how you would route network traffic from the internet into a few subnets.
12. How do you know about virtualization? Is it good to use?
13. What are different levels of RAID and what level will you use for a web server and database server?
14. List some latest developments in open source technologies.
15. Have you ever contributed to an open source project?
16. Systems engineer or a systems administrator? Explain?
17. List some of the common unethical practices followed by a system professional.
18. What is the common size for a swap partition under a Linux system?
19. What does a nameless directory represent in a Linux system?
20. How to list all files, including hidden ones, in a directory?
21. How to add a new system user without login permissions?
22. Explain a hardlink. What happens when a hardlink is removed?
23. What happens when a sysadmin executes this command: chmod 444 chmod
24. How do you determine the private and public IP addresses of a Linux system?
25. How do you send a mail attachment using bash?
26. Tell me something about the Linux distros used on servers.
27. Explain the process to re-install Grub in Linux in the shortest manner.
28. What is an A record, an NS record, a PTR record, a CNAME record, an MX record?
29. What is a zombie process? State its causes?
30. When do we prefer a script over a compiled program?
31. How to create a simple master/slave cluster?
32. What happens when you delete the source to a symlink?
33. How to restrict an IP so that it may not use the FTP Server?
34. Explain the directory structure of Linux. What contents go in /usr/local?
35. What is git? Explain its structure and working.
36. How would you send an automated email to 100 people at 12:00 AM?
37. Tell me about ZFS file system.
38. How to change the default run level in a Linux system?
39. How would you change the kernel parameters in Linux?
40. State the differences between SSH and Telnet.
41. How would you virtualize a physical Linux machine?
42. Tell me about some quirky Linux commands.
43. Explain how HTTPS works.
44. Do you know about TOR browser? Explain its working.
45. How to trigger a forced system check the next time you boot your machine?
46. What backup techniques do you prefer?
47. Tell me something about SWAP partition.
48. Explain Ping of Death attack.
49. How do you sniff the contents of an IP packet?
50. Which OSI layer is responsible for making sure that the packet reaches its correct destination?
با تشکر از :فرزاد نیرومقام
در هر شغلی مباحث فنی و گاها مدیریتی خاص آن رشته از کاندیدای پذیرش آن شغل پرسیده می شود.
در ادامه مروری بر50 سوال برتر و شایعه ای که از یک متخصص لینوکس در حوزه System Administration در مصاحبه های استاندارد و بین المللی پرسیده شده است، خواهیم داشت.
احتمالا این سوالات برای متخصصان دنیای لینوکس و کسانی که میخواهند در مصاحبه این رشته شرکت کنند، جالب خواهد بود.
1. What does nslookup do?
2. How do you display the top most process utilizing CPU process?
3. How to check all open ports on a Linux machine and block the unused ports?
4. What is Linux? How is it different from UNIX?
5. Explain the boot process of Unix System in details.
6. How do you change the permissions? How to create a file that’s read-only property?
7. Explain SUDO in detail. What are its disadvantages?
8. What is the difference between UDP and TCP?
9. Describe the boot order of a Linux machine.
10. Design a 3-tier web application.
11. Sketch how you would route network traffic from the internet into a few subnets.
12. How do you know about virtualization? Is it good to use?
13. What are different levels of RAID and what level will you use for a web server and database server?
14. List some latest developments in open source technologies.
15. Have you ever contributed to an open source project?
16. Systems engineer or a systems administrator? Explain?
17. List some of the common unethical practices followed by a system professional.
18. What is the common size for a swap partition under a Linux system?
19. What does a nameless directory represent in a Linux system?
20. How to list all files, including hidden ones, in a directory?
21. How to add a new system user without login permissions?
22. Explain a hardlink. What happens when a hardlink is removed?
23. What happens when a sysadmin executes this command: chmod 444 chmod
24. How do you determine the private and public IP addresses of a Linux system?
25. How do you send a mail attachment using bash?
26. Tell me something about the Linux distros used on servers.
27. Explain the process to re-install Grub in Linux in the shortest manner.
28. What is an A record, an NS record, a PTR record, a CNAME record, an MX record?
29. What is a zombie process? State its causes?
30. When do we prefer a script over a compiled program?
31. How to create a simple master/slave cluster?
32. What happens when you delete the source to a symlink?
33. How to restrict an IP so that it may not use the FTP Server?
34. Explain the directory structure of Linux. What contents go in /usr/local?
35. What is git? Explain its structure and working.
36. How would you send an automated email to 100 people at 12:00 AM?
37. Tell me about ZFS file system.
38. How to change the default run level in a Linux system?
39. How would you change the kernel parameters in Linux?
40. State the differences between SSH and Telnet.
41. How would you virtualize a physical Linux machine?
42. Tell me about some quirky Linux commands.
43. Explain how HTTPS works.
44. Do you know about TOR browser? Explain its working.
45. How to trigger a forced system check the next time you boot your machine?
46. What backup techniques do you prefer?
47. Tell me something about SWAP partition.
48. Explain Ping of Death attack.
49. How do you sniff the contents of an IP packet?
50. Which OSI layer is responsible for making sure that the packet reaches its correct destination?
با تشکر از :فرزاد نیرومقام
Forwarded from hosein seilany https://seilany.ir/
مبحث OpenStack و Edge Computing✨
پیش از این در پست‌هایی رایانش ابری (Cloud Computing)را بررسی نموده‌ایم اما مفهوم دیگری با نام رایانش در لبه (Edge Computing) نیز تعریف شده است که ایده اصلی آن پردازش در نزدیکی منبع تولید اطلاعات است. دقت داشته باشید که رایانش در لبه به هیچ وجه نسخه جایگزین یا نسخه تکمیل شده رایانش ابری نیست و در بسیاری از مواردی که نیاز به پردازش در لبه احساس می شود همزمان وجود رایانش ابری نیز لازم است (عکس زیر را ملاحظه نمایید). با گسترش تجهیزات اینترنت اشیا (IOT Devices) نیاز به رایانش در لبه نیز افزایش خواهد یافت و در نتیجه سرعت محاسبات افزایش چشمگیری خواهد داشت. در نسخه آخر پروژه معروف OpenStack که پیش از این آن را به عنوان یک پلتفرم رایانش ابری می‌شناختیم به رایانش در لبه نیز توجه ویژه‌ای شده است و دو سرویس جدید با نامهای OpenStack-Helm و LOCI در راستای تطابق و سازگاری بیشتر با این ایده معرفی شده‌اند. برای بررسی ویژگی های نسخه Queen، آخرین نسخه منتشر شده OpenStack به این لینک مراجعه نمایید:
https://www.openstack.org/software/queens
پیش از این در پست‌هایی رایانش ابری (Cloud Computing)را بررسی نموده‌ایم اما مفهوم دیگری با نام رایانش در لبه (Edge Computing) نیز تعریف شده است که ایده اصلی آن پردازش در نزدیکی منبع تولید اطلاعات است. دقت داشته باشید که رایانش در لبه به هیچ وجه نسخه جایگزین یا نسخه تکمیل شده رایانش ابری نیست و در بسیاری از مواردی که نیاز به پردازش در لبه احساس می شود همزمان وجود رایانش ابری نیز لازم است (عکس زیر را ملاحظه نمایید). با گسترش تجهیزات اینترنت اشیا (IOT Devices) نیاز به رایانش در لبه نیز افزایش خواهد یافت و در نتیجه سرعت محاسبات افزایش چشمگیری خواهد داشت. در نسخه آخر پروژه معروف OpenStack که پیش از این آن را به عنوان یک پلتفرم رایانش ابری می‌شناختیم به رایانش در لبه نیز توجه ویژه‌ای شده است و دو سرویس جدید با نامهای OpenStack-Helm و LOCI در راستای تطابق و سازگاری بیشتر با این ایده معرفی شده‌اند. برای بررسی ویژگی های نسخه Queen، آخرین نسخه منتشر شده OpenStack به این لینک مراجعه نمایید:
https://www.openstack.org/software/queens
OpenStack
OpenStack Queens - OpenStack Open Source Cloud Computing Software
OpenStack Queens logo
Forwarded from hosein seilany https://seilany.ir/
یکی از مراحل جذب نیرو در دنیا، مصاحبه های شغلی می باشد و یکی از بخش های این مصاحبه مربوط به حوزه فنی است.
در هر شغلی مباحث فنی و گاها مدیریتی خاص آن رشته از کاندیدای پذیرش آن شغل پرسیده می شود.
در ادامه مروری بر50 سوال برتر و شایعه ای که از یک متخصص لینوکس در حوزه System Administration در مصاحبه های استاندارد و بین المللی پرسیده شده است، خواهیم داشت.
احتمالا این سوالات برای متخصصان دنیای لینوکس و کسانی که میخواهند در مصاحبه این رشته شرکت کنند، جالب خواهد بود.
1. What does nslookup do?
2. How do you display the top most process utilizing CPU process?
3. How to check all open ports on a Linux machine and block the unused ports?
4. What is Linux? How is it different from UNIX?
5. Explain the boot process of Unix System in details.
6. How do you change the permissions? How to create a file that’s read-only property?
7. Explain SUDO in detail. What are its disadvantages?
8. What is the difference between UDP and TCP?
9. Describe the boot order of a Linux machine.
10. Design a 3-tier web application.
11. Sketch how you would route network traffic from the internet into a few subnets.
12. How do you know about virtualization? Is it good to use?
13. What are different levels of RAID and what level will you use for a web server and database server?
14. List some latest developments in open source technologies.
15. Have you ever contributed to an open source project?
16. Systems engineer or a systems administrator? Explain?
17. List some of the common unethical practices followed by a system professional.
18. What is the common size for a swap partition under a Linux system?
19. What does a nameless directory represent in a Linux system?
20. How to list all files, including hidden ones, in a directory?
21. How to add a new system user without login permissions?
22. Explain a hardlink. What happens when a hardlink is removed?
23. What happens when a sysadmin executes this command: chmod 444 chmod
24. How do you determine the private and public IP addresses of a Linux system?
25. How do you send a mail attachment using bash?
26. Tell me something about the Linux distros used on servers.
27. Explain the process to re-install Grub in Linux in the shortest manner.
28. What is an A record, an NS record, a PTR record, a CNAME record, an MX record?
29. What is a zombie process? State its causes?
30. When do we prefer a script over a compiled program?
31. How to create a simple master/slave cluster?
32. What happens when you delete the source to a symlink?
33. How to restrict an IP so that it may not use the FTP Server?
34. Explain the directory structure of Linux. What contents go in /usr/local?
35. What is git? Explain its structure and working.
36. How would you send an automated email to 100 people at 12:00 AM?
37. Tell me about ZFS file system.
38. How to change the default run level in a Linux system?
39. How would you change the kernel parameters in Linux?
40. State the differences between SSH and Telnet.
41. How would you virtualize a physical Linux machine?
42. Tell me about some quirky Linux commands.
43. Explain how HTTPS works.
44. Do you know about TOR browser? Explain its working.
45. How to trigger a forced system check the next time you boot your machine?
46. What backup techniques do you prefer?
47. Tell me something about SWAP partition.
48. Explain Ping of Death attack.
49. How do you sniff the contents of an IP packet?
50. Which OSI layer is responsible for making sure that the packet reaches its correct destination?
با تشکر از :فرزاد نیرومقام
در هر شغلی مباحث فنی و گاها مدیریتی خاص آن رشته از کاندیدای پذیرش آن شغل پرسیده می شود.
در ادامه مروری بر50 سوال برتر و شایعه ای که از یک متخصص لینوکس در حوزه System Administration در مصاحبه های استاندارد و بین المللی پرسیده شده است، خواهیم داشت.
احتمالا این سوالات برای متخصصان دنیای لینوکس و کسانی که میخواهند در مصاحبه این رشته شرکت کنند، جالب خواهد بود.
1. What does nslookup do?
2. How do you display the top most process utilizing CPU process?
3. How to check all open ports on a Linux machine and block the unused ports?
4. What is Linux? How is it different from UNIX?
5. Explain the boot process of Unix System in details.
6. How do you change the permissions? How to create a file that’s read-only property?
7. Explain SUDO in detail. What are its disadvantages?
8. What is the difference between UDP and TCP?
9. Describe the boot order of a Linux machine.
10. Design a 3-tier web application.
11. Sketch how you would route network traffic from the internet into a few subnets.
12. How do you know about virtualization? Is it good to use?
13. What are different levels of RAID and what level will you use for a web server and database server?
14. List some latest developments in open source technologies.
15. Have you ever contributed to an open source project?
16. Systems engineer or a systems administrator? Explain?
17. List some of the common unethical practices followed by a system professional.
18. What is the common size for a swap partition under a Linux system?
19. What does a nameless directory represent in a Linux system?
20. How to list all files, including hidden ones, in a directory?
21. How to add a new system user without login permissions?
22. Explain a hardlink. What happens when a hardlink is removed?
23. What happens when a sysadmin executes this command: chmod 444 chmod
24. How do you determine the private and public IP addresses of a Linux system?
25. How do you send a mail attachment using bash?
26. Tell me something about the Linux distros used on servers.
27. Explain the process to re-install Grub in Linux in the shortest manner.
28. What is an A record, an NS record, a PTR record, a CNAME record, an MX record?
29. What is a zombie process? State its causes?
30. When do we prefer a script over a compiled program?
31. How to create a simple master/slave cluster?
32. What happens when you delete the source to a symlink?
33. How to restrict an IP so that it may not use the FTP Server?
34. Explain the directory structure of Linux. What contents go in /usr/local?
35. What is git? Explain its structure and working.
36. How would you send an automated email to 100 people at 12:00 AM?
37. Tell me about ZFS file system.
38. How to change the default run level in a Linux system?
39. How would you change the kernel parameters in Linux?
40. State the differences between SSH and Telnet.
41. How would you virtualize a physical Linux machine?
42. Tell me about some quirky Linux commands.
43. Explain how HTTPS works.
44. Do you know about TOR browser? Explain its working.
45. How to trigger a forced system check the next time you boot your machine?
46. What backup techniques do you prefer?
47. Tell me something about SWAP partition.
48. Explain Ping of Death attack.
49. How do you sniff the contents of an IP packet?
50. Which OSI layer is responsible for making sure that the packet reaches its correct destination?
با تشکر از :فرزاد نیرومقام