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stackexchange.com

https://unix.stackexchange.com/questions/111526/how-can-i-rsync-without-prompt-for-password-without-using-public-key-authentica

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createdtodo.co

https://milkhunter.createdtodo.co/rsync-server-basic-edition/

1. Optimize your Code using Appropriate Algorithm 1. Optimize your Code using Appropriate AlgorithmFor any code you write, you should always take some time to think through and pick the right algorithm to use for your specific scenario.The problem we are going to analyze for this example is to find a maximum value of the function in a two dimensional segment.We’ll consider only whole numbers.First we’ll write the program without consider performance. Then, we’ll discuss few ways to boost the performance of this program.Our Scenario: We have interval for x [-100…100] and interval for y [-100…100]. Now in these two intervals we are looking for a maximum of the function (x*x + y*y)/(y*y + b).This is a function of two variables: x and y. There is one more constant which could be different and user will enter it. This constant b is always greater than 0 and also lesser than 1000.In our program ,we will not use function pow() that is implemented in math.h library. It would be interesting exercise to figure out which approach would create faster code.Example code:Now, if we analyze the code more carefully, we notice that the part for dX*dX is calculated more times than it should, in this case it is calculated 200 times and this is a was of CPU time. What we could do?One of the trick is to create one variable dX_Squer = dX*dX, and calculate after first for repetition, then we could use that in all calculations afterwards. You just need to add one more brackets.There are few more optimizations you can do in the above code, just try to spot them.The next point we could consider is how general our algorithm is, versus how optimal is it from speed point of view.In that case we could apply few algorithms depending on the size of input set. What do we mean by that?For example, in one our earlier c++ articles, we discussed about binary numbers that have only two ones in many zeros.We could use MVA algorithm that could outperform the original algorithm from speed point of view on smaller numbers, the ones that are fit for unsigned long long int, but if you use my algorithm combined with vectors it could be used in some problems where you try to pick two objects that are in set.2. Optimize Your Code for Memory 2. Optimize Your Code for MemoryNow we will look how you could optimize your code from point of memory consumption.Let us take a simple example. Let us try to swap two values in the memory, which is done in many sorting algorithms.Some people like to think of this as two people sitting on two chairs and adding one more chair as temporary holder for one of them during the swap.This is nice. But usage of nTemp which in memory reserves some place that will be used for copy of one variable.This could be done without nTemp like this:In some cases you could have large objects in memory that need to swap their places. So, what could you do? Instead of coping to many memory locations you could use their addresses and instead of replacing all of the memory locations you could just change their address.How do you know if your code is faster and how do you calculate it?Well, when you finish your code it will translate in some assembler and then into something that is called machine code. Each operation is performed in processor or in some other part of computer like mathematical coprocessor or in graphic card or something similar.One operation could be done in one clock circle or few, this is the reason why it could be faster to multiply than to divide, but it could be also important did you pick some optimization done by your compiler.Sometimes, the task of optimization could be left to compiler. For all available C++ compiler, check this GCC Optimization Options.To understand how fast program is, you should know the architecture of a device you are working with. Sometimes things become faster because your program is in the cache memory or you use mathematical coprocessor or because branch predictor got it right most of the times.Now let’s consider these numbers O(n), O(log(n) *n), n*n, n!. To estimate the algorithm according to the size of the input set you use this numbers.If you have an algorithm of size n and you input 10 elements you get time t, and if you input 100 elements you will end up with time 10 times longer than t. If you deal with a program that has equivalent to n*n and you increase the size of set from 10 to 100, the program will not be 10 times slower but rather approximately 10*10 times. You should be aware of these types of limits a number can have on your algorithm.Some people think that they could time the code and have good idea how fast the algorithm is. Ok, let us think. Most of the programs you write are not in kernel mode, which means that they could be stopped by operating system and processor could be given to another task and so on. This means that your program will be stopped and started many times. It could be even tougher to figure out what could happen to program if you have few cores or even processors.Idea of measuring the speed of algorithm is pretty iffy. Well, the results are just useful as a snowflake on a North Pole or like hand of sand in desert.The only good results are if you find a way to prevent your program from losing the core he is in, or perhaps to stop the counter of time and then continue, but you need to eliminate interrupt time that will be added each time you stop your program, as well as the starting initializations.There are also differences you will notice due to the fact that same code will not be transformed into machine code if you apply different optimization, and as you should know that already one product could translate code in different way than some other version, by the way it is important what architecture is it executed as well and also due to installed amount of memory, cache memory, prediction methods, etc.3. printf and scanf Vs cout and cin 3. printf and scanf Vs cout and cinSometimes, if you use different functions for same task you will get faster code.Those first two functions are mostly used in C style of programming, but you could use it sometimes with file manipulation and small difference in speed could add up a lot saved time.For example, let us assume that you have numbers in a file to read.From point of security, cout and cin would be considered as better option for files, as you would have adequate instructions in fstream header.If you use C or printf in C++ you should consider some other functions that could even more increase the speed of your program.For strings you could use puts, gets or their equivalents for file operations. Well they are not formatted and to write data in one way takes some time.4. Using Operators 4. Using OperatorsMost basic operations like +=, -=, and *=, when applied on basic data types could slow down the program as well. To be sure you will need to know how it gets transformed into assembler on your computer.One interesting idea is to replace postfix increment and decrement with their prefix versions.Sometimes you could try to use operators >> or << instead of multiplication or division, but be very careful, you could end up with bad mistake this way, and then to fix it you could add some range estimations and that will be way slower than original code you have started with.Bit operators, and tricks that go with them could increase the speed of program, but you should be very careful because you could end up with machine dependant code and that is something to avoid. To be sure, you could still code with add move from assembler in C++.It is important to understand that this is hybrid language and it will support assembler coding, problem orientated solutions, the object orientated solutions, and if you add some additional libraries you could use some more advanced tricks that are not commonly used.5. if Condition Optimization 5. if Condition OptimizationIf you use if in your code, when possible, it is a good idea to replace if with switch. In “if”, you usually have tests and that could produce code that is bit slower.One good fact to know about if command is to know that it has some of the optimizations built in. Well, if you have few conditions that are connected with && or it could be evaluated that this is true or false without calculating complete expression.Let us illustrate this with two condition that are connected with && operator. If you have expression p and q, as soon as you have p equal to false you know that there is no way to get true as a result, this is used in C/C++ and sometimes it could be reason why people do get wrong code.If you have situations in which you could say that something could occur more often put it before, because there is a better chance to say that expression is false or true. If you have many conditions to calculate, and if they could be sorted, consider splitting that range into few sub ranges first.One bad thing that could happen is that you create the branch that will never be used or even few lines of the code that could be added and you will never use those cases.Sometimes you will have a very long expression composed of many conditions, one could use function that will return true or false, but functions are expensive, they use stack and few copies could be created, if possible you could use a macro or a macro with a variable to increase the speed and create code that will be more easy to maintain.Also, don’t forget that negation is an operation too.6. Problems with Functions 6. Problems with FunctionsWhile using functions, if you are not careful, you might end-up creating a bad code.For example, if you have a code like this, it might be a bad thing.Why? As soon as you code something like this you will have to call DoSomething 10 times, and we have mentioned that function calls could be expensive.To implement this better, you could do it like this, and implement that for repetition in your function.Next thing to consider is inline functions. There is a chance that they will be used like macros if they are small. This way you benefit from point of speed, from point of better organization, and as well as reusability.When passing a big object to a function, you could use pointers or references. Prefer to use references because they would create the code that is way easier to read.If you are not worried about the changing the value that is passed to the function, use references. If you use object that is constant, it could be useful to use const, which will save some time.When you use C that will support C99 standard you have option to use restrict on pointers to.In certain situations casting in function might increase the speed of the code. You should consider this depending on your specific situation.Creating temporary objects in the function could slow the program. I have already shown how you could avoid using temp variable in some situations.Also, while recursion is extremely helpful in certain specific scenarios, in general, it will generate a slow performing code. If possible, try to avoid recursion, when you don’t need to use it to solve your problem.7. Optimizing Loops 7. Optimizing LoopsIf you like to check if a number is lower than 10 or greater than zero, pick the second option.It is faster to test if something is equal to zero than to compare two different numbers.In other words, the following is slower when compared to the alternative option shown below:The following is faster when compared to the above for loop. But, this might be harder to read for beginners.Similar to this is case if you are in a situation where you could pick form !=0 and <=n, use the first one it will be faster. For example, when you try to calculate factorial in the separate function.It is better to avoid loop in situations where you have few functions called with different arguments that are ranging from 1 to 5, it is better to use linear calls with five calls.If you are in the situation to use: one loop and few tasks or few loops with one task in each loop. Pick the first option. It is a trick that could generate faster code. I am not sure, but compiler probably could not optimize this still.8. Data Structure Optimization 8. Data Structure Optimization9. Binary Search or Sequential Search 9. Binary Search or Sequential SearchShould we use binary search or sequential search to solve a problem?One of the common tasks we need to do when we program is to search for some value in some data structure. Yes, it is basis for a hash tables, multi-level hash tables, etc.10. Optimizing Arrays 10. Optimizing ArraysThe array is one of the most basic data structures that occupy some space in memory for its elements.

password reset

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stackoverflow.com

https://stackoverflow.com/questions/3299951/how-to-pass-password-automatically-for-rsync-ssh-command

Jul 20, 2010 . sudo rsync -avi --delete /media/sdb1/backups/www/ [email protected]:/var/www/ If you are still getting prompted for a password, then you need to check your ssh configuration in /etc/ssh/sshd_config and verify that the users in source and target each have the others' respective public ssh key by sending each over with ssh-copy-id [email protected]. Reviews: 2

Reviews: 2

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techjunkie.com

https://www.techjunkie.com/rsync-without-password/

Jun 07, 2019 . Enter the following command: ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.188.15. You will then be prompted to enter the password on your remote host, and you will have to copy the public key to the right location. Now, when everything …

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stackexchange.com

https://unix.stackexchange.com/questions/111526/how-can-i-rsync-without-prompt-for-password-without-using-public-key-authentica

sshpass -p "password" rsync [email protected]:/abc /def Note the space at the start of the command, in the bash shell this will stop the command (and the password) from being stored in the history. I don't recommend using the RSYNC_PASSWORD variable unless absolutely necessary (as per a previous edit to this answer), I recommend suppressing history storage or … Reviews: 2

Reviews: 2

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serverfault.com

https://serverfault.com/questions/127209/username-and-password-for-rsync-in-script

I read the manual and it says: RSYNC_PASSWORD Setting RSYNC_PASSWORD to the required Stack Exchange Network Stack Exchange network consists of 178 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Reviews: 4

Reviews: 4

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bonhardcomputing.com

http://bonhardcomputing.com/rsync-server/

Features. – Share any folder. – Connect to the shared folder using the native rsync protocol. – Secure access with a username and password. – Specify a custom port number. – Includes rsync 3.1.3. Download now and try for free, or jump to system requirements.

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samba.org

https://rsync.samba.org/documentation.html

documentation. An html version of the rsync man page.; An html version of the rsync-ssl man page. An html version of the rsyncd.conf man page. The FAQ (frequently asked questions list).; A nice tutorial on setting up ssh to avoid password prompts also covers how you can restrict the commands allowed and setup a cron job to run rsync.; Karsten Thygesen has written a doc on …

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github.com

https://gist.github.com/jyap808/8700714

spaghetti% ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/kattoo/.ssh/id_rsa): testRsync Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in testRsync. Your public key has been saved in testRsync.pub. password reset

password reset

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atlantic.net

https://www.atlantic.net/vps-hosting/how-to-setup-rsync-daemon-linux-server/

Sep 28, 2015 . – A Linux server with rsync installed – if you do not have a server already, why not spin up a robust and reliable VPS Server in under 30 seconds. – (Optional) Xinetd installed. – Appropriate permissions to read and/or write on the rsync daemon (this tutorial will show commands run as the root user). password reset

password reset

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linuxconfig.org

https://linuxconfig.org/how-to-setup-the-rsync-daemon-on-linux

May 29, 2020 . In a previous article we saw some basic examples of how to use rsync on Linux to transfer data efficiently. As we saw, to synchronize data with a remote machine we can use both a remote shell as ssh or the rsync daemon.In this article we will focus on the latter option, and we will see how to install and configure rsyncd on some of the most used Linux distributions. password reset

password reset

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freecodecamp.org

https://www.freecodecamp.org/news/rsync-examples-rsync-options-and-how-to-copy-files-over-ssh/

Rsync is faster than tools like Secure Copy Protocol (SCP). It uses the delta-transferalgorithm that minimizes the data transfer by copying only the sections of a file that have been updated. Some of the additional features of Rsync include: 1. Supports copying links, devices, owners, groups, and permissions 2. Does not require super-user privileges 3. Pipelines file transfers to minimize lat… password reset

Rsync is faster than tools like Secure Copy Protocol (SCP). It uses the delta-transferalgorithm that minimizes the data transfer by copying only the sections of a file that have been updated. Some of the additional features of Rsync include: 1. Supports copying links, devices, owners, groups, and permissions 2. Does not require super-user privileges 3. Pipelines file transfers to minimize lat…

password reset

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antdecor.us

https://loadingart.antdecor.us/rsync-server-basic-edition/

Dec 17, 2021 . 小巧便捷，使用方便，让你的工作更加有效率 Rsync Server Basic Edition 2018.08.12 破解版 – Rsync服务器 - Digit77.com 海量精品Mac应用免费分享. 5 popular rsync backup scenarios; Cloud backup from IONOS. Make costly downtime a thing of the past and back up your business the easy way! password reset

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macupdate.com

https://www.macupdate.com/app/mac/59726/rsync-server-basic-edition

Jan 12, 2019 . Try our new feature and write a detailed review about Rsync Server - Basic Edition. All reviews will be posted soon. Write review. Write your thoughts in our old-fashioned comment. MacUpdate Comment Policy. We strongly recommend leaving comments, however comments with abusive words, bullying, personal attacks of any type will be moderated. password reset

password reset

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ruanyifeng.com

https://www.ruanyifeng.com/blog/2020/08/rsync.html

rsync 是一个常用的 Linux 应用程序，用于文件同步。 它可以在本地计算机与远程计算机之间，或者两个本地目录之间同步文件（但不支持两台远程计算机之间的同步）。它也可以当作文件复制工具，替代cp和mv命令。 它名称里面的r指的是 remote，rsync 其实就是"远程同步"（remote sync）的意思。与其他文件传输工具（如 FTP 或 scp）不同，rsync 的最大特点是会检查发送 … password reset

rsync 是一个常用的 Linux 应用程序，用于文件同步。 它可以在本地计算机与远程计算机之间，或者两个本地目录之间同步文件（但不支持两台远程计算机之间的同步）。它也可以当作文件复制工具，替代cp和mv命令。 它名称里面的r指的是 remote，rsync 其实就是"远程同步"（remote sync）的意思。与其他文件传输工具（如 FTP 或 scp）不同，rsync 的最大特点是会检查发送 …

password reset

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itefix.net

https://www.itefix.net/content/password-file-not-working

Apr 28, 2006 . rsync --password-file (= )cygdrive/c/progra~1/cwRsync/.ssh/rsync.passwd -av /cygdrive/c/doc/ [email protected]. (link sends e-mail) :/home/xxx/test/. on the remote side there is an rsyncd.conf file that contains the following, with the ip address changed to # and the user name to xxx: =============================.

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phoenixnap.com

https://phoenixnap.com/kb/rsync-command-linux-examples

Mar 23, 2020 . Rsync, or Remote Sync, is a free command-line tool that lets you transfer files and directories to local and remote destinations. Rsync is used for mirroring, performing backups, or migrating data to other servers. This tool is fast and efficient, copying only the changes from the source and offering customization options. password reset

password reset

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apple.com

https://apps.apple.com/us/app/rsync-server-basic-edition/id1255146085?mt=12

‎Read reviews, compare customer ratings, see screenshots, and learn more about Rsync Server - Basic Edition. Download Rsync Server - Basic Edition … password reset

password reset

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linuxquestions.org

https://www.linuxquestions.org/questions/slackware-14/rsync-password-file-not-working-212247/

Aug 02, 2004 . Rep: You have to copy your ssh public key on Debian like : On slackware : ssh-keygen -t rsa. -- type enter (default) after each question even for password, press enter. -- it will generate 2 files : the private key and the public key (id_rsa.pub is your public key) Then copy the public key to debian :

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