batch pipe output to variable

Redirect multiple lines by bracketing a set of commands: The CMD Shell can redirect ASCII/ANSI (the default) or Unicode (UCS-2 le) but not UTF-8. . SO:Assign output of a program to a variable using a MS batch file. . Why did the Soviets not shoot down US spy satellites during the Cold War? How do I measure execution time of a command on the Windows command line? In your case, the loop would go something like this. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. To set a variable to the output of a command, use for /f: for /f "tokens=*" %%a in ('command') do set _CmdResult=%%a The problem is, to use a pipe in the command you need to escape it with the command line escape character: ^, therefore: ^|. Agree Ackermann Function without Recursion or Stack. UNIX is a registered trademark of The Open Group. Triple escape it, ^^^|: I find myself a tad amazed at the lack of what I consider the best answer to this question anywhere on the internet. Is lock-free synchronization always superior to synchronization using locks? If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? @Erwann It's a compound command. Batch files - Redirection Redirection Redirection usually results in temporary files . Any newline (CR/LF) characters in the first command will be turned into & operators. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. For an overview of redirection and piping, view my original redirection page. So I was planning to loop and check the status continuously until the status is STOPPED. stdout: file descriptor 1, stdout stands for standard output and means printing to the terminal normal messages, or text. By the way, with testing, 1 corresponds to STOPPED for me. Copy the following code into Notepad and save it as "test.bat": Run test.bat in CMD.EXE, and this is what you'll get: Now let's see if we can separate the streams again. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. Can the Spiritual Weapon spell be used as cover? In Win10, looking for way to pipe the output from a DIR command at the Command Prompt or in a Batch File to serve as input to the CERTUTIL command. O tells it to output somewhere, . It seems odd that in Windows and DOS that more seems one of only a few commands that can have input piped to it. Bash: Assign output of pipe to a variable Ask Question Asked 6 years, 1 month ago Modified 4 months ago Viewed 209k times 96 I am trying to get the output of a pipe into a variable. Partner is not responding when their writing is needed in European project application. Besides being used for redirection to the NUL device, with CTTYCOM1 the control could be passed on to a terminal on serial port COM1. The same result you got with ECHOHelloworld without the redirection. The following example sends the list of all running tasks using the tasklist command and sends the output to the find command. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Use redirection (">") to send the command "TIME /T" everytime to OVERWRITE a temp-file in the %TEMP% DIRECTORY : Thanks for the above solution I always have this problem for a long time. Why does Jesus turn to the Father to forgive in Luke 23:34? A workaround that may look a bit intimidating is grouping the command line and escaping the redirection: What this does is turn the part between parentheses into a "literal" (uninterpreted) string that is passed to the command interpreter of the newly started process, which then in turn does interpret it. A CMD error is an error raised by the command processor itself rather than the program/command. Even if there isn't, thanks anyway. : 199.99.9.1 But now I need to somehow extract only the IP address out of this text line and then assign it to an environment variable. or By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. This however does not work in interactive shells as lastpipe requires that job control is not active. rev2023.3.1.43269. CMD Syntax The find command will then find all processes which are of the type notepad and display them in the command prompt. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Would the reflected sun's radiation melt ice in LEO? Windows 98 question From boot to sleep. By definition Console isn't a stream. It says I dont want to spawn a subshell because the command before the pipe needs to edit global variables, which it cant do in a subshell. Your (misnamed!) To set a variable to the output of a command, use for /f: The problem is, to use a pipe in the command you need to escape it with the command line escape character: ^, therefore: ^|. In this case, we could also have used test.bat>NUL2>NUL Of course, depending on what your sc query outputs, yours may be slightly different, so follow how I got there and modify as needed. . Browse other questions tagged. Yes that's correct! Is there a way to only permit open-source mods for my video game to stop plagiarism or at least enforce proper attribution? Linux is a registered trademark of Linus Torvalds. Those of you familiar with one of the Unix/Linux shells probably know what these streams are: Standard Output is the stream where all, well, standard output of commands is being sent to. I need to store the output of a command line in a variable. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Its more like: And I dont get, why that doesnt work. At what point of what we watch as the MCU movies the branching started? Does With(NoLock) help with query performance? We have already Short-formatted our System-Time to HHmm, (which is 2245 for 10:45PM) Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. I'd rather it look like filename.mp3. IOW, I want to get the MD5 hash for all of the files matched by a DIR command. For example, the following command searches every directory on drive C:, finds the file names that include the string "Log", and then displays them in one Command Prompt window at a time . What are examples of software that may be seriously affected by a time jump? batch file - Set output of a command as a variable (with pipes) - Stack Overflow Set output of a command as a variable (with pipes) [duplicate] Ask Question Asked 10 years ago Modified 2 years, 4 months ago Viewed 206k times 61 This question already has answers here : Assign output of a program to a variable using a MS batch file (12 answers) But this would be helpful for future reference. To display a text on screen we have the ECHO command: This will show the following text on screen: When I say "on screen", I'm actually referring to the "DOS Prompt", "console" or "command window", or whatever other "alias" is used. How can I recognize one? Or more exactly, it is exactly a, @Parckwart yes. You must log in or register to reply here. Why does the ping command in my batch file execute in a loop and navigates to the beginning? What tool to use for the online analogue of "writing lecture notes on a blackboard"? I know you can do it fairly easily with the FOR command, but I think it would look "nicer" with a pipe. It will then take this output and print it to the file AllText.txt. Thank you Stephan. There is another stream, Standard Input: many commands accept input at their Standard Input instead of directly from the keyboard. It only takes a minute to sign up. In my case I'm encoding some JSON data and providing that to curl so I'm going to share just the basic idea because it is already encoded if you use the right type. For example, if I'd like to read the output of the "ver" command (which tells you what version of window) to a variable called "myvar", how would I do it? For example. I can't see any further benefit of your answer? The result may differ for different operating system versions, but in Windows XP I get the following error message: This is a fine demonstration of only Standard Output being redirected to the NUL device, but Standard Error still being displayed. but since the subshell's environment is separate (and gone): One solution for you would be to switch to ksh93 which is smarter about this: Another solution for bash would be to set the lastpipe shell option. Very interesting. TYPE test.txt | FIND "Smith", TYPE test.txt | cmd.exe /S /D /C FIND "Smith", This has a couple of side effects: Since version 3.4.0, fish also supports set var "$(cmd)" which behaves like in Korn-like shells (removes all trailing newline characters). I struggled for many years to find the answer. Cannot get batch macro to work (cmd.exe)? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Powershell You need to pass the concatenated string as a single argument to the -DisplayName parameter. What's the difference between a power rail and a signal line? it's just that. This means that '>' alone will not redirect error messages. The ECHO command sends all its output to Standard Output. Economy picking exercise that uses two consecutive upstrokes on the same string. :), @Dai It's a bit much to explain in comments, but the, Redirect pipe to a variable in Windows batch file, CMD/Bash Script Ninja - cURL Response Header Number Manipulation, The open-source game engine youve been waiting for: Godot (Ep. With the NUL device that's no problem, but when redirecting to a file one of the redirections will lock the file for the other redirection. Learn more about Stack Overflow the company, and our products. That's because >NUL redirects all Standard Output to the NUL device, which does nothing but discard it. However, you can use the read command and then use the assigned variable with echo. If result.txt has more than 1 line, only the top line of the file is used for %DATA%. Thanks for contributing an answer to Unix & Linux Stack Exchange! How can I explain to my manager that a project he wishes to undertake cannot be performed by the team. I am trying to get the output of a pipe into a variable. A batch script that stores optional piped multiline string and optional arguments. rev2023.3.1.43269. Pipe command output to Variable. But it turns out I can if I escape the & sign: Thx for clarification. What does a search warrant actually look like? To prevent all commands in a batch file (including the echo off command) from displaying on the screen, on the first line of the batch file type:. Extracting filenames from svn console output, Limit pipe size and write to temporary file as a fallback. would store the output of the cat in variable var. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Protect your subroutines; make sure there's an unconditional, Ah I see! e.g. It appears I still do not know if it is possible to stream the output from one command to the input of another without a file as an intermediate, apart from the rare except of pipe to more. purposes of this example I tried lo To store the output of a command in a variable, instead of a pipe you can use a for /f command. Now, I'm not sure which version of Windows you're running, but my attempts at a sc query on Windows 7 give the following output: This means a findstr STATE would be required, which gives the output: Now, in the example above, tokens=* means every token is set to the variable %%a, where tokens are separated by spaces. The best answers are voted up and rise to the top, Not the answer you're looking for? Making statements based on opinion; back them up with references or personal experience. The best answers are voted up and rise to the top, Not the answer you're looking for? Pipe command output to Variable. Has Microsoft lowered its Windows 11 eligibility criteria? Usually, avoiding temp files is nice, though. Notes to editors: Please don't change the code. #1 I'm trying to set the output of a commandline program to a variable in a Windows batch file. As always, Thanks a million! That's because the error message was sent to the Standard Error stream, which was in turn redirected to the NUL device by 2>NUL. Any long filenames must be surrounded in "double quotes". Has 90% of ice around Antarctica disappeared in less than a decade? Read my explanation of standard output and standard error streams. To illustrate my story there are some examples you can try for yourself. For example: echo zz > bla.txt set /p VV=<bla.txt echo %VV% Solution 3. When redirecting the output of DIR to a file, you may notice that the output file (if in the same folder) will be listed with a size of 0 bytes. Would the reflected sun's radiation melt ice in LEO? . How did Dominion legally obtain text messages from Fox News hosts? stderr: file descriptor 2, . We'll see how we can use this later. You can't assign a process output directly into a var, you need to parse the output with a For /F loop: By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Store PS command output to variable and Invoke-Command. For example, the below command will first take all the files defined in C:\, then using the pipe command, will find all the files with the .txt extension. Batch File. You could also make result.txt into a variable itself, such as %OUTPUT%. Can the Spiritual Weapon spell be used as cover? The following command does produce a bare list of all the files in the E:\Temp folder: But when I pipe that as shown in the following command, I get an error message: The answer by user1686 at Windows Vista piping dir output into attrib command indicates that some commands (like ATTRIB) don't take file names as input, but I don't think that's relevant here. But not me, no Sr. and that's because in a Makefile rules are slightly different. No sanity checking is performed. Server Fault is a question and answer site for system and network administrators. Can the Spiritual Weapon spell be used as cover? There are already 3 old answers mentioning a tempfile. The script informs you of the results, which means you can: What if the command you want to pipe to some variable contains itself a pipe? In Windows NT4 and later (CMD.EXE) and in OS/2 (also CMD.EXE) Standard Error can be redirected by using 2> instead of >. PTIJ Should we be afraid of Artificial Intelligence? That's the cause why it seems that the variables are not set, but a small example shows that they are set but the result is lost later. The lack of a Linux-like backtick/backquote facility is a major annoyance of the pre-PowerShell world. Windows XP can use something like ping 1.1.1.1 -n 1 -w 5000 > nul. Each command in pipes is executed in subshells too, see, Yes, you can edit variables in a subshell and no, you can't assign the output if a command to a variable without a subshell. Can it? To exit the console search use CTRL-X or CTRL-z. Is there a decent tutorial on the new windows batch stuff (newer than 1990. In this case, you can use either the third token (4) or fourth token (RUNNING). In this variable myVarDate contains the output of command. In zsh just, Bash: Assign output of pipe to a variable. I also noticed that you sometimes need to remove spaces like from the Date /T or Ver commands which return something like "Tue 06/20/2009" or "Microsoft Windows Version [6.0.6001]" into separate variables. The usage of mktemp can refer to How create a temporary file in shell script? Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Launching the CI/CD and R Collectives and community editing features for Windows Batch help in setting a variable from command output, How to set commands output as a variable in a batch file. If you try to use the for /f loop with the where command, instead of dir /b (it does not result in the full file path), this will result in the full file path and you can use the output loop variable in Certutil: If you only need the MD5 strings in output, add |find/v ":": You also can do it more simple and recursively using For / r, same used in like linked question: [] Base64 Encode or Decode (MacOS/Windows/Linux). Edit: I dont want to spawn a subshell because the command before the pipe needs to edit global variables, which it cant do in a subshell. Here is another example I wrote using FOR statements that will not require you to output anything to a text file first. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, how i can read n first bit command output in windows batch file? @Echo Off For example, this syntax works, but would fail if the second or subsequent (piped) lines were indented with a space: Does Cast a Spell make you a spellcaster? Learn more. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. @echo off You can use the echo command as part of an if statement. Using command redirection operators. Moving the redirection operator to the front of the line avoids this issue, but is undocumented syntax. and what if later I wold like to pass multiline output from variable to another command? Thanks for contributing an answer to Stack Overflow! Unfortunately, it can be done only in the old MS-DOS versions that came with a CTTY command. In a batch file I usually create a file in the temp directory and If you want to make a variable available to future jobs, you must mark it as an output variable by using isOutput=true. By using this website, you agree with our Cookies Policy. Redirecting Standard Error in "true" MS-DOS (COMMAND.COM) isn't possible (actually it is, by using the CTTY command, but that would redirect all output including Console, and input, including keyboard). Powered by Invision Community. The more command will then display the lists of running tasks one page at a time. You could just use the read command and Command Grouping with curley braces: echo foo | { read myvar; echo $myvar; } except you want to use "global variables", which I think you mean "shell variables" (declare -p to list, or set | grep myvar or set -o posix; set). The problem is that the pipe operator starts two separate cmd instances: one running the left part (echo) of the pipe and another running the right part (set /p). By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How do I let the user set the output directory for files? (1)Im giving you a +1 for posting the best answer. Variable Assignment The SET command assigns a value to a variable. In Win10, looking for way to pipe the output from a DIR command at the Command Prompt or in a Batch File to serve as input to the CERTUTIL command. This is what's known as an, @Parckwart no, all commands in a pipeline are executed in subshells. This problem is described with detail here: So, there is no way around the limitations without a temp file or the "for" command? I don't understand what you're trying to do since none of your examples are correct syntax. Thanks spike, that is genius. (Contd) (2)@roaima is right: you should double-quote all your variables (e.g.. As far as I can tell, youre just repeating what others have said. If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? The command interpreter first creates the empty destination file, then runs the DIR command and finally saves the redirected text into the file. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. And if the Tempfile is ever deleted, it will be re-created as necessary. Find centralized, trusted content and collaborate around the technologies you use most. The best answers are voted up and rise to the top, Not the answer you're looking for? (it seems, because the command line is interactive by default): With those shell options, chaining works read works echo foo | read myvar; echo $myvar" bar" | read myvar2; echo $myvar2, to produce foo bar.

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