To close Notepad, select Exit from the File menu. To close the command window, type exit at the command prompt and press Enter. NOTE: If you use the same filename a second time, that file will be overwritten and any output it previously contained will be lost. To preserve your previous output, use a different filename or you can append the output to the end of an existing file.
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Active1 year, 8 months ago
- If you just want to append the output of an exe into an existing file, you can do something like (also from cmd prompt) whatever.exefile.txt (to create a new file.txt, you would do whatever.exefile.txt) I am not familiar with activewords (or quicksilver, for that matter), so if I am just not getting it, post back with more details.
- You can redirect the command output to a file: yourcommand /path/to/file To append the command output to a file instead of overwriting it, use: yourcommand /path/to/file.
- So I'm trying to run foo.exe, but I don't want the output to the terminal but into a file. Running foo.exe foo.txt should accomplish this for me, but it's not. When I'm running the exe-file, I get the output. The exe is working fine in other words. However, when I try to send the output to a file, the only thing I get is this.
I have a batch file which calls a java program.
The output is redirected to a log file in the same directory.However the log file is replaced everytime the batch file is run...
I would like to keep the old outputs in the log file and always append the new output to the log file.
Yair Nevet10.1k99 gold badges5555 silver badges9696 bronze badges
Monojeet NayakMonojeet Nayak32111 gold badge55 silver badges1313 bronze badges
3 Answers
Instead of using '>' to redirect like this:
use '>>' to append normal 'stdout' output to a new or existing file:
However, if you also want to capture 'stderr' errors (such as why the Java program couldn't be started), you should also use the '2>&1' tag which redirects 'stderr' (the '2') to 'stdout' (the '1'). For example:
Jon SkeetJon Skeet1134k717717 gold badges82068206 silver badges85938593 bronze badges
This is not an answer to your original question: 'Appending output of a Batch file To log file?'
For reference, it's an answer to your followup question: 'What lines should i add to my batch file which will make it execute after every 30mins?'
(But I would take Jon Skeet's advice: 'You probably shouldn't do that in your batch file - instead, use Task Scheduler.')
Timeout:
Example (1 second):
TIMEOUT /T 1000 /NOBREAK
Sleep:
Example (1 second):
sleep -m 1000
Alternative methods:
Here's an answer to your 2nd followup question: 'Along with the Timestamp?'
Example:
echo *** Date: %DATE:/=-% and Time:%TIME::=-% *** >> output.log
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JohnBJohnB12.2k1414 gold badges7878 silver badges9797 bronze badges
Use log4j in your java program instead. Then you can output to multiple media, create rolling logs, etc. and include timestamps, class names and line numbers.
Jon MitchellJon Mitchell
Not the answer you're looking for? Browse other questions tagged batch-file or ask your own question.
Active5 months ago
How do I save the output of a command to a file?
Is there a way without using any software? I would like to know how.
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7 Answers
Yes it is possible, just redirect the output to a file:
Or if you want to append data:
If you want
stderr
as well use this: or this to append:
if you want to have both
stderr
and output displayed on the console and in a file use this:(If you want the output only, drop the
Seth♦2
above)Command Append Output To File
Seth37.7k2828 gold badges121121 silver badges179179 bronze badges
To write the output of a command to a file, there are basically 10 commonly used ways.
Overview:
Please note that the
There is a way, but it's too complicated to fit into the column. You can find a helpful link in the List section about it.
n.e.
in the syntax column means 'not existing'.There is a way, but it's too complicated to fit into the column. You can find a helpful link in the List section about it.
List:
command > output.txt
The standard output stream will be redirected to the file only, it will not be visible in the terminal. If the file already exists, it gets overwritten.command >> output.txt
The standard output stream will be redirected to the file only, it will not be visible in the terminal. If the file already exists, the new data will get appended to the end of the file.command 2> output.txt
The standard error stream will be redirected to the file only, it will not be visible in the terminal. If the file already exists, it gets overwritten.command 2>> output.txt
The standard error stream will be redirected to the file only, it will not be visible in the terminal. If the file already exists, the new data will get appended to the end of the file.command &> output.txt
Both the standard output and standard error stream will be redirected to the file only, nothing will be visible in the terminal. If the file already exists, it gets overwritten.command &>> output.txt
Both the standard output and standard error stream will be redirected to the file only, nothing will be visible in the terminal. If the file already exists, the new data will get appended to the end of the file..command | tee output.txt
The standard output stream will be copied to the file, it will still be visible in the terminal. If the file already exists, it gets overwritten.command | tee -a output.txt
The standard output stream will be copied to the file, it will still be visible in the terminal. If the file already exists, the new data will get appended to the end of the file.- (*)Bash has no shorthand syntax that allows piping only StdErr to a second command, which would be needed here in combination with
tee
again to complete the table. If you really need something like that, please look at 'How to pipe stderr, and not stdout?' on Stack Overflow for some ways how this can be done e.g. by swapping streams or using process substitution. command |& tee output.txt
Both the standard output and standard error streams will be copied to the file while still being visible in the terminal. If the file already exists, it gets overwritten.command |& tee -a output.txt
Both the standard output and standard error streams will be copied to the file while still being visible in the terminal. If the file already exists, the new data will get appended to the end of the file.
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Byte Commander♦Byte Commander72.5k2929 gold badges196196 silver badges331331 bronze badges
You can also use
tee
to send the output to a file:A slight modification will catch stderr as well:
or slightly shorter and less complicated:
tee
is useful if you want to be able to capture command output while also viewing it live.29.3k1313 gold badges6969 silver badges116116 bronze badges
AaronAaron5,79055 gold badges2525 silver badges4343 bronze badges
You can redirect the command output to a file:
To append the command output to a file instead of overwriting it, use:
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chaoschaos20.8k88 gold badges6262 silver badges6969 bronze badges
An enhancement to consider -
Various scripts will inject color codes into the output which you may not want cluttering up your log file.
To fix this, you can use the program sed to strip out those codes. Example:
Sean HuberSean Huber
For
cron
jobs etc you want to avoid the Bash extensions. The equivalent POSIX sh
redirection operators areYou'll notice that the POSIX facility is in some sense simpler and more straightforward. The
tripleeetripleee&>
syntax was borrowed from csh
which should already convince you that it's a bad idea.78422 gold badges99 silver badges1717 bronze badges
some_command | tee command.log
and some_command > command.log
have the issue that they do not save the command output to the command.log
file in real-time. To avoid that issue and save the command output in real-time, you may append
unbuffer
, which comes with the expect
package.Example:
Assuming
log.py
contains:Cmd Append Output To File
you can run
unbuffer python log.py | tee command.log
or unbuffer python log.py > command.log
More information: How can I save a command output to a file in real-time?
Franck DernoncourtCmd Append Output To File Pdf
Franck DernoncourtShell Script Append Command Output To File
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Cmd Append Output To File Format
protected by Community♦Mar 12 '15 at 6:57
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