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Posted to user@commons.apache.org by Thomas Tanneberger <tt...@gmx.net> on 2010/08/13 00:00:38 UTC
[exec] redirect output via command
Hi All,
while I am playing with Apache Common Exec I found out that is it
obviously not possible to redirect output into a file via command. I
want to exec cksum file > file.chsum.txt. I get the output of cksum in
ecplise but it is not written to disk.
<code>
public static String CHKSUM_CMD2 = "cksum \"${FILE_NAME}\" > out.txt";
HashMap<String, String> options = new HashMap<String, String>();
CommandLine commandLine = CommandLine.parse(CHKSUM_CMD2);
options.put("FILE_NAME", fileName);
commandLine.setSubstitutionMap(options);
DefaultExecutor executor = new DefaultExecutor();
executor.setStreamHandler(null);
executor.execute(commandLine);
</code>
I suppose that I have to capture the output and write it to disk
afterwards. Or is there other solution ahead?
Many thx, Thomas
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Re: [exec] redirect output via command
Posted by Siegfried Goeschl <si...@it20one.at>.
Hi Thomas,
success stories are always welcome ... :-)
Cheers,
Siegfried Goeschl
On 23.08.10 22:09, Thomas Tanneberger wrote:
> Hi Siegfried,
>
> many thx for your advise. The solution is quite simple. You can open a
> StreamWriter and write the output directly into. See example below.
>
> <code>
> PumpStreamHandler ps = new PumpStreamHandler(new FileOutputStream(
> "fileName"));
> executor.setStreamHandler(ps);
> executor.execute(commandLine);
> </code>
>
> Thomas
>
> Am Freitag, den 13.08.2010, 11:14 +0200 schrieb Siegfried Goeschl:
>> Hi Thomas,
>>
>> +) redirection such as "> out.txt" is implemented in the command line
>> processor or shell. You would need a batch file to do that (a coule of
>> the regression tests are using that redirection)
>>
>> +) "executor.setStreamHandler(null)" - should give you a NPE. Please
>> comment out the line. Without a stream handler you application will block.
>>
>> +) Another was of getting the output is to use a StreamHandler and pass
>> a FileOutputStream.
>>
>> Cheers,
>>
>> Siegfried Goeschl
>>
>> On 13.08.10 00:00, Thomas Tanneberger wrote:
>>> Hi All,
>>>
>>> while I am playing with Apache Common Exec I found out that is it
>>> obviously not possible to redirect output into a file via command. I
>>> want to exec cksum file> file.chsum.txt. I get the output of cksum in
>>> ecplise but it is not written to disk.
>>>
>>> <code>
>>> public static String CHKSUM_CMD2 = "cksum \"${FILE_NAME}\"> out.txt";
>>> HashMap<String, String> options = new HashMap<String, String>();
>>> CommandLine commandLine = CommandLine.parse(CHKSUM_CMD2);
>>> options.put("FILE_NAME", fileName);
>>> commandLine.setSubstitutionMap(options);
>>> DefaultExecutor executor = new DefaultExecutor();
>>> executor.setStreamHandler(null);
>>> executor.execute(commandLine);
>>> </code>
>>>
>>> I suppose that I have to capture the output and write it to disk
>>> afterwards. Or is there other solution ahead?
>>>
>>> Many thx, Thomas
>>>
>>>
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>>> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
>>> For additional commands, e-mail: user-help@commons.apache.org
>>>
>>>
>>
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>
>
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Re: [exec] redirect output via command
Posted by Siegfried Goeschl <si...@it20one.at>.
Hi Thomas,
+) redirection such as "> out.txt" is implemented in the command line
processor or shell. You would need a batch file to do that (a coule of
the regression tests are using that redirection)
+) "executor.setStreamHandler(null)" - should give you a NPE. Please
comment out the line. Without a stream handler you application will block.
+) Another was of getting the output is to use a StreamHandler and pass
a FileOutputStream.
Cheers,
Siegfried Goeschl
On 13.08.10 00:00, Thomas Tanneberger wrote:
> Hi All,
>
> while I am playing with Apache Common Exec I found out that is it
> obviously not possible to redirect output into a file via command. I
> want to exec cksum file> file.chsum.txt. I get the output of cksum in
> ecplise but it is not written to disk.
>
> <code>
> public static String CHKSUM_CMD2 = "cksum \"${FILE_NAME}\"> out.txt";
> HashMap<String, String> options = new HashMap<String, String>();
> CommandLine commandLine = CommandLine.parse(CHKSUM_CMD2);
> options.put("FILE_NAME", fileName);
> commandLine.setSubstitutionMap(options);
> DefaultExecutor executor = new DefaultExecutor();
> executor.setStreamHandler(null);
> executor.execute(commandLine);
> </code>
>
> I suppose that I have to capture the output and write it to disk
> afterwards. Or is there other solution ahead?
>
> Many thx, Thomas
>
>
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> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
> For additional commands, e-mail: user-help@commons.apache.org
>
>
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