Is there any way to specify the value for the "-v" action of the "ed" command via stdin?
I imagined it should've worked like this (Windows):
type "FileWithValue.txt"|xml ed -u /root/ElementToBeUpdated -v - "FileToBeEdited.xml"
With my version of XMLStarlet the result of running the above would set the value of "ElementToBeUpdated" to "-" and I would want for that value to be set to the content of the file "FileWithValue.txt".
If it would be possible to specify that value via stdin, I think 2 problems could be solved:
1. Much safer to set complex/computed/injected values that otherwise could break/change what is intended to be executed by the shell
2. Would allow specifying multi-line values. AFAIK, currently there is no way to specify multi-line values.
Regards,
Bogdan
P.S: Result of running "xml.exe -version" for me:
1.2.1
compiled against libxml2 2.7.8, linked with 20708
compiled against libxslt 1.1.26, linked with 10126
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AFAIK, currently there is no way to specify multi-line values.
That's only true in a crippled shell like cmd.exe:
bash$ xml ed -u /root/ElementToBeUpdated -v one$'\n'two FileToBeEdited.xml
PowerShell> xml ed -u /root/ElementToBeUpdated -v one`ntwo FileToBeEdited.xml
And if you want to get the value from a file:
bash$ xml ed -u /root/ElementToBeUpdated -v "$(cat FileWithValue.txt)" FileToBeEdited.xml
I'm sure that's possible in PowerShell too.
I have been thinking about adding an XPath function to execute a
process, that way you could pass different arguments based on the node
value/attributes:
xml ed -u /elem -x "xstar:exec('SomeCommand', '--option', @AttributeValueHasArgument)" file.xml
A readfile function could be useful that way too:
xml ed -u /elem -x "xstar:readfile(@AttributeValueHasFilename)" file.xml
Another idea was to use a process as a filter, for example to upcase
the value of all elements called "elem":
I mean no offense and I appreciate your reply but I think it's more a hack than a definitive solution to the problem.
The optimal way to specify a mult-iline value would be via a file that I should be able to reference somehow by name on XmlStarlet's command line. Expanding the whole file's content on the command line is not practical for large files and it can easily lead to the shell executing things you didn't mean.
/Bogdan
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An example from CURL's man: The -d switch allows you to specify some data for an HTTP request issued with CURL. The data can be specified inline or via a file.
-d/-data <data>
(HTTP) Sends the specified data in a POST request to the HTTP
server, in the same way that a browser does when a user has
filled in an HTML form and presses the submit button. This will
cause curl to pass the data to the server using the content-type
application/x-www-form-urlencoded. Compare to -F/-form.
-d/-data is the same as -data-ascii. To post data purely
binary, you should instead use the -data-binary option. To URL-
encode the value of a form field you may use -data-urlencode.
If any of these options is used more than once on the same com-
mand line, the data pieces specified will be merged together
with a separating &-symbol. Thus, using '-d name=daniel -d
skill=lousy' would generate a post chunk that looks like
'name=daniel&skill=lousy'.
If you start the data with the letter @, the rest should be a
file name to read the data from, or - if you want curl to read
the data from stdin. The contents of the file must already be
URL-encoded. Multiple files can also be specified. Posting data
from a file named 'foobar' would thus be done with -data @foo-
bar.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
The optimal way to specify a mult-iline value would be via a file that I should be able to reference somehow by name on XmlStarlet's command line. Expanding the whole file's content on the command line is not practical for large files and it can easily lead to the shell executing things you didn't mean.
Yes, I think you are right about this. Currently I'm leaning towards having readfile as an XPath function, that seems like the most flexible way of doing it.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hi,
Is there any way to specify the value for the "-v" action of the "ed" command via stdin?
I imagined it should've worked like this (Windows):
With my version of XMLStarlet the result of running the above would set the value of "ElementToBeUpdated" to "-" and I would want for that value to be set to the content of the file "FileWithValue.txt".
If it would be possible to specify that value via stdin, I think 2 problems could be solved:
1. Much safer to set complex/computed/injected values that otherwise could break/change what is intended to be executed by the shell
2. Would allow specifying multi-line values. AFAIK, currently there is no way to specify multi-line values.
Regards,
Bogdan
P.S: Result of running "xml.exe -version" for me:
1.2.1
compiled against libxml2 2.7.8, linked with 20708
compiled against libxslt 1.1.26, linked with 10126
That's only true in a crippled shell like cmd.exe:
And if you want to get the value from a file:
I'm sure that's possible in PowerShell too.
I have been thinking about adding an XPath function to execute a
process, that way you could pass different arguments based on the node
value/attributes:
xml ed -u /elem -x "xstar:exec('SomeCommand', '--option', @AttributeValueHasArgument)" file.xmlA readfile function could be useful that way too:
Another idea was to use a process as a filter, for example to upcase
the value of all elements called "elem":
Thanks for the reply, I understand the solution. Unfortunately, it doesn't work with cmd and I don't really know why as I found an ugly hack to embed a #13#10 on the command line ( see the last comment, by Jiriki, on this page: http://www.computing.net/answers/programming/insert-carriage-return-w-batch/13548.html )
I mean no offense and I appreciate your reply but I think it's more a hack than a definitive solution to the problem.
The optimal way to specify a mult-iline value would be via a file that I should be able to reference somehow by name on XmlStarlet's command line. Expanding the whole file's content on the command line is not practical for large files and it can easily lead to the shell executing things you didn't mean.
/Bogdan
An example from CURL's man: The -d switch allows you to specify some data for an HTTP request issued with CURL. The data can be specified inline or via a file.
-d/-data <data>
(HTTP) Sends the specified data in a POST request to the HTTP
server, in the same way that a browser does when a user has
filled in an HTML form and presses the submit button. This will
cause curl to pass the data to the server using the content-type
application/x-www-form-urlencoded. Compare to -F/-form.
-d/-data is the same as -data-ascii. To post data purely
binary, you should instead use the -data-binary option. To URL-
encode the value of a form field you may use -data-urlencode.
If any of these options is used more than once on the same com-
mand line, the data pieces specified will be merged together
with a separating &-symbol. Thus, using '-d name=daniel -d
skill=lousy' would generate a post chunk that looks like
'name=daniel&skill=lousy'.
If you start the data with the letter @, the rest should be a
file name to read the data from, or - if you want curl to read
the data from stdin. The contents of the file must already be
URL-encoded. Multiple files can also be specified. Posting data
from a file named 'foobar' would thus be done with -data @foo-
bar.
Yes, I think you are right about this. Currently I'm leaning towards having readfile as an XPath function, that seems like the most flexible way of doing it.