I am using sed to parse an xml file from yahoo.finance. the file contains a bunch of uninteresting information and all global stock symbols which i want to extract. It's a 1 liner xml file with a big amount of stock symbols which are represented like that:
symbol="VALUE"
i am using sed like this:
sed "s/.* symbol=\"\(.*\)\".*/\1/" list_stocksymbols.xml >> ./tmpfile.txt
my output looks like that:
<?xml version="1.0" encoding="UTF-8"?>
WRG.AX
<!-- engine8.yql.bf1.yahoo.com -->
problem
as you can see only 1 symbol is extracted (WRG.AX).
question
how would i go about getting sed to write out all symbols?
i tried
sed "s/.* symbol=\"\(.*\)\".*/\1/g" list_stocksymbols.xml >> ./tmpfile.txt
global flag, but it didnt work :/
**xml file extract **
<?xml version="1.0" encoding="UTF-8"?>
<query xmlns:yahoo="http://www.yahooapis.com/v1/base.rng" yahoo:count="215" yahoo:created="2014-08-22T09:05:59Z" yahoo:lang="en-US">
<results><industry id="112" name="Agricultural Chemicals">
<company name="Adarsh Plant Protect Ltd" symbol="ADARSHPL.BO"/>
<company name="Agrium Inc" symbol="AGU.DE"/><company name="Agrium Inc" symbol="AGU.TO"/>
<company name="Agrium Inc." symbol="AGU"/>
<company name="Aimco Pesticides Ltd" symbol="AIMCO.BO"/>
<company name="American Vanguard Corp." symbol="AVD"/>
... and so on. The file is in 1 line only and not formatted like above.
** perl regex try **
perl -nle'print $& if m{(?<=symbol=")[^"]+}' list_stocksymbols
did also just bring out the first occurence
grep -Eo 'symbol="[^"]+' yahoo.txt | cut -c 9-
This works for all the grep versions without Perl support (as in Mac OS X in your case).
Also using only sed you could:
sed 's/.*symbol=\"//;s/\".*//' yahoo.txt
Related
I am currently trying to merge several xml files via the following code:
rex_xh="-e '/^ *<\?xml[^>]*>$/d' -e s/^ *<\?xml[^>]+>//'"
rex_el="-e '/^[[:space:]]*$/d'"
rex_ts="-e "'s/^[ \t]*//'
while read xmldat ; do
cat $xmldat | sed $rex_xh $rex_el $rex_ts >> "$OUTDIR/$OUTFILE" ;
done << "$files"
which should essentially be executed (for each file) as:
cat $xmldat | sed -e '/^ *<\?xml[^>]*>$/d' -e s/^ *<\?xml[^>]+>//' -e '/^[[:space:]]*$/d' -e "'s/^[ \t]*// >> "$OUTDIR/$OUTFILE"
However when trying to execute this, i get this error message:
sed: -e expression #1, char 1: unknown command: `'
If I execute the command without the variables and instead enter the sed commands directly, it works fine. What am i missing? Am I doing something wrong with the variable expansion?
Based on (later given) user input, all 3, only 2 or only 1 of the given regular expressions should be used on the file(s).
The current setup should
-remove xml headers
-remove empty lines
-remove tabs and spaces in the beginning of new lines.
Input Example
<?xml version="1.0" encoding="ISO-8859-15" standalone="no"?>
<RootNode xmlns="http://stub/example">
<ExampleBase someattr="val">
<InnerNode>Example</InnerNode>
<ExampleBase someattr="val">
</RootNode>
Expected result (when header removal, space removal and empty line removal is wanted)
<RootNode xmlns="http://stub/example">
<ExampleBase someattr="val">
<InnerNode>Example</InnerNode>
<ExampleBase someattr="val">
</RootNode>
Expected result (when only space removal and empty line removal is wanted)
<?xml version="1.0" encoding="ISO-8859-15" standalone="no"?>
<RootNode xmlns="http://stub/example">
<ExampleBase someattr="val">
<InnerNode>Example</InnerNode>
<ExampleBase someattr="val">
</RootNode>
Input Example 2
<?xml version="1.0" encoding="ISO-8859-15" standalone="no"?><RootNode xmlns="http://stub/example"><ExampleBase someattr="val"><InnerNode>Example
</InnerNode>
<ExampleBase someattr="val">
</RootNode>
(And yes, we get that kind of weird formatted xml)
Expected result (when header removal, space removal and empty line removal is wanted)
<RootNode xmlns="http://stub/example"><ExampleBase someattr="val"><InnerNode>Example
</InnerNode>
<ExampleBase someattr="val">
</RootNode>
Notes:
The files are not always valid xml files, hence I cant use xmllint or other xml tools
e.g. no closing tag
The header dows not always is alone on the first line, sometimes it is not succeeded by a line break.
The different regexes (e.g rex_xh) will later be optional and controlled by user input, hence the "necessity" to wrap them in variables
In the future it should be easy, to add new "options", hence another reason for using the "options" in variables.
Can anyone help me out here?
Please try following awk code to deal with few edge cases added by OP into the question now. Written and tested with shown samples only in GNU awk.
awk -v RS="^$" '
match($0,/^<\?xml version="[^"]*" encoding="[^"]*" standalone="[^"]*"\?>/){
val=substr($0,RSTART+RLENGTH)
gsub(/\n/,"",val)
gsub(/>[[:space:]]*</,">\n<",val)
gsub(/[[:space:]]+</,"<",val)
gsub(/>[[:space:]]*</,">\n<",val)
print val
}
' Input_file
Explanation: Simple explanation would be, using 2 conditions in awk program. 1st: If a line is NOT having value(matching by regex ^<\?xml version="[^"]*" encoding="[^"]*" standalone="[^"]*"\?>$) AND its NOT NULL, then using gsub function(s) to get output as per need and print that line's value present in val variable..
EDIT by OP - Implemented Solution
After fiddling around and due to the help,comments and answer from #RavinderSingh13 The following code is the final solution(snippet for the important part):
rm_xmlhead=1; # Option given via user input (later)
rm_tabspac=1; # Option given via user input (later)
rm_emptyln=1; # Option given via user input (later)
while read xmldat ; do
cat $xmldat | awk -v rem_xh=$rm_xmlhead -v rem_ts=$rm_tabspac -v rem_el=$rm_emptyln ' {
if(rem_xh) { sub(/^ *<\?xml[^>]+>/,"") }
if(rem_ts) { sub(/^[[:space:]]+/,"") }
if(rem_el && $0 =="" ) {next}
print
}' >> "$OUTPUT" ;
done << "$files"
This removes empty lines, leading spaces and tabs, xml headers and is easily expandable if any "new" requirements arise...also it gives me the possibility to later make each of the removals optional.
Following up on an answer by #dawg to my question how to delete multiple sections in a file based on known patterns, I want to use a regular expression in awk to identify the start of the section(s) I want to delete.
The file I am working with is an xml file. It is in fact the file containing the recently used filenames list (RUFL) in Linux Mint (~/.local/share/recently-used.xbel).
This is how the RUFL is structured:
<?xml version="1.0" encoding="UTF-8"?>
<xbel version="1.0"
xmlns:bookmark="http://www.freedesktop.org/standards/desktop-bookmarks"
xmlns:mime="http://www.freedesktop.org/standards/shared-mime-info"
>
<bookmark href="file:///home/ocor61/Documents/Linux/Linux%20Mint%20Cinnamon%20Keyboard%20Shortcuts.pdf" added="2021-07-18T01:57:02Z" modified="2021-07-18T01:57:02Z" visited="1969-12-31T23:59:59Z">
<info>
<metadata owner="http://freedesktop.org">
<mime:mime-type type="application/pdf"/>
<bookmark:applications>
<bookmark:application name="Document Viewer" exec="'xreader %u'" modified="2021-07-18T01:57:02Z" count="1"/>
</bookmark:applications>
</metadata>
</info>
</bookmark>
<bookmark href="file:///home/ocor61/Documents/Linux/Linux%20Command%20Line%20Cheat%20Sheet.pdf" added="2021-07-18T01:57:09Z" modified="2021-07-18T01:57:09Z" visited="1969-12-31T23:59:59Z">
<info>
<metadata owner="http://freedesktop.org">
<mime:mime-type type="application/pdf"/>
<bookmark:applications>
<bookmark:application name="Document Viewer" exec="'xreader %u'" modified="2021-07-18T01:57:09Z" count="1"/>
</bookmark:applications>
</metadata>
</info>
</bookmark>
<bookmark href="file:///home/ocor61/Documents/work.bfproject" added="2021-07-20T10:52:59Z" modified="2021-07-22T08:41:57Z" visited="1969-12-31T23:59:59Z">
<info>
<metadata owner="http://freedesktop.org">
<mime:mime-type type="application/x-bluefish-project"/>
<bookmark:applications>
<bookmark:application name="bluefish" exec="'bluefish %u'" modified="2021-07-22T08:41:57Z" count="2"/>
</bookmark:applications>
</metadata>
</info>
</bookmark>
</xbel>
I am working on a script to remove filenames from the list. It works fine, but I am also working with an array that contains patterns that should not be used. For example: if the pattern [bookmark] would be used to identify a section that must be removed, the entire file would become unusable. That goes for parts of [bookmark], but also for href, added, info... You get my drift.
So, I want to work with a regexp to counter the problems of entering patterns that cannot be used.
Currently, this is the awk code I am using now (thanks to #dawg):
ENDLINE='</bookmark>'
awk -v f=1 -v st="$1" -v end="$ENDLINE" '
match($0, st) {f=0}
f
match($0, end){f=1}' ~/.local/share/recently-used.xbel
$1 would be the pattern a user enters at the command line, which is part of the file name that must be removed from the RUFL.
The following is the code I would like to use, including the regexp, which doesn't work:
STARTLINE='/(<bookmark href)(.*)($1)(.*)(>)/'
ENDLINE='</bookmark>'
awk -v f=1 -v st="$STARTLINE" -v end="$ENDLINE" '
match($0, st) {f=0}
f
match($0, end){f=1}' ~/.local/share/recently-used.xbel
I have tested the regular expression at https://regexr.com/, so I know it is correct. However, when I use it in my script, this is the error message I am getting:
./ruffle.sh: line 99: syntax error near unexpected token `$0,'
./ruffle.sh: line 99: ` match($0, st) {f=0}'
I have also tried to enter the regexp itself in the awk command line instead of the variable, but that has the same result.
I don't know how to proceed, so any help is appreciated.
The answer to my question lies in how regular expressions can differ when used in different environments. The website I used to check my regexp does so for languages like JS, but not for Bash or likely other shell implementations.
With shellcheck.net as well as by putting the command 'set -vx' in my script right before the awk command, I managed to work things out.
Another mistake I made was to attempt to catch the complete line in the regexp, while I need only the part in that line that can hold the pattern that is entered (which is the part between 'file:' and 'added' in the file ~/.local/share/recently-used.xbel).
The regexp that ultimately works for me now with the variable STARTLINE is:
STARTLINE='file:.*'$1'.*added='
I will have to look into using an xml parser, thanks for the suggestion! For now, however, my script works. Thanks #Sundeep and #EdMorton!
I have the below response being returned from my build system. The build generates multiple artifacts and I want to extract the link to particular artifact from the response below. Let us say something.exe.
<Artifacts>
<artifact name="artifact1" version="1.0" buildId="13321123" make_target="beta" branch="branchName" date="2017-04-21 00:31:38.74856-07"
endtime="2017-04-21 00:59:54.680601-07"
status="succeeded"
change="e850b01967222464ffca02bf94dc711236fa978a"
released="no">
<file url="http://build.system.org/path/to/artifact/folder/MD5SUM.txt"/><file url="http://build.system.org/path/to/artifact/folder/SHA1SUM.txt"/><file url="http://build.system.org/path/to/artifact/folder/SHA256SUM.txt"/><file url="http://build.system.org/path/to/artifact/folder/something.exe"/><file url="http://build.system.org/path/to/artifact/folder/something_x64.msi"/>
</artifact>
</Artifacts>
I would like to know a way to extract just the URL for something.exe. I have tried using piping the curl output and run a grep -E with a regular expression but that gives me the entire line instead.
curl -s --request GET http://build.system.org/path/to/artifact/folder/api/?build=13321123 | grep -E 'file url='
curl -s --request GET http://build.system.org/path/to/artifact/folder/api/?build=13321123 | | grep -E 'file url="http\S+OVF10.ova"'
Is there a way to just extract the following ?
http://build.system.org/path/to/artifact/folder/something.exe
The righteous way would be to use XML tools in this case, such as xmlstarlet
But that, of course, requires a valid XML structure. A valid XML structure would look like:
<artifact name="artifact1" version="1.0" buildId="13321123" make_target="beta" branch="branchName" date="2017-04-21 00:31:38.74856-07"
endtime="2017-04-21 00:59:54.680601-07"
status="succeeded"
change="e850b01967222464ffca02bf94dc711236fa978a"
released="no">
<file url="http://build.system.org/path/to/artifact/folder/MD5SUM.txt"/><file url="http://build.system.org/path/to/artifact/folder/SHA1SUM.txt"/><file url="http://build.system.org/path/to/artifact/folder/SHA256SUM.txt"/><file url="http://build.system.org/path/to/artifact/folder/something.exe"/><file url="http://build.system.org/path/to/artifact/folder/something_x64.msi"/>
</artifact>
The command:
xmlstarlet sel -t -v "//artifact/file[contains(#url,'something.exe')]/#url" -n xmlfile
The output:
http://build.system.org/path/to/artifact/folder/something.exe
-v option (or --value-of ) - print value of XPATH expression
The XPATH contains() function returns true if the first argument string contains the second argument string, and otherwise returns false.
As RomanPerekhrest said, use an xml parser for this kind of task. For your example input you could use xmlstarlet like this:
xml sel -t -m 'Artifacts/artifact/file [contains(#url, "something.exe")]' -v #url
Output:
http://build.system.org/path/to/artifact/folder/something.exe
This regex should work: ([\w\d\s]*.exe)"\/> (it searches for a string that consists of (/somename.exe"/> , where someonemae must consist of letters, digits, or basic space signs ("_","-"," ").
$ regex="([\w\d\s]*.exe)"\/>"
$ echo $input | grep -oP "$regex"
Though, as someone mentioned above, you shouldn't use regex to parse xml, use xml parsers.
I wrote a regex code to extract anchor tags from a html file and got this output.
mdlinks.txt
<a href='/aspnet/aspnet_refhtmlcontrols.asp'>ASP.NET Reference</a>
<a href='/aspnet/webpages_ref_classes.asp'>Razor Reference</a>
<a href='/html/html_examples.asp'>HTML Examples</a>
<a href='/css/css_examples.asp'>CSS Examples</a>
<a href='/w3css/w3css_examples.asp'>W3.CSS Examples</a>
JavaScript Examples
HTML DOM Examples
I have to represent the output as
"text to display" using the sed tool.
<a[\s]href=('|")([^>]+)">((?:.(?!\<\/a\>))*.)<\/a>
This is my regex which captures the text and href link.
Here is the sed command i wrote
sed -E "s/\"<a[\s]href=('|\")([^>]+)\">((?:.(?!\<\/a\>))*.)<\/a>\"/\[\2\] \(\1\)/" mdlinks.txt
But this gives me error.
Can some please help me?
This is not a job for regex (or any other string manipulation tool). You need tools able to parse html. An example using xsltproc:
1) install the xsltproc package (if needed)
2) Write this xsl file that describes how to transform the html input: stylesheet.xsl
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version= "1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text" encoding="UTF-8"/>
<xsl:template match="//a">[<xsl:value-of select="text()"/>] (<xsl:value-of select="#href"/>)</xsl:template>
</xsl:stylesheet>
3) Take your original file or your original html content in a variable (let's say "CONTENT"), but not mdlinks.txt (this step is useless and greping links in html content is error-prone and a waste of time (at least 5 hours for you)) and write:
xsltproc --html --novalid stylesheet.xsl <(echo "$CONTENT")
You obtain:
[Google.com] (http://google.com)
[An Example] (http://example.com/files.html)
[File #23] (file23.html)
[See my picture!] (images/mypic.png)
[Email Joel] (mailto:joelross#uw.edu)
Link: http://scott.dd.com.au/wiki/XSLT_Tutorial
Parsing html with line oriented tools will normally fail. Given your simple layout, you could try
tr -s "<" ">" < mdlinks.txt | cut -d">" -f3
I have a file named test.txt with the following content
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<test time="60" id="01">
<java.lang.String value="cat"/><java.lang.String value="dog"/>
<java.lang.String value="mouse"/>
<java.lang.String value="cow"/>
</test>
What I would like to do is that , i want to edit the file so that when i get something like , <java.lang.String value="something"/> i will change that part to <animal>something</animal>
So for previous example , after applying a script with sed/awk/grep command the file content will be changed to or a new file will be created like following:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<test time="60" id="01">
<animal>cat</animal><animal>dog</animal>
<animal>mouse</animal>
<animal>cow</animal>
</test>
I tried to extract that particular part using following command :
$less test.txt | grep -Po 'java.lang.String value="\K[^"]*' | awk -F: '{print "<animal>" $1 "</animal>"}'
The output gives me the changed part, but I want this changed part along with the rest of the file unchanged :
<animal>cat</animal>
<animal>dog</animal>
<animal>mouse</animal>
<animal>cow</animal>
I am new to scripting , I don't know how to write the complete output in a file .
sed -r 's#<java.lang.String value="([^"]*)"/>#<animal>\1</animal>#g' test.txt
And you should not do XML transformations with regular expressions...
EDIT about how it works
By default sed uses "basic regular expressions", where many special characters have to be prefixed with \. -r flag switches to "extended regular expressions" where the syntax is less cumbersome. See OpenGroup for details.
By default sed prints output as-is unless commands modify it. The replacement command is like s#search_regexp#replacement#flags. The delimiter can be anything like /, #, or ,. I choose # so it doesn't clash with the \ character in XML.
Then we match things like <java.lang.String value="anything_except_quotes"/>. The part that we want to reuse has parenthesis, it's called a matching group. In the replacement we refer to the thing we captured inside the matching group by \1.
g flag makes sed replace all occurences of the search pattern, not only the first one.
ok some problems with your command:
less test.txt | grep -Po 'java.lang.String value="\K[^"]*' | awk -F: '{print "<animal>" $1 "</animal>"}'
to begin with, there's a useless use of less, grep can take a file as a parameter:
grep -Po 'java.lang.String value="\K[^"]*' test.txt | awk -F: '{print "<animal>" $1 "</animal>"}'
then you're using grep to select lines that matches a string, so basically, your sequence of commands is explicitely keeping only the lines that have the java.lang... string, taking everything else out... A simpler solution would be to use sed:
sed -r 's,<java.lang.String value="([^"]*)"\s*/>,<animal>\1</animal>,g' test.txt
which uses the substitution syntax of sed to replace the match, while extracting what's in the parenthesis ( and ) as \1 in the right part. The [^"] part is for matching everything that is not a " character, and the * operator is to apply the match 0 or more times. The \s is to match a space, *, 0 or more times.
A regex is an automaton that uses states and transitions to match a given string. Here's a visual of how the regex works:
demo of the regex on an example
Though in your particular case that simple regex works out, keep in mind that this is only a hack. You should instead use an XML parser and replace the nodes to match your needs, using XSLT/XSLFO that are tools designed to transform an XML into another one (or something else).
To do that, you could use a tool such as xsltproc and look at this Q for an example that transforms all foo nodes into bar nodes in an XML tree, here's how to do it:
test.xsl:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes"/>
<xsl:strip-space elements="*"/>
<!--Identity Template. This will copy everything as-is.-->
<xsl:template match="node()|#*">
<xsl:copy>
<xsl:apply-templates select="node()|#*"/>
</xsl:copy>
</xsl:template>
<!--Change "java.lang.String" element to "animal" element.-->
<xsl:template match="java.lang.String">
<animal>
<!-- get the attribute 'value' of java.lang.String -->
<xsl:copy-of select="#*"/>
<xsl:apply-templates/>
</animal>
</xsl:template>
</xsl:stylesheet>
run:
xsltproc test.xsl test.xml
result:
<?xml version="1.0"?>
<test time="60" id="01">
<animal value="cat"/>
<animal value="dog"/>
<animal value="mouse"/>
<animal value="cow"/>
</test>
and by the way, given your XML, it looks like it has been generated by Java, and there's multiple ways to apply that XSL from within your code, even before you need to handle it using command line tools.