如何使用xmlstartlet选择和编辑xml节点？

Question

在这里，我选择节点：

$ xmlstarlet sel -t -c "/configuration/property[name='http.agent.name']"/value conf/nutch-default.xml 
<value/>

这不会对其进行编辑：

$ xmlstarlet edit  "/configuration/property[name='http.agent.name']"/value -v 'test' conf/nutch-default.xml 
I/O warning : failed to load external entity "/configuration/property[name='http.agent.name']/value"

会更改更改的xmlstartlet命令是什么？xmlstartlet还不支持AFAIK -x。

我正在conf / nutch-default.xml

$ xmlstarlet ed --help
XMLStarlet Toolkit: Edit XML document(s)
Usage: xml ed <global-options> {<action>} [ <xml-file-or-uri> ... ]
where
  <global-options>  - global options for editing
  <xml-file-or-uri> - input XML document file name/uri (stdin otherwise)

<global-options> are:
  -P (or --pf)        - preserve original formatting
  -S (or --ps)        - preserve non-significant spaces
  -O (or --omit-decl) - omit XML declaration (<?xml ...?>)
  -N <name>=<value>   - predefine namespaces (name without 'xmlns:')
                        ex: xsql=urn:oracle-xsql
                        Multiple -N options are allowed.
                        -N options must be last global options.
  --help or -h        - display help

where <action>
  -d or --delete <xpath>
  -i or --insert <xpath> -t (--type) elem|text|attr -n <name> -v (--value) <value>
  -a or --append <xpath> -t (--type) elem|text|attr -n <name> -v (--value) <value>
  -s or --subnode <xpath> -t (--type) elem|text|attr -n <name> -v (--value) <value>
  -m or --move <xpath1> <xpath2>
  -r or --rename <xpath1> -v <new-name>
  -u or --update <xpath> -v (--value) <value>
             -x (--expr) <xpath> (-x is not implemented yet)

XMLStarlet is a command line toolkit to query/edit/check/transform
XML documents (for more information see http://xmlstar.sourceforge.net/)

$ xmlstarlet --version
1.0.1

Answer 1

您可以将nutch-default.xml的全部内容读取为一个变量，使用xmlstarlet编辑该变量的内容，然后将结果再次写回nutch-default.xml。

另一种方法是使用打开文件句柄，如将输出从sed's / c / d /'myFile重定向到myFile中所述。

xmlstarlet --version  # 1.0.6
xmlstarlet ed --help | less -Ip 'inplace'

# 1.
# in-place version using xmlstarlet only
curl -L -s -o nutch-default.xml 'http://svn.apache.org/viewvc/nutch/branches/branch-1.3/conf/nutch-default.xml?view=co&revision=1079746&content-type=text%2Fplain'
xmlstarlet edit -L -u "/configuration/property[name='http.agent.name']"/value -v 'test' nutch-default.xml
xmlstarlet sel -t -c "/configuration/property[name='http.agent.name']"/value nutch-default.xml 


# 2.
# variable version
curl -L -s -o nutch-default.xml 'http://svn.apache.org/viewvc/nutch/branches/branch-1.3/conf/nutch-default.xml?view=co&revision=1079746&content-type=text%2Fplain'
xmlstr="$(< nutch-default.xml)"   # save file contents to variable

printf '%s\n' "$xmlstr" |
xmlstarlet edit -u "/configuration/property[name='http.agent.name']"/value -v 'test' > nutch-default.xml

xmlstarlet sel -t -c "/configuration/property[name='http.agent.name']"/value nutch-default.xml 


# 3.
# file handle version
# cf. /sf/ask/180980691/
curl -L -s -o nutch-default.xml 'http://svn.apache.org/viewvc/nutch/branches/branch-1.3/conf/nutch-default.xml?view=co&revision=1079746&content-type=text%2Fplain'
exec 3<nutch-default.xml
rm nutch-default.xml   # prevent open file from being truncated
xmlstarlet edit -u "/configuration/property[name='http.agent.name']"/value -v 'test' <&3 >nutch-default.xml
xmlstarlet sel -t -c "/configuration/property[name='http.agent.name']"/value nutch-default.xml