Bash – create XML file using bash script

bashecholinuxsedxml

I want create simple xml file using bash script ( not with dom )

but when I set value in the line then echo print the $lorem word and not the val

lorem=LOL

echo '<root><foo a="b">$lorem</foo><bar value="ipsum" /></root>' >> $MY_XML

I also try this

echo '<root><foo a="b">\$lorem</foo><bar value="ipsum" /></root>' >> $MY_XML

echo '<root><foo a="b">"$lorem"</foo><bar value="ipsum" /></root>' >> $MY_XML

echo '<root><foo a="b">\"$lorem\"</foo><bar value="ipsum" /></root>' >> $MY_XML

but all these print the exactly the line and not the val

please advice how to print the val $lorem ? as the following example

 <root><foo a="b">LOL</foo><bar value="ipsum" /></root>

Best Answer

Print the line on this way:

echo '<root><foo a="b">'"$lorem"'</foo><bar value="ipsum" /></root>' >> "$MY_XML"

This is need because single quotes deny shell interpreter from replace environment variables inside

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Shell – Get text output from shell script commands on screen while execution

You can get the shell to echo everything it is doing, by running the following command:

sh -x yourscript

Or you can add this as the first command in the script:

set -x

It can get a bit too verbose, though. It's OK for debugging, but if you want selective output it would be best to do it yourself with carefully places echo commands.

Search replace in XML file with sed or awk

I think that there are a couple of problems in your sed command:

You don't use the -n option, so by default sed just prints every line of input to the output (possibly modified by a sed command).
You don't need the redirection < c3.xml, because sed recognizes the last argument as a filename.
sed is not very well suited for matches over multiple lines. See for example here.

The following seems to work on your example:

sed -n "/<fmreq:name>object_name<\/fmreq:name>/ {n;p}" c3.xml | sed "s/^\s*<fmreq:value>\(.*\)<\/fmreq:value>/\1/g"

Or, with only one sed invocation:

sed -n "/<fmreq:name>object_name<\/fmreq\:name>/ {n;s/^\s*<fmreq:value>\(.*\)<\/fmreq:value>/\1/g;p}" c3.xml

Breakdown of what this command does:

The option -n tells sed not to print the pattern space after it's finished processing the line. Consequently, you need to use the command p explicitely to do so.
/regex/ tells sed to execute the commands that follow only on the lines that match regex.
The sed command n replaces the content of the pattern space by the next line of input, which is the one containing the value you are interested in.
The sed command s/regex/replacement/ substitutes the first match of regex in the pattern space by replacement.
The sed command p prints the line.

Best Answer

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Shell – Get text output from shell script commands on screen while execution

Search replace in XML file with sed or awk

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