Update a XML file using Korn Shell

[kre1973]

I have the following XML file called: Today.xml in which I want to insert the current time in the node called: <TODAY>.

<?xml version="1.0" standalone="yes"?>
<MSR>
  <Info>
    <TEEFHR />
    <TEPP />
    <TNC />
    <TODAY />
    <UPDATE />
    <UMZ />
    <UMZT />
    </Info>
</MSR>

thanks

 

[kre1973]

I guess using AWK or SED would be fine also.

 

[feherke]

Hi

Like this ?

sed "s!<TODAY />!<TODAY>$( date )</TODAY>!" /input/file

Feherke.

http://rootshell.be/~feherke/

 

[kre1973]

It works, but I need to save the updated XML file.

 

[feherke]

Hi

If your [tt]sed[/tt] supports in-place editing, then :

sed [red]-i[/red] "s!<TODAY />!<TODAY>$( date )</TODAY>!" /input/file

Otherwise you can do "manually" what [tt]sed[/tt] does when using -i :

tempfile="$( mktemp '/tmp/sedXXXXXX' )"
sed "s!<TODAY />!<TODAY>$( date )</TODAY>!" "/input/file" > "$tempfile"
chown --reference="/input/file" "$tempfile"
chmod --reference="/input/file" "$tempfile"
mv "$tempfile" "/input/file"

Of course, your [tt]chown[/tt] and [tt]chmod[/tt] may not support the --reference option, or the [tt]mktemp[/tt] may have different syntax. So in fewer words :

sed "s!<TODAY />!<TODAY>$( date )</TODAY>!" "/input/file" > "/output/file"

Feherke.

http://rootshell.be/~feherke/

 

[Annihilannic]

Rather than chowning and stuff I would typically use cp -p to preserve ownership, timestamp and permissions, e.g.

cp -p filename.xml filename.xml.orig
sed "s!<TODAY />!<TODAY>$( date )</TODAY>!" filename.xml.orig > filename.xml

Annihilannic.

 

[feherke]

Hi

I avoided [tt]cp[/tt] because the file size is unknown and copying could add speed and storage problem. ( I think this is why neither [tt]sed[/tt] does the copying. )

Anyway, your suggested way has a good point too, it preserves the inode.

But also raises a question : why the -p ?

Feherke.

http://rootshell.be/~feherke/

 

[Annihilannic]

... I would typically use cp -p to preserve ownership, timestamp and permissions, e.g.

I like the backed up .orig file to have the timestamp unchanged, so I know when it was previously changed or created...

Annihilannic.

 

[feherke]

Hi

So you intend to keep the .orig. I considered it a temporary one. Thanks.

Feherke.

http://rootshell.be/~feherke/