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I need to perform some operation if a target file is changed in the SVN repo. How can I test it?

More specifically, I have a local version of a doc.tex file from which I generate a doc.pdf file that is not on the server. If my local version of doc.tex file is outdated I want to copy the doc.pdf file to doc-old.pdf, than update the doc.tex, generate the new doc.pdf file and, finally, compare the two pdfs.

The only step I miss is the checking for updates of the doc.tex file on server.

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The solution I adopted is:

if svn diff -r BASE:HEAD ./doc/guidelines/typesetter-guidelines.tex | grep -q ^
    then echo "Out of date"
    else echo "Updated"
fi 

Is there any contraindication? Can I do better than this?

|improve this answer|||||
  • I don't know what that svn command outputs for an up-to-date or not up-to-date file, but wouldn't grep -q ^ just return true for any output that is not empty? – Kusalananda Jun 30 '17 at 10:39
  • @Kusalananda Indeed if the files if up-to-date there will be no output. – Gabriele Nicolardi Jun 30 '17 at 10:54

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