macos - Rename txt files based on the file's content (OSX)

I have about 250 txt files that are all named link.txt and they have this information always on the line/row 3:

title: Some kind of title

I need some kind of script that can go through these files, grab the title and put it as the filename. The folder structure is: 1-links/20150528/1/ so would be great if I could just run the script in "1-links" and it would start looking for files named "link.txt".

I'm using Mac OSX.

Can anyone help me out?

Answer

Something like can do the work:

for i in `find . -name link.txt -type f`;
do

nn=$(sed -n -e 3p -e "s/title:\ // "$i")
mv "$i" "`dirname $i`/$nn"
done

If you want to rename last directory in the path instead of file you can use something like:

for i in `find . -name link.txt -type f`;
do
nn=$(sed  -n -e 's/title: //'  -e 3p $i)

odir=`dirname $i`
ndir=$(echo $odir|awk -v nn="$nn" -F\/ 'BEGIN {OFS="/"}  {$NF=nn;print}')
mv  "$odir" "$ndir"
done