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Strange ,I am getting below

$cat a
abc def 1 xyz zzz
bca cde 2 yyy xxx
$sed -e 's/\(.*\)\([[:digit:]]\)\(.*\)/\1\|\2\3/' a
abc def |1 xyz zzz
bca cde |2 yyy xxx
$

Its just a variable ,added to take any other input that may present in the file ,
like
#1043 asd #Here asd will go to junk
If you are sure you have only one word per line ,you can skip this.

Use find, like
cd directory
while :
do
FileChanged=`find . - mmin -15 -print |wc -l`
if [ $FileChanged -eq 0]
then
cat * >input/mergefiles_`date +%s`
fi
Sleep 15
done

I=1
for t in `cat out.txt`
echo "create directory data_$i as" '"$t"' :"
i=`expr $i + 1`
done

---------- Post updated at 07:03 PM ---------- Previous update was at 07:02 PM ----------

The...

You can also use basename and the dirname to get the output
basename /tmp/abc.txt will give abc.txt
dirname /tmp/abc.txt will give /tmp