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# cat tst
20120608: [TXT 120k-130k(130k), manachan]
20120608: [TXT 120k-130k(130k), natsumi]
............
20120608: [Full TxT 120k-130k(130k), manatsu]
..........
2012031201: [TXT...

change the below line


corr_date=`awk 'END {print $1, $2, $3;}' $Date`
to
corr_date=`echo $Date | awk 'END {print $1, $2, $3;}'`

I think you can simplify things a bit by using a single awk to suss out the last record of the file in $i and assign it to corr_date:


corr_date=$( awk 'END { print $1, $2, $3; }' $i )


Your...

one way:

var=123.1
check=$(echo "$var" | tr -d '[:digit:]' | tr -d '.')
if [ -z "$check" ]; then
echo 'is all digits'
else
echo 'is not all digits'
fi