UNIX for Dummies Questions & Answers

2011-07-01  100.0
2011-07-02  101.0
2011-07-03  101.7

abc  2011-07-01  100.0
abc  2011-07-02  101.0
abc  2011-07-03  101.7

for file in *.dat; do
  $prepend=`echo $file | cut -d "." -f 1`
  sed -i '' -e 's/^/$prepend /' $file
done

perl -i -pe '$ARGV=~s/\..*//;$_="$ARGV\t$_"' *.dat

#!/bin/bash
perl -i -pe '$ARGV=~s/\..*//;$_="$ARGV\t$_"' *.dat

for file in *.dat;do while read line;do echo -e "${file/.dat/}"\\t"$line";done < "$file";done