Shell Programming and Scripting

for file in `ls file*`;
do
mv $file `echo $file | sed s:file:file-:`
done

#!/bin/bash

for FILE in file*
do
        echo mv "$FILE" file-"${FILE:4}"
done

#!/bin/bash

# Make variable splitting happen on "."
IFS="."

for FILE in file*
do
        # Set $1="filename", $2="ext", because it splits on "."
        set -- $FILE

        echo mv "$FILE" file-"${1:4}"
done

#!/bin/bash
for i in file*; do
  mv "$i" `echo "$i" | sed 's/file/file-/ ; s/\.dat//'`
done