UNIX for Dummies Questions & Answers

renchar="2"
for file in `ls /directory`
do
prefix=`echo ${file} | cut -c1-4`
suffix=`echo ${file} | cut -c6-`
mv ${file} ${prefix}${renchar}${suffix}
done

 
ls: 0653-341 The file /directory does not exist

 
for i in FILE*; do mv $i ${i/FILE1/FILE2}; done

for i in FILE*; do mv $i ${i/FILE2/FILE1}; done

ksh: ${i/FILE1/FILE2}: 0403-011 The specified substitution is not valid for this command.

renchar="2"
for file in `ls`
do
prefix=`echo ${file} | cut -c1-3`
suffix=`echo ${file} | cut -c5-`
mv ${file} ${prefix}${suffix}
done

FILE20001.txt
FILE20002.txt
FILE20003.txt

for i in FILE1*; do 
  mv "$i" "FILE2${i#FILE1}"
done