clear echo \"Enter first file name: \" read f1 if [ -f $f1 ] then echo \"Enter new extention: \" read e cp ${f1} ${f1}.$e # i=basename $f1 # b= $i txt # for file in *.txt # i=\`basename file txt\` # mv $file $i doc echo $f1\".\"$e\" file is created\" else echo \"File not Exist \" fi