拡張子を一括して削除する

#!/bin/sh
#del_extension.sh

. f_askdir.sh
. f_askstring.sh

ask_directory 1
if [ $? -eq 1 ]; then
    exit 1
fi
echo "Target directory is \"${_DIRNAME}\""

ask_string "Input delete extension: " 0
EXTENSION=$_STR
echo "Delete Extension is \"${EXTENSION}\""

NUM=0
for FNAME in $_DIRNAME/*.$EXTENSION; do
    if [ -f "$FNAME" ]; then
        mv $FNAME ${FNAME%.$EXTENSION}
        NUM=$(expr $NUM + 1)
    fi
done
if [ $NUM -eq 0 ]; then
    echo "NO file."
else
    echo "*** Successful."
fi
unset _DIRNAME EXTENSION FNAME NUM _STR

$ ls
ab1.text ab2.text  ab3.text ab4.text  ab5.text

$ ./del_extension.sh 
Input Directory (Blank is Cancel.) : .
Target directory is "."
Input delete extension: text
Delete Extension is "text"
*** Successful.

$ ls
ab1 ab2 ab3 ab4 ab5