Shell Programming and Scripting

file=model_001.in
file_without_extn=${file%.*}

#!/bin/ksh or bash or ...
for f in *.in
do
     d=${f%.*}
     [ ! -d "$d" ] && mkdir "$d" 2>/dev/null
     [ ! -d "$d" ] && echo error $d && continue
     mv -f "$f" "$d" 2>/dev/null
done

#!/bin/sh

set -e
for f in *.in
do
     d=${f%.*}
     if [ ! -d "$d" ]; then
        mkdir "$d" 
     fi
     mv -f "$f" "$d"
done

f=model_001.in

d=${f%_*.*}

echo $d
model

if [ ! -d "$d" ]; then