2)
#!/bin/bash
if [ "$#" != "2" ]
then
echo "USAGE : $0 file1 file2"
exit 1
fi

file1=$1
file2=$2
proverka=0
if [ ! -f $file1 ]
then
echo "Datoteka so ime $file1 ne postoi "
proverka=$(( $proverka + 1))
fi

if [ ! -f $file2 ]
then
echo "Datoteka so ime $file2 ne postoi"
proverka=$(( $proverka + 1))
fi

if [ "$proverka" "!=" "0" ]
then
exit 0
fi

dat1=`cat $file1`
dat2=`cat $file2`

if [ "$dat1" = "$dat2" ]
then
rm $file2
else
ime1=`echo $file1 | sed 's/\..*$//'`
ime2=`echo $file2 | sed 's/\..*$//'`
glavnoIme="${ime1}_${ime2}.txt"
cat $file1 $file2 > $glavnoIme
fi