OS Lab 6

1.
#!/bin/bash
read ind
broj=`last | grep $ind | wc -l`
if [ "$broj" == "0" ]
    then
        echo "Ne e nikogas"
    else
        echo "Najaven e $broj"
fi

2.
#!/bin/bash
read ind
broj=`who | grep $ind | wc -l`
while [ "$broj" == 0 ]
do
    echo "$ind ne e najaven"
    sleep 10
done
echo "$ind e najaven"

3.
#!/bin/bash
if [ ! -d "backup" ]
then mkdir "backup"
fi
lista=`ls | grep '\.txt'`
for el in $lista
do
    cp $el backup
done

4.
#!/bin/bash
read prv vtor tret
lista=($prv $vtor $tret)
if [ ${lista[0]} -gt ${lista[1]} ]
then lista=(${lista[1]} ${lista[0]} ${lista[2]})
fi
if [ ${lista[1]} -gt ${lista[2]} ]
then lista=(${lista[0]} ${lista[2]} ${lista[1]})
fi
if [ ${lista[0]} -gt ${lista[1]} ]
then lista=(${lista[1]} ${lista[0]} ${lista[2]})
fi
echo ${lista[*]}

6.
#!/bin/bash
ls -p | sed -n '/^[0-9]*if*[0-9]/p' | wc -l

7.
#!/bin/bash
if [ $2 == "1" ]
then
    rm $1
else
    echo "Vnesi novo ime"
    read ime
    mv $1 $ime
fi

8.
#!/bin/bash
lista=("sobiranje" "odzemanje" "mnozenje" "delenje" "kraj")
select el in $lista
do
    case $el in
        "sobiranje") echo 'scale=25;$1+$2' | bc
        "odzemanje") echo 'scale=25;$1-$2' | bc
        "mnozenje")  echo 'scale=25;$1*$2' | bc
        "delenje")   echo 'scale=25;$1/$2' | bc
        "kraj") break
    esac
done