1.USERLOG

until who | grep "^$1" > /dev/null
do
   sleep 5
done
echo $1 started a session!!!


2.USER_MESSAGE

echo ENTER THE MESSAGE
read MESSAGE
for each
do
        if who | grep "^$each" > /dev/null
        then
            echo $MESSAGE | write $each
        fi
done


3.COPYREADABLE


num=0
if ! test -d $HOME/$1
then mkdir $HOME/$1
else
   for each in *
   do if test -f $each -a -r $each
         then cp $each $HOME/$1      //ako imame usera $each , kopirame papkata mu i q prashtame v HOME direktoriqtra
         else num=`expr $num + 1`
      fi
   done
echo "$num nonaccessible files"
fi


4.USERLOG1


while true
do
  if who | grep "^$1" > /dev/null
  then
      echo $1 works
      break
  else
      sleep 5
  fi
done


5.TOT_CI

fdir1=`ls $1/*.c | wc -l`
fdir2=`ls $2/*.c | wc -l`
totbr=`expr $fdir1 + $fdir2`
if [ $totbr -gt 20 ]
then
        ls $1/*.c > filenames
        ls $2/*.c >> filenames
        chmod a=r filenames
else
        echo "Total number of files less than 20=$totbr"
fi


6.OUT_FILES


fdir1=`ls $1/*.out | wc -l`
fdir2=`ls $2/*.out | wc -l`
if [ $fdir1 -gt $fdir2 ]
then
        mkdir NEWdir
        echo "Name of the new directory --> NEWdir"
        tag_dir=$PWD/NEWdir
        cd $1
        for i in *
        do
            if [ -f $i -a -r $i -a -w $i ]
            then
                mv $i $tag_dir
            fi
        done
fi


7.CHEKSIZE


if ! [ -d $1 ]
then
        echo "Directory $1 does not exist"
else
     cd $1
     for i in *
     do
        size=`wc -c < $i `
        if [ -f $i ]
        then
                if [ $size -gt $2 ]
                then
                    echo "File $i has > $2 bytes"
                fi
        fi
     done
fi