test_head.sh

##### HEAD_COMMAND
#!/bin/bash

x=$1
i=0
while read line
do
        echo $line

        ((i++))

        if [ $i -gt $x ]
        then
                exit
        fi
done < test.log


########Tail_COmmand

#!/bin/bash


word_count=$(wc -l test.log |awk '{print $1}')
line_count=$2


stop_word=$[ $word_count - $line_count ]

i=0
junk=0
while read line
do

        if [ $i -le $stop_word  ]
        then
                junk=$[junk+1]
        else
                echo $line
        fi
        i=$[i+1]

done < test.log