added sollution for exc02.sh

showline.sh

@@ -0,0 +1,22 @@
+#!/bin/bash          
+# Write an script that accepts a file name and a number as its parameter, 
+# Then return the content of that line number in that file. 
+
+if [ $# -ne 2 ]; then
+        echo "Usage showline fileName lineNumber"
+        exit -1
+fi
+
+file=$1
+line=$2
+
+if [ -e "$file" ]; then
+        totalLines=`wc -l $file | cut -d" " -f1`
+        if [ $line -le $totalLines ]; then
+                cat $file|sed -n "$line"p
+        else
+                echo "File exists but line does not exists!"
+        fi
+else
+        echo "File does not exists!"
+fi