add leetcode

Author: wave-gbt

shell/195. Tenth Line.md

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+How would you print just the 10th line of a file?
+
+For example, assume that file.txt has the following content:
+
+```
+Line 1
+Line 2
+Line 3
+Line 4
+Line 5
+Line 6
+Line 7
+Line 8
+Line 9
+Line 10
+```
+Your script should output the tenth line, which is:
+
+```
+Line 10
+```
+
+**Hint:**
+1. If the file contains less than 10 lines, what should you output?
+2. There's at least three different solutions. Try to explore all possibilities.
+
+**Bash**
+```
+sed -n '10p' file.txt
+```