Solve some problems in Bash

bash/193.sh

@@ -0,0 +1,2 @@
+# Read from the file file.txt and output all valid phone numbers to stdout.
+grep -P "^\(\d{3}\) \d{3}-\d{4}$|^\d{3}-\d{3}-\d{4}$" file.txt

bash/195.sh

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+# Read from the file file.txt and output the tenth line to stdout.
+head -n 10 file.txt | tail -n +10