You can use the range operator on the command line, like so:
perl -ne "print if m{^\s*HW/OS/Client:} ... m{^\s*$}" mas01_policy_dum
+p.txt

[download]

which tells Perl to go through every line of the given file and print lines in-between (inclusive) two lines which match:

In reply to Re^5: How to print certain lines out of a text file. by repellent
in thread How to print certain lines out of a text file. by sawdustar

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