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For example, if I have the following raw data:
Timestamp: 00:55:46     SATID 17 VAL1 49 VAL2 038 SIGNAL 39 SATID 18 S
+ATID 17 VAL1 49 VAL2 038  SATID 19 VAL1 69 VAL2 015 SIGNAL NA        
+                            SATID 39 SATID 28 VAL1 36 VAL2 073 SIGNAL
+ 21
...

The “corrected” data line should be:
Timestamp: 00:55:46     SATID 17 VAL1 49 VAL2 038 SIGNAL 39           
+                          SATID 19 VAL1 69 VAL2 015 SIGNAL NA        
+                            SATID 39 SATID 28 VAL1 36 VAL2 073 SIGNAL
+ 21

#!/usr/bin/perl -l

...

__DATA__
Timestamp: 00:55:46     SATID 17 VAL1 49 VAL2 038 SIGNAL 39 SATID 18 S
+ATID 17 VAL1 49 VAL2 038  SATID 19 VAL1 69 VAL2 015 SIGNAL NA        
+                            SATID 39 SATID 28 VAL1 36 VAL2 073 SIGNAL
+ 21