12-18-2016
Let me applaud you to your efforts to circumnavigate the problems you encountered and to your (can I say: ) endurance in finding a solution on your own, as opposed to coming back whining immediately. Other members could certainly take a leaf out of your book!
Trying to answer some of your questions:
- I'd be surprised if extra lines were added if the loop starts with i=1, at least it didn't when I tested it. And, why should it?
- /var/ in awk is a regex constant, so it would try to match the sequence of chars'v', 'a', and 'r'. Your last approach is the right one to match variables.
- awk works on pattern {action} pairs. action is executed if pattern is TRUE. So, F is equivalent to F != 0 as awk treats 0 as FALSE and anything else as TRUE.
- shell scripts are interpreted line by line, even in a loop, and files for e.g. output are opened and closed for every redirection encountered (e.g. echo or printf command). awk reads a script, compiles, and executes it. Files are kept open unless explicitly closed. This will make up for the main execution time difference. Although you are not using external commands (which would consume resources for a process creation for each and make it even slower), some of your statements could be improved.
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LEARN ABOUT DEBIAN
srec_fairchild
srec_fairchild(5) File Formats Manual srec_fairchild(5)
NAME
srec_fairchild - Fairchild Fairbug file format
DESCRIPTION
The Fairchild Fairbug format has 8-byte records. A file begins with an address record and ends with an end-of-file record.
There are three record types in this file format.
Address records are of the form
+--+------+
|S | nnnn |
indicating the address for the following data records. +--+------+
Data records are of the form
+--+------------------+---+
|X | ffffffffffffffff | c |
Each data record begins with an X and always contains+8-data-bytes.--The-ff+characters are hexadecimal byte values (8 bytes). Each data
byte is represented by 2 hexadecimal characters. The c character is a hex digit being the the nibble-sum of the data bytes. A 1-digit
hexadecimal checksum follows the data in each data record. The checksum represents, in hexadecimal notation, the sum of the binary equiva-
lents of the 16 digits in the record; the half carry from the fourth bit is ignored. The programmer ignores any character (except for
address characters and the asterisk character, which terminates the data transfer) between a checksum and the start character of the next
data record. This space can be used for comments.
The end-of-file record has the form
+--+
|* |
The last record consists of an asterisk only, which indicates the end-of file.
Size Multiplier
In general, binary data will expand in sized by approximately 2.4 times when represented with this format.
EXAMPLE
Here is an example Fairchild Fairbug file. It contains the data "Hello, World[rq] to be loaded at address 0x1000. Notice how the last
record is padded with 0xFF bytes.
S1000
X48656C6C6F2C2057C
X6F726C64210AFFFF3
*
COPYRIGHT
srec_cat version 1.58
Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Peter Miller
The srec_cat program comes with ABSOLUTELY NO WARRANTY; for details use the 'srec_cat -VERSion License' command. This is free software and
you are welcome to redistribute it under certain conditions; for details use the 'srec_cat -VERSion License' command.
AUTHOR
Peter Miller E-Mail: pmiller@opensource.org.au
//* WWW: http://miller.emu.id.au/pmiller/
Reference Manual SRecord srec_fairchild(5)