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Top Forums Shell Programming and Scripting Random Password generator with 2 digits and 6 characters Post 303024085 by Don Cragun on Friday 28th of September 2018 06:39:43 PM
Old 09-28-2018
Hi Scrutinizer,
I like your code better than mine. But if my dd was terminating on a SIGPIPE signal and generating an unwanted diagnostic for infernalhell, I don't see why the fold in your pipeline wouldn't suffer from the same fate.

Given that PIPE_BUF has a minimum allowed size of 512 bytes, using the following:
Code:
dd cbs=1 conv=unblock ibs=256 count=1

instead of:
Code:
fold -w1

might avoid the diagnostic message. But, of course, if 2 numeric characters and 6 alphabetic characters aren't found in the first 256 alphanumeric characters found in the data in /dev/random you won't get any output from your script. I would expect the likelihood of that happening being less than 3%.
 

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FOLD(1) 						    BSD General Commands Manual 						   FOLD(1)

NAME
fold -- fold long lines for finite width output device SYNOPSIS
fold [-bs] [-w width] [file ...] DESCRIPTION
fold is a filter which folds the contents of the specified files, or the standard input if no files are specified, breaking the lines to have a maximum of 80 characters. The options are as follows: -b Count width in bytes rather than column positions. -s Fold line after the last blank character within the first width column positions (or bytes). -w width Specifies width to use as a line width, instead of the default 80 characters. ENVIRONMENT
LC_CTYPE EXIT STATUS
The fold utility exits 0 on success, and >0 if an error occurs. SEE ALSO
expand(1), fmt(1) STANDARDS
The fold utility conforms to IEEE Std 1003.1-2008 (``POSIX.1''). BUGS
If underlining is present it may be messed up by folding. Width should be a multiple of 8 if tabs are present, or the tabs should be expanded using expand(1) before using fold. BSD
September 15, 2011 BSD
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