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Top Forums UNIX for Advanced & Expert Users Detecting unused variables... Post 302973523 by Corona688 on Wednesday 18th of May 2016 10:14:36 AM
Old 05-18-2016
Quote:
Originally Posted by wisecracker
As for the rest my code is designed to be as "bash" backwards compatible as is possible, and I am ignoring the 'printf' statements as errors.
Backwards compatible with what? It's already meant for bash, so I assume you mean sh... You store binary data in shell variables -- I wouldn't trust that to work in anything but brand-name BASH, and very modern BASH at that.

The problems it flags with printf are all legit, btw. What would happen if your binary data included a meaningless % character, just incidentally? printf would bomb, that's what, because % is not meaningless to printf. printf "%s" "$data" avoids that problem.
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PRINTF(1)								FSF								 PRINTF(1)

NAME
printf - format and print data SYNOPSIS
printf FORMAT [ARGUMENT]... printf OPTION DESCRIPTION
NOTE: your shell may have its own version of printf which will supercede the version described here. Please refer to your shell's documen- tation for details about the options it supports. Print ARGUMENT(s) according to FORMAT. --help display this help and exit --version output version information and exit FORMAT controls the output as in C printf. Interpreted sequences are: " double quote NNN character with octal value NNN (0 to 3 digits) \ backslash a alert (BEL)  backspace c produce no further output f form feed new line carriage return horizontal tab v vertical tab xNNN byte with hexadecimal value NNN (1 to 3 digits) uNNNN character with hexadecimal value NNNN (4 digits) UNNNNNNNN character with hexadecimal value NNNNNNNN (8 digits) %% a single % %b ARGUMENT as a string with `' escapes interpreted and all C format specifications ending with one of diouxXfeEgGcs, with ARGUMENTs converted to proper type first. Variable widths are han- dled. AUTHOR
Written by David MacKenzie. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
The full documentation for printf is maintained as a Texinfo manual. If the info and printf programs are properly installed at your site, the command info printf should give you access to the complete manual. GNU coreutils 4.5.3 February 2003 PRINTF(1)
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