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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)							   User Commands							 PRINTF(1)

NAME
printf - format and print data SYNOPSIS
printf FORMAT [ARGUMENT]... printf OPTION DESCRIPTION
Print ARGUMENT(s) according to FORMAT, or execute according to OPTION: --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 (1 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 xHH byte with hexadecimal value HH (1 to 2 digits) uHHHH Unicode (ISO/IEC 10646) character with hex value HHHH (4 digits) UHHHHHHHH Unicode character with hex value HHHHHHHH (8 digits) %% a single % %b ARGUMENT as a string with `' escapes interpreted, except that octal escapes are of the form or NNN and all C format specifications ending with one of diouxXfeEgGcs, with ARGUMENTs converted to proper type first. Variable widths are han- dled. NOTE: your shell may have its own version of printf, which usually supersedes the version described here. Please refer to your shell's documentation for details about the options it supports. AUTHOR
Written by David MacKenzie. REPORTING BUGS
Report printf bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> COPYRIGHT
Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
printf(3) 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 coreutils 'printf invocation' should give you access to the complete manual. GNU coreutils 7.1 July 2010 PRINTF(1)
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