[ALUG] Wildcards gone wild

[Howard L Frederick]

That was going to be my next question, how to prevent it. Thanks!

On 27 June, 2014 at 19:18:24, Andreas Tauscher via Linux (linux at lists.habari.co.tz) wrote:

Am 06/27/2014 06:00 PM, schrieb Howard L Frederick:
> That is seriously scary.

But easy to prevent:

* Double-quote all variable references and command substitutions.
Instead $var use "$var"
* Set IFS to just newline and tab IFS="$(printf '\n\t')"
* Prefix all path/file names with ./ so they cannot expand to begin with
“-”. "rm *" will expand a file named -rf to
rm file1 file2 file3 ..... -rf
rm ./* will expand to
rm ./file1 ./file2 ./file3 ..... ./-rf
* Be careful about file names. They might contain control characters,
not printable character. Filtering out all not printable chars can be
done with something like this: printf '%s' "$file" | LC_ALL=POSIX tr -d
'[:cntrl:]' | iconv -cs -f UTF-8 -t UTF-8


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