[clug] Ever received a .dat file from an <other OS> user?

Anthony David adavid at adavid.com.au
Fri Jan 15 07:32:36 MST 2010

Peter Barker wrote:
> On Fri, 15 Jan 2010, Adam Baxter wrote:
>> What do the \ ?_? wildcards do?
> \ is escaping the following space.  The question marks stand for any 
> single character.  So the pattern "part\ ?_?.dat" will match:
> "part 1_1.dat"
> "part a_b.dat"
> See "Pattern Matching" in "man bash".
> While we're on shell scripting.... a question of my own.
> I vaguely recall a safe way of doing this:
> rm -rf $dir_i_do_not_want/$subdir_i_do_not_want.
> This is... somewhat unsafe, particularly when run by root.  I *think* 
> I recall a shell trick to turn this into a safe operation, so you 
> *don't* do something unfortunate to your system should those variables 
> be empty.  Any takers?
Hi Peter

One way might be testing for non-zero length strings

[ -n "$dir_i_do_not_want" ] && [ -n "$subdir_i_do_not_want" ] && rm -rf 

> Yours,

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