1. Linux question
What is ther Linux equivalent of the following DOS command?
IF EXIST FILE1.TXT DEL FILE1.TXT
(Does rm complain if you try to delete a non-existent file?)
Thanks.
-- Mike Nelson
2. Re: Linux question
Mike Nelson wrote:
> What is the Linux equivalent of the following DOS command?
>
> IF EXIST FILE1.TXT DEL FILE1.TXT
rm -f file1.txt
> (Does rm complain if you try to delete a non-existent file?)
Not if you use the -f (force) flag.
(It's a good job I parsed the DOS command as a whole, because doing an IF
EXIST usually depends on the shell you're using. ;) )
Carl
3. Linux question
I need to create unique temporary files, which I can do using
mktemp , i.e. system_exec('mktemp myprog.XXXXXX',0)
The question is, how do I find out what name mktemp has used
to create my file? The name is normally printed on the console,
and I don't kow how to redirect that so Euphoria can get to it.
Thanks,
Irv
4. Re: Linux question
You could do it like this:
function getrandfilename()
integer r1,r2,r3,limit
limit=1000000 -- some big number
r1=rand(limit)
r2=rand(limit)
r3=rand(limit)
return sprintf("%s",r1) & "." & sprintf("%s",r2) & "." &
sprintf("%s",r3) & ".tmp"
-- the filename would be a filename like '65783.999070.12.tmp'
-- the odds of creating a duplicate would be 1/limit^3 (very very
slim)
-- The '.' between each number is totally unnecessary.
end function
sequence myfile
myfile = getrandfilename()
I've been doing something like this in a program of mine to create unique
filenames, and it has worked perfectly well. I guess there's always a
chance of a duplicate, but there's a chance I'll win the Powerball lottery
too. Neither chance keeps me up at night.
Or, maybe you could do it with just Linux commands:
system_exec("declare -x `myprogXXXXXX`",0)
NOTE: In the command above, the single tics are back-tics (the one on the
same key as the tilde key, next to the 1 key). This command will create
an environment variable in RAM with the same name as the temp file it
creates. You can't use the '.' character in the name, but hey, you don't
really need to, anyway... Then just read the enviroment variable and
you've got your name...Some procedure using that might work for you. The
declared variable won't persist between shell sessions, though.
Using the back-tics are one of the coolest shell features of Unix, I
think... :)
--Ted
--On Saturday, April 21, 2001 08:29:54 AM -0500 Irv Mullins
<irvm at ellijay.com> wrote:
>
>
>
> I need to create unique temporary files, which I can do using
> mktemp , i.e. system_exec('mktemp myprog.XXXXXX',0)
>
> The question is, how do I find out what name mktemp has used
> to create my file? The name is normally printed on the console,
> and I don't kow how to redirect that so Euphoria can get to it.
>
> Thanks,
> Irv
>
>
>
>
>
5. Re: Linux question
> Irv Mullins wrote:
>> I need to create unique temporary files, which I can do using
>> mktemp , i.e. system_exec('mktemp myprog.XXXXXX',0)
>> The question is, how do I find out what name mktemp has used
>> to create my file? The name is normally printed on the console,
>> and I don't kow how to redirect that so Euphoria can get to it.
How about just using EU's date/time functions to create your own unique
'hex' character file name ?
