The 's' replaces just one Area match at any given time nevertheless the 's+' replaces the whole House sequence without delay with the second parameter.
Applying %s in scanf without having an explcit subject width opens the identical buffer overflow exploit that will get did; specifically, if you will find far more people in the input stream as opposed to goal buffer is sized to hold, scanf will Fortunately write those further people to memory outside the buffer, perhaps clobbering a little something significant. Unfortunately, not like in printf, You can not source the field with as a operate time argument:
But it surely will not do any damage, and this means the code would still perform precisely the same way Regardless how the command remaining handed was changed.
Windows, which derives finally from CP/M and VAX, would not use This technique internally. To your functioning process, the command line is simply a single string of figures.
And because your second parameter is vacant string "", there isn't a distinction between the output of two situations.
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The %s token permits me to insert (and probably format) a string. Notice which the %s token is replaced by no matter what I pass to the string once the % image.
The primary 1 matches a single whitespace, While the next 1 matches just one or several whitespaces. They are the so-referred to as frequent expression quantifiers, and they complete matches similar to this (taken from your documentation):
This is often quite typical error-examining code for your Python script that accepts command-line arguments.
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This executes SomeCommand.exe redirecting common output to the temp file and normal error to precisely the same location:
@barlop, the point of /S is if you don't know in advance whether or not the command has embedded quotes or not. If you'll find specifically two quotations about the command line it truly is treated differently by default if you will discover specifically check here two estimate people than if you can find far more or less. /S causes it to be be treated precisely the same. It's documented: Just style "assist cmd" about the command line.
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So In case you have a complicated command which you would like to move to CMD.exe you either have to recall CMD's argument quoting regulations, and adequately escape the entire rates, or use /S, which triggers a Unique non-parsing rule of "Strip initially and last " and take care of all other figures as being the command to execute unchanged".
Nonetheless x.replaceAll("s+", ""); will be extra economical method of trimming spaces (if string might have many contiguous Areas) since of doubtless significantly less no of replacements because of the to undeniable fact that regex s+ matches one or even more spaces at the same time and replaces them with vacant string.
Another if assertion checks to see In the event the 'database-title' you handed into the script actually exists around the filesystem. Otherwise, you will get a concept like this: