The first regex will match a person whitespace character. The second regex will reluctantly match a number of whitespace characters. For some purposes, these two regexes are really similar, except in the next situation, the regex can match much more of your string, if it helps prevent the regex match from failing. from
Utilizing %s in scanf without having an explcit discipline width opens the identical buffer overflow exploit that receives did; particularly, if you will discover more people inside the enter stream compared to the concentrate on buffer is sized to carry, scanf will Fortunately publish Individuals extra characters to memory outdoors the buffer, likely clobbering something essential. Sad to say, contrary to in printf, You cannot provide the field with for a operate time argument:
Cmd /S is quite useful because it saves you acquiring to worry about "quoting prices". Recall which the /C argument implies "execute this command as though I'd typed it for the prompt, then Give up".
this assignation can be done at initialization like char phrase="this is the word" // the term array of chars obtained this string now and is also statically outlined
And since your second parameter is vacant string "", there is no difference between the output of two instances.
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So the primary if statement translates to: in the event you have not handed me an argument, I'm going to inform you how you need to go me an argument in the future, e.g. you will see this on-monitor:
If the value is bigger than four character positions large, the sector width expands to support the appropriate variety of figures.
then the string MY_COMMAND will probably be parsed particularly as if it have here been typed on the command prompt. If you're taking command-line input through the consumer, or if you are a library processing a command line supplied by an application, that's in all probability a good idea. For example, the C runtime library procedure() purpose could possibly be carried out in this manner.
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This executes SomeCommand.exe redirecting normal output to some temp file and normal error to precisely the same area:
The kernel does not have the luxury in the libc library to take care of the First set up of varied means.
First of all you must recognize that ultimate output of both equally the statements will be same i.e. to eliminate the many spaces from given string.
So For those who have a complicated command which you wish to pass to CMD.exe you possibly have to recall CMD's argument quoting regulations, and effectively escape the entire quotations, or use /S, which triggers a Distinctive non-parsing rule of "Strip 1st and very last " and handle all other figures as being the command to execute unchanged".
This is most likely extra very likely to be attractive inside the circumstance within the query Michael Burr linked to, where by cmd.exe is remaining released by CreateProcess in lieu of from the batch file or maybe the command line alone..
The next if statement checks to view if the 'database-title' you passed to your script actually exists within the filesystem. Otherwise, you will get a concept similar to this: