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Use "strcmp" for strings (char *). See man 3 strcmp.

In C, variables can be accessed in 2 ways: directly, or as pointers, where a pointer is, basically, the address where the memory reserved for that variable starts. Now here's the funny thing: there...

In function arguments It is a pointer.

It is the maximum number of chars that you can get in the buffer (1 is needed for the last '\0'). So if you input more you can't overflow the buffer.
...

His code is checking for any character(s) followed by a character that is not a number, followed by any character(s). I think you've missed seeing the bang (!) which implies not 0-9:


(...

Are you using bash or Kshell?

This should work regardless:

while [ "$author" = "" -a "$title" = ""];

You want to loop when both strings are empty (and) rather than one or the other. I'm...

( [!0-9]|"" )

will just match a single character. If the user enters "a" it will print the error, but if the user enters "aa" it will not. So, by adding the two wildcard characters, you allow it...

Try:
sed "s/$title:$author:$price:$qtyAvailable:$qtySold/$Ntitle:$author:$price:$qtyAvailable:$qtySold/"

Jean-Pierre.

c1=`grep -w $title BookDB.txt |grep -w $author|wc -l` #cannot work when got space


Give the sample contents of BookDB.txt

and you can use grep -c for counting ( instead of wc -l)

$title expands to whatever the value of it was. So, how would you grep a file for a string with spaces in it? With quotes of course -- in this case, use double quotes because single quotes makes...