10-15-2016
Hello Demas, welcome to unix.com!
In your school data the course number is missing. Please complete.
Please be aware that supplying sample data like channels.txt and registrations.txt usually helps, as does posting the syntax error messages.
On first sight, I see the following:
- missing double semicolons on a few of the cases.
- << opens a "here document", the syntax (and logics) for which you do not follow. It seems you would need an output redirection in those places.
- grep et al. don't need cat - they usually read the input files by themselves.
Last edited by RudiC; 10-15-2016 at 10:10 AM..
This User Gave Thanks to RudiC For This Post:
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LEARN ABOUT OPENSOLARIS
mktemp
mktemp(3C) Standard C Library Functions mktemp(3C)
NAME
mktemp - make a unique file name from a template
SYNOPSIS
#include <stdlib.h>
char *mktemp(char *template);
DESCRIPTION
The mktemp() function replaces the contents of the string pointed to by template with a unique file name, and returns template. The string
in template should look like a file name with six trailing 'X's; mktemp() will replace the 'X's with a character string that can be used to
create a unique file name. Only 26 unique file names per thread can be created for each unique template.
RETURN VALUES
The mktemp() function returns the pointer template. If a unique name cannot be created, template points to a null string.
ERRORS
No errors are defined.
EXAMPLES
Example 1 Generate a filename.
The following example replaces the contents of the "template" string with a 10-character filename beginning with the characters "file" and
returns a pointer to the "template" string that contains the new filename.
#include <stdlib.h>
...
char *template = "/tmp/fileXXXXXX";
char *ptr;
ptr = mktemp(template);
USAGE
Between the time a pathname is created and the file opened, it is possible for some other process to create a file with the same name. The
mkstemp(3C) function avoids this problem and is preferred over this function.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |Safe |
+-----------------------------+-----------------------------+
SEE ALSO
mkstemp(3C), tmpfile(3C), tmpnam(3C), attributes(5), standards(5)
SunOS 5.11 15 Sep 2004 mktemp(3C)