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Full Discussion: The Ampersand
Top Forums Programming The Ampersand Post 302140073 by jim mcnamara on Wednesday 10th of October 2007 03:15:05 PM
Old 10-10-2007
If you mean you want to run a shell script or command-line request then you have to
call fork(), one of the exec calls. This calls a shell like /usr/bin/sh to execute the command. In the parent, you DO NOT call wait() or waitpid() until your parent is ready to exit, or expects the child to be done or wants to wait idly while the child runs.

You can use the WNOHANG option (not on all systems) to get waitpid() to simply check status of the child and return immediately regardless. Meaning: no waiting.
 

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Tcl_Concat(3)						      Tcl Library Procedures						     Tcl_Concat(3)

__________________________________________________________________________________________________________________________________________________

NAME
Tcl_Concat - concatenate a collection of strings SYNOPSIS
#include <tcl.h> CONST char * Tcl_Concat(argc, argv) ARGUMENTS
int argc (in) Number of strings. CONST char * CONST argv[](in) Array of strings to concatenate. Must have argc entries. _________________________________________________________________ DESCRIPTION
Tcl_Concat is a utility procedure used by several of the Tcl commands. Given a collection of strings, it concatenates them together into a single string, with the original strings separated by spaces. This procedure behaves differently than Tcl_Merge, in that the arguments are simply concatenated: no effort is made to ensure proper list structure. However, in most common usage the arguments will all be proper lists themselves; if this is true, then the result will also have proper list structure. Tcl_Concat eliminates leading and trailing white space as it copies strings from argv to the result. If an element of argv consists of nothing but white space, then that string is ignored entirely. This white-space removal was added to make the output of the concat command cleaner-looking. The result string is dynamically allocated using Tcl_Alloc; the caller must eventually release the space by calling Tcl_Free. | SEE ALSO
| Tcl_ConcatObj | KEYWORDS
| concatenate, strings | Tcl 7.5 Tcl_Concat(3)
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