concat(3tcl) [debian man page]

concat(3tcl)						       Tcl Built-In Commands						      concat(3tcl)

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NAME

       concat - Join lists together

SYNOPSIS

       concat ?arg arg ...?
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DESCRIPTION

       This  command  joins  each of its arguments together with spaces after trimming leading and trailing white-space from each of them.  If all
       the arguments are lists, this has the same effect as concatenating them into a single list.  It permits any number of arguments; if no args
       are supplied, the result is an empty string.

EXAMPLES

       Although concat will concatenate lists, flattening them in the process (so giving the following interactive session):

	      % concat a b {c d e} {f {g h}}
	      a b c d e f {g h}

       it will also concatenate things that are not lists, as can be seen from this session:

	      % concat " a b {c   " d "  e} f"
	      a b {c d e} f

       Note also that the concatenation does not remove spaces from the middle of values, as can be seen here:

	      % concat "a   b	c" { d e f }
	      a   b   c d e f

       (i.e., there are three spaces between each of the a, the b and the c).

SEE ALSO

       append(3tcl), eval(3tcl), join(3tcl)

KEYWORDS

       concatenate, join, lists

Tcl									8.3							      concat(3tcl)

Tcl_Concat(3tcl)					      Tcl Library Procedures						  Tcl_Concat(3tcl)

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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.
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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(3tcl)