Talk:Concatenation

"Concate" & "nate" = "Concatenate"

Is this a kind of joke? The etymology is surely from Latin catena, a chain.

S.

Hi

HI :) —Preceding unsigned commentSDF added by 212.219.76.100 (talk) 10:22, 14 January 2008 (UTC)

According to Merriam-Webster, concatenate comes from the Latin concatenare (to link together), which comes from the Latin com- + catena. Nschoem 01:45, 26 June 2008 (UTC) —Preceding unsigned comment added by Nschoem (talk • contribs)

It just means to match the correct sequence of one data string to the same sequence in another data string...from 2 to 30 data strings long...

Syntax concatenation!! Everybody knows that!! —Preceding unsigned comment added by 166.20.224.14 (talk) 21:03, 2 August 2010 (UTC)

In Mainframe

Mainframe concatenation refers to defining and usage of a sequence of libraries for the purposes of accessing objects in those libraries.

CONCAT

CONCAT is a native command of the z/OS operating system which is used to define ISPF/TSO library allocations.

CONCAT can add libraries to any standard ISPF DD including SYSPROC SYSEXEC ISPPLIB ISPSLIB and ISPMLIB

CONCATD

CONCATD is a utility written and maintained by IBM which extends the functionality provided by CONCAT.

The CONCATD command performs the following functions:

 - Dynamically concatenates a data set or list of data sets before an existing or after an existing allocation.          
 - Deconcatenates from an existing ddname allocation.           
 - Creates an new allocation, if none exists.                   
 - Frees the whole file, if the caller deconcatenates all data sets of an existing allocation.                         
 - Lists the file allocation, if the file keyword and the list operand were used.                                      
 - Shows the CONCATD version, if invoked without operands       
 - Shows the CONCATD syntax, if invoked with an ? as operand    
 - Allocates the file with the permanently allocated attribute, if the PERM keyword was entered, or if the file already exists with an permanently allocated attribute. 
 - Displays all the members of PO concatenated data sets        
 - Displays all the ENQueuers when an OLD allocation fails      

Common usage of CONCATD is to concatenate personal libraries before libraries defined by the default system logon PROC. This allows a user to run CLIST and REXX programs without needing to specify the library where the code is.

This is the difference between issuing a command to execute code in a specific location:

TSO EXEC 'MY.USERID(MYREXX)'

versus issuing a command to execute a program for which may be in any library currently concatenated to the user's ISPF/TSO profile:

TSO MYREXX

In the second example, the system checks in each library concatenated to the user's ISPF/TSO profile (in this example the SYSEXEC libraries are checked).

More Information

For more information about the CONCAT command, the following command can be issued on any Z/OS mainframe:

TSO HELP CONCAT 

CONCAT Examples

CONCATD F(SYSPROC) DA(MY.CLIST)

CLIST example:

ALLOC  DD(MYCLIST) DA(          + 
        '&SYSUID..CLIST'        + 
                 ) SHR     
CONCAT MYCLIST SYSPROC      

REXX example:

/* REXX */ 
"CONCATD FILE(SYSPROC) DSN('MY.CLIST') BEFORE"