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man pages section 1: User Commands

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Updated: Wednesday, February 10, 2021

linsert (1t)


linsert - Insert elements into a list


linsert list index ?element element ...?


linsert(1t)                  Tcl Built-In Commands                 linsert(1t)


       linsert - Insert elements into a list

       linsert list index ?element element ...?

       This command produces a new list from list by inserting all of the ele-
       ment arguments just before the index'th element of list.  Each  element
       argument  will  become a separate element of the new list.  If index is
       less than or equal to zero, then the new elements are inserted  at  the
       beginning  of  the list, and if index is greater or equal to the length
       of list, it is as if it was end.  As with string index, the index value
       supports both simple index arithmetic and end-relative indexing.

       Subject to the restrictions that indices must refer to locations inside
       the list and that the elements will always be inserted in order, inser-
       tions  are done so that when index is start-relative, the first element
       will be at that index in the resulting list, and when index is end-rel-
       ative, the last element will be at that index in the resulting list.

       Putting some values into a list, first indexing from the start and then
       indexing from the end, and then chaining them together:

              set oldList {the fox jumps over the dog}
              set midList [linsert $oldList 1 quick]
              set newList [linsert $midList end-1 lazy]
              # The old lists still exist though...
              set newerList [linsert [linsert $oldList end-1 quick] 1 lazy]

       See attributes(7) for descriptions of the following attributes:

       |Availability   | runtime/tcl-8    |
       |Stability      | Uncommitted      |
       list(n),  lappend(n),  lindex(n),  llength(n),   lsearch(n),   lset(n),
       lsort(n), lrange(n), lreplace(n), string(n)

       element, insert, list

       This     software     was    built    from    source    available    at
       https://github.com/oracle/solaris-userland.   The  original   community
       source was downloaded from  http://prdownloads.sourceforge.net/tcl/tcl-

       Further information about this software can be found on the open source
       community website at https://www.tcl.tk/.

Tcl                                   8.2                          linsert(1t)