Lists in TCL scripting

 LISTS keywords and It's Usage 

lindex

lindex is a keyword and it will print the index value of the list.

Example:

   set  NameList  "Naresh Prashanth Sanjeev Manoj  Rajendhar"

   puts [lindex $NameList 0] ; #it will print the 0th index of NameList i,e Naresh

   puts [lindex $NameList 1] 

   puts [lindex $NameList 2] 

         

Explanation:

List index will start from "0" 

Naresh    -----> index 0

Prashanth  ---> index 1

Sanjeev     ---> index 2

Manoj      ----> index 3

Rajendhar ---> index 4

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llength

llength is a keyword -it will give you the size of the list.

Example:           

  set  NameList  "Naresh Prashanth  Sanjeev Manoj Rajendhar"

  puts [lindex   $NameList 0] 

  puts [llength  $NameList ] ; #it will print 5 because 5 Names are there in the NameList  

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lsort

lsort is a keyword -it will sort the list means ascending/Descending order of the List      

Example1:

 set  NumList  "0  9 8 1 3 4"

 puts [lsort $NumList  -ascending ] ; # it will print from small to big

 puts [lsort $NumList  -descending ] ; # it will print from big to small 

 Explanation 1:

 In this example I am taking numerical values     

 Ascending values --> small to big like 0 1 3 4 8 9

 Descending values --> big to small like 9 8 4 3 1 0

Example2:         

 set flist  "Banana Anar Avagado Watermelon Grapes Mango "

 puts [lsort $flist] ; # it will print in alphabetical order

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lsearch

lsearch is a keyword to search for the element if it is matches it will return 0 otherwise it will return -1 

Example:

    set str "Nag Raju Chandu Mahi"

    lsearch $str Nag

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