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list(1) [centos man page]

list(n) 						       Tcl Built-In Commands							   list(n)


list - Create a list SYNOPSIS
list ?arg arg ...? _________________________________________________________________ DESCRIPTION
This command returns a list comprised of all the args, or an empty string if no args are specified. Braces and backslashes get added as necessary, so that the lindex command may be used on the result to re-extract the original arguments, and also so that eval may be used to execute the resulting list, with arg1 comprising the command's name and the other args comprising its arguments. List produces slightly different results than concat: concat removes one level of grouping before forming the list, while list works directly from the original arguments. EXAMPLE
The command list a b "c d e " " f {g h}" will return a b {c d e } { f {g h}} while concat with the same arguments will return a b c d e f {g h} SEE ALSO
lappend(n), lindex(n), linsert(n), llength(n), lrange(n), lrepeat(n), lreplace(n), lsearch(n), lset(n), lsort(n) | KEYWORDS
element, list Tcl list(n)

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lindex(n)						       Tcl Built-In Commands							 lindex(n)


lindex - Retrieve an element from a list SYNOPSIS
lindex list ?index...? _________________________________________________________________ DESCRIPTION
The lindex command accepts a parameter, list, which it treats as a Tcl list. It also accepts zero or more indices into the list. The indices may be presented either consecutively on the command line, or grouped in a Tcl list and presented as a single argument. If no indices are presented, the command takes the form: lindex list or lindex list {} In this case, the return value of lindex is simply the value of the list parameter. When presented with a single index, the lindex command treats list as a Tcl list and returns the index'th element from it (0 refers to the first element of the list). In extracting the element, lindex observes the same rules concerning braces and quotes and backslashes as the Tcl command interpreter; however, variable substitution and command substitution do not occur. If index is negative or greater than or equal to the number of elements in value, then an empty string is returned. The interpretation of each simple index value is the same as | for the command string index, supporting simple index arithmetic and indices relative to the end of the list. If additional index arguments are supplied, then each argument is used in turn to select an element from the previous indexing operation, allowing the script to select elements from sublists. The command, lindex $a 1 2 3 or lindex $a {1 2 3} is synonymous with lindex [lindex [lindex $a 1] 2] 3 EXAMPLES
lindex {a b c} -> a b c lindex {a b c} {} -> a b c lindex {a b c} 0 -> a lindex {a b c} 2 -> c lindex {a b c} end -> c lindex {a b c} end-1 -> b lindex {{a b c} {d e f} {g h i}} 2 1 -> h lindex {{a b c} {d e f} {g h i}} {2 1} -> h lindex {{{a b} {c d}} {{e f} {g h}}} 1 1 0 -> g lindex {{{a b} {c d}} {{e f} {g h}}} {1 1 0} -> g SEE ALSO
list(n), lappend(n), linsert(n), llength(n), lsearch(n), lset(n), lsort(n), lrange(n), lreplace(n), string(n) | KEYWORDS
element, index, list Tcl 8.4 lindex(n)

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