llength(1T) Tcl Built-In Commands llength(1T)__________________________________________________________________________________________________________________________________________________NAME
llength - Count the number of elements in a list
SYNOPSIS
llength list
_________________________________________________________________DESCRIPTION
Treats list as a list and returns a decimal string giving the number of elements in it.
EXAMPLES
The result is the number of elements:
% llength {a b c d e}
5
% llength {a b c}
3
% llength {}
0
Elements are not guaranteed to be exactly words in a dictionary sense of course, especially when quoting is used:
% llength {a b {c d} e}
4
% llength {a b { } c d e}
6
An empty list is not necessarily an empty string:
% set var { }; puts "[string length $var],[llength $var]"
1,0
SEE ALSO list(1T), lappend(1T), lindex(1T), linsert(1T), lsearch(1T), lset(1T), lsort(1T), lrange(1T), lreplace(1T) |
KEYWORDS
element, list, length
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Availability | SUNWTcl |
+--------------------+-----------------+
|Interface Stability | Uncommitted |
+--------------------+-----------------+
NOTES
Source for Tcl is available on http://opensolaris.org.
Tclllength(1T)
Check Out this Related Man Page
lrange(n) Tcl Built-In Commands lrange(n)
__________________________________________________________________________________________________________________________________________________NAME
lrange - Return one or more adjacent elements from a list
SYNOPSIS
lrange list first last
_________________________________________________________________DESCRIPTION
List must be a valid Tcl list. This command will return a new list consisting of elements first through last, inclusive. The index values |
first and last are interpreted the same as index values for the command string index, supporting simple index arithmetic and indices rela- |
tive to the end of the list. If first is less than zero, it is treated as if it were zero. If last is greater than or equal to the number
of elements in the list, then it is treated as if it were end. If first is greater than last then an empty string is returned. Note:
"lrange list first first" does not always produce the same result as "lindex list first" (although it often does for simple fields that are
not enclosed in braces); it does, however, produce exactly the same results as "list [lindex list first]"
EXAMPLES
Selecting the first two elements:
% lrange {a b c d e} 0 1
a b
Selecting the last three elements:
% lrange {a b c d e} end-2 end
c d e
Selecting everything except the first and last element:
% lrange {a b c d e} 1 end-1
b c d
Selecting a single element with lrange is not the same as doing so with lindex:
% set var {some {elements to} select}
some {elements to} select
% lindex $var 1
elements to
% lrange $var 1 1
{elements to}
SEE ALSO
list(n), lappend(n), lindex(n), linsert(n), llength(n), lsearch(n), lset(n), lreplace(n), lsort(n), string(n) |
KEYWORDS
element, list, range, sublist
Tcl 7.4 lrange(n)
Hi All
In a script, I want a user to enter 4 characters, these can be a mix of letters (uppercase and lowercase) and numbers.
In this example $var represents what the user has entered.
eg $var can be A9xZ, 3DDL, bbHp .........etc
I need to check that the user has only entered characters... (2 Replies)
Hi,
have a basic query.
Please see the below code:
list="one two three"
for var in $list ; do
echo $var
list="nolist"
Done
Wht if I want to print only first/ last line in the list
Eg one & three
Regards
er_ashu (3 Replies)