Trimming spaces from a variable


 
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Old 12-13-2011
Trimming spaces from a variable

Hi guys,
when I take substring of a particular data using this command
var=substr($0,11,10)
it comes with spaces, when I am trying to trim the spaces it is not allowing me to do that.
Can you please help me out on that.
As I have to reverse the output of the variable also.

---------- Post updated at 07:50 AM ---------- Previous update was at 07:46 AM ----------

a=substr($0,11,10)
a1=`echo "${a}" | sed 's/ *$//'`

then it give me this error
The error context is
>>> a1=` <<<

Last edited by Scott; 12-13-2011 at 08:57 AM.. Reason: Duplicate post - Closed
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lappend(3tcl)						       Tcl Built-In Commands						     lappend(3tcl)

__________________________________________________________________________________________________________________________________________________

NAME
lappend - Append list elements onto a variable SYNOPSIS
lappend varName ?value value value ...? _________________________________________________________________ DESCRIPTION
This command treats the variable given by varName as a list and appends each of the value arguments to that list as a separate element, with spaces between elements. If varName does not exist, it is created as a list with elements given by the value arguments. Lappend is similar to append except that the values are appended as list elements rather than raw text. This command provides a relatively efficient way to build up large lists. For example, "lappend a $b" is much more efficient than "set a [concat $a [list $b]]" when $a is long. EXAMPLE
Using lappend to build up a list of numbers. % set var 1 1 % lappend var 2 1 2 % lappend var 3 4 5 1 2 3 4 5 SEE ALSO
list(3tcl), lindex(3tcl), linsert(3tcl), llength(3tcl), lset(3tcl), lsort(3tcl), lrange(3tcl) KEYWORDS
append, element, list, variable Tcl lappend(3tcl)