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#!/bin/sh # the next line restarts using tclsh \ exec tclsh "$0" "$@" package require -exact Gnocl 3.24 set str "\tAbc def ghi klm a. \tYes! " ## reduce multiple spaces within a string but retain \t, trim all external spaces. # args: str string to modify # returns: updated string # proc removeSpaces { str } { while 1 { if { [string first " " $str] == -1 } { break } set str [string map [list " " " "] $str] } return [string trim $str " "] } puts >[removeSpaces $str]<