代码见下，比较简单，就不再分析了。调用实例见前面的文章。
#************************************************
# get a line from file, skip blank lines and
# comment lines, return the reading line in
# parameter 'line'.
#
# @PARAMS
# fd - file fd
# line - var used to return the line
#
# @RETURN
# return 1 if read successfully, otherwise 0
#************************************************
proc getLine {fd line} {
upvar $line ln
# read a line from fd
while {[set lineLen [gets $fd ln]] >= 0} {
# blank line
if { $lineLen == 0 } continue
# trim whitespace
set ln [string trim $ln]
if { [string length $ln] == 0 } continue
# skip comment
if { [string index $ln 0] == "#" } continue
# success
return 1
}
return 0
}