UNIX for Beginners Questions & Answers

module abcd( a , b , c ,da , fa, na , ta , ma , ra ,
              ta, la , pa );

input a , b, da ,fa , na , ta , ma; 
output c , ra ,ta , 
          la ,pa ;
wire a , b , da , fa ,na ,
        ta , ma;
endmodule

a , b,   da , fa ,na , ta , ma

c , ra ,ta ,la , pa

set chan [open "mod1.v"]
set out [open "output.file.txt" "w"]
set lineNumber 0
# Read until we find the start pattern
while {[gets $chan line] >= 0} {
    incr lineNumber
   puts $line
    if { [string match "input" $line]} {
        # Now read until we find the stop pattern
        while {[gets $chan line] >= 0} {
            incr lineNumber
            if { [string match ";" $line] } {
                close $out
                break
            } else {
                puts $out $line
            }
        }
    }
}
close $chan

a , b,   da , fa ,na , ta , ma
Output list should be

c , ra ,ta ,la , pa

set chan [open "mod1.v"]
set out [open "output.file.txt" "w"]
set lineNumber 0
# Read until we find the start pattern
while {[gets $chan line] >= 0} {
   incr lineNumber
   puts $line
    if { [string match "input*" $line]} {
        # Now read until we find the stop pattern
        while {[gets $chan line] >= 0} {
            incr lineNumber
            # get rid of spaces at front
            regsub {^ *} $line "" line
            # get rid of "output"
            regsub {^output} $line "" line
            if { [string match "*;" $line] } {
                regsub {;.*} $line "" line
                puts $out $line
                close $out
                break
            }
            puts -nonewline $out $line
        }
    }
}
close $chan