--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/changespacetounderscore_readname.py	Wed Apr 01 16:48:58 2015 -0400
@@ -0,0 +1,15 @@
+import sys
+fd=open(sys.argv[1])
+output=open(sys.argv[2],'w')
+columntochange=int(sys.argv[3])-1  # default is 6-1=5
+lines=fd.xreadlines()
+for line in lines:
+	temp=line.strip().split('\t')
+	temp=filter(None,temp)
+	temp2=temp[columntochange].replace(' ','_')
+	product=temp[:columntochange]
+	product.append(temp2)
+	product.extend(temp[columntochange+1:])
+	output.writelines('\t'.join(product)+'\n')
+fd.close()
+output.close()
\ No newline at end of file