Shell Programming and Scripting

When I print (cat) my log file, the following shows up

[00:15:09 17/11/2006] Executing sftp ...
sftp> lcd /home/abc
/home/abc
sftp> put test.xml
test.xml | 20MB | 620kB/s | TOC: 00:00:33 | 100%
sftp> quit
[00:15:46 17/11/2006] test.xml transferred

then I try to grep "100%" from this file where I got "grep: 0652-226 Maximum line length of 2048 exceeded."
So I did a "cat -v" on my log file which give me

[00:15:09 17/11/2006] Executing sftp ...
sftp> lcd /home/abc^M
/home/abc^M
sftp> put test.xml^M
^Mtest.xml | 576kB | 576kB/s | ETA: 00:00:34 | 2%^Mtest.xml | 960kB | 480kB/s | ETA: 00:00:40 | 4%^Mtest.xml | 1.4MB | 480kB/s | ETA: 00:00:39 | 7%^Mtest.xml | 1.9MB | 480kB/s | ETA: 00:00:38 | 9%^Mtest.xml | 2.4MB | 486kB/s | ETA: 00:00:37 | 11%^Mtest.xml | 2.8MB | 485kB/s | ETA: 00:00:36 | 14%^Mtest.xml | 3.3MB | 485kB/s | ETA: 00:00:35 | 16%^Mtest.xml | 3.8MB | 480kB/s | ETA: 00:00:34 | 18%^Mtest.xml | 4.2MB | 480kB/s | ETA: 00:00:33 | 21%^Mtest.xml | 4.7MB | 480kB/s | ETA: 00:00:32 | 23%^Mtest.xml | 5.1MB | 477kB/s | ETA: 00:00:31 | 25%^Mtest.xml | 5.6MB | 480kB/s | ETA: 00:00:30 | 28%^Mtest.xml | 6.1MB | 480kB/s | ETA: 00:00:29 | 30%^Mtest.xml | 6.5MB | 475kB/s | ETA: 00:00:29 | 32%^Mtest.xml | 6.9MB | 469kB/s | ETA: 00:00:28 | 34%^Mtest.xml | 7.3MB | 470kB/s | ETA: 00:00:27 | 36%^Mtest.xml | 7.8MB | 471kB/s | ETA: 00:00:26 | 39%^Mtest.xml | 8.3MB | 471kB/s | ETA: 00:00:25 | 41%^Mtest.xml | 8.9MB | 478kB/s | ETA: 00:00:23 | 44%^Mtest.xml | 9.4MB | 482kB/s | ETA: 00:00:22 | 47%^Mtest.xml | 10MB | 486kB/s | ETA: 00:00:21 | 49%^Mtest.xml | 11MB | 492kB/s | ETA: 00:00:19 | 52%^Mtest.xml | 11MB | 498kB/s | ETA: 00:00:18 | 56%^Mtest.xml | 12MB | 509kB/s | ETA: 00:00:16 | 59%^Mtest.xml | 13MB | 521kB/s | ETA: 00:00:14 | 63%^Mtest.xml | 14MB | 537kB/s | ETA: 00:00:12 | 68%^Mtest.xml | 14MB | 548kB/s | ETA: 00:00:10 | 72%^Mtest.xml | 15MB | 561kB/s | ETA: 00:00:08 | 76%^Mtest.xml | 16MB | 570kB/s | ETA: 00:00:06 | 80%^Mtest.xml | 17MB | 578kB/s | ETA: 00:00:05 | 84%^Mtest.xml | 18MB | 588kB/s | ETA: 00:00:03 | 89%^Mtest.xml | 19MB | 597kB/s | ETA: 00:00:02 | 93%^Mtest.xml | 19MB | 603kB/s | ETA: 00:00:00 | 97%^Mtest.xml | 20MB | 620kB/s | TOC: 00:00:33 | 100%^M
sftp> quit^M
[00:15:46 17/11/2006] test.xml transferred

what I want to do is to verify whether the file is transferred successfully, hence "grep 100%", but it seems that there are many hidden messages which cause error, can anyone tell me whether I can remove these hidden messages? or is there any other way to verify?

How about using scp instead of sftp? It should work anywhere sftp works, and you can just check it's return value instead of processing a logfile.