Re: question about uefi shell pipe.

[krishnaLee <sssky307@163.com>]

Hi,All:
may be I should reply this to EDK2 group,sorry for this mail-size>600K,I had trim the picture and attached my file again,and send it again.


After many test,my right key of "ls | grep -trim-last 0 | grep -trim-last 0" is:
  1,before pipe out the buffer,trim off all in-visible wchars at end of this buffer, (the trimed of wchar  is "like ASCII's range of" 0x0000~0x0020. )
  2,always make sure outputBuffer[lastTwoWchar] = { 0x000A,0x000D },it will also bypass many other strange result.


thank you,
by krishna.





At 2018-07-06 11:07:05, "krishnaLee" <sssky307@163.com> wrote:

Jim,
I attached the smalltest.efi if you have not compiled the test code.


I am in developing of  this grep.efi tool,I can now bypass the test-1 question by follow command:
ls | grep -trim-last 0
ls | grep -trim-last 0 | grep -trim-last 0


I also attached this grep.efi  tool, it almost ok :)


//draft usage guide-------------------------------------------------


//if find ok,returncode 1,Print(string);else returncode 0;
grep.efi -find string


//get first word,
//the front and the end in-visible chars of this word will be trimed off;
grep.efi -first


//get back part after the string.

grep.efi -begin-at string


//get front part before the string
grep.efi -end-at string


//trim off first n chars at front
//before start -trim-first,the front in-visible chars will be trimed off;
grep.efi -trim-first n


//trim off back n chars at end,
//before start -trim-last,the end in-visible chars will be trimed off;
grep.efi -trim-last n


//trim off whitespace at front and end,
//trim off in-visible chars infact;
grep.efi -trim-space




thank you,
by krishna.