= <,> command
.shift out the space on the top/end of line.
shift to the left/right max n byte until space char on the
top/end of line exhausted.
.for margined file,only data in the margin is shifted.
.n of x[n],xx-xx[n] is shift count,default is same as tab count.
tab count is set by TAB command and default is 4.
xn,b.s pattern is not supported.
effect of b,s parameter is same as "(" command.
.space shift out
<< |1234567890ABCDEFG
0002000| 7890ABCDEFG
<< | 4567 DEFG
>> |1234567890A
0005000|12 678
0006000| 34567890ABC
>> |1234567890ABCDEFG
<8 |1234567890ABCDEFG
>3 |1234567890ABCDEFG
<< |1234567890ABCDEFG
0011000|1234567890ABCDEFG
<<2 |1234567890ABCDEFG
>>5 |1234567890ABCDEFG
0014000|1234567890ABCDEFG
>> |1234567890ABCDEFG
===> result for not margined file
<<4 0001000|1234567890ABCDEFG
0002000* 7890ABCDEFG
<<4 0003000*4567 DEFG
>>4 0004000* 1234567890A
0005000* 12 678
0006000* 34567890ABC
>>4 0007000* 1234567890ABCDEFG
<8 0008000|1234567890ABCDEFG
>3 0009000* 1234567890ABCDEFG
<<2 0010000|1234567890ABCDEFG
0011000|1234567890ABCDEFG
<<2 0012000|1234567890ABCDEFG
>>5 0013000* 1234567890ABCDEFG
0014000* 1234567890ABCDEFG
>>5 0015000* 1234567890ABCDEFG
===> result for margined(m15) file
0001000|//*CID://+dateR~:#63 option=(m15,p1,tabclear) update#= 2;
<<4 0002000|1234567890ABCDEFG
0003000* 7890ABCDE FG
<<4 0004000*4567 DE FG
>>4 0005000* 1234567890A
0006000* 12 678
0007000* 34567890ABC
>>4 0008000|1234567890ABCDEFG
<8 0009000|1234567890ABCDEFG
>3 0010000|1234567890ABCDEFG
<<2 0011000|1234567890ABCDEFG
0012000|1234567890ABCDEFG
<<2 0013000|1234567890ABCDEFG
>>5 0014000|1234567890ABCDEFG
0015000|1234567890ABCDEFG
>>5 0016000|1234567890ABCDEFG