UNIX and Linux Applications

cat work.txt

Code:

M|324324|32424|3431
M|324324|32424|3431
N|324324|32426|3432
N|324324|32424|3434
M|324324|32424|3435

Code:

cat work.txt | tee $( grep '^M' > m.txt ) | $( grep '^N' > n.txt )

Code:

cehpny00:/home01/sr38632 $ cat m.txt
M|324324|32424|3431
M|324324|32424|3431
M|324324|32424|3435

Code:

cehpny00:/home01/sr38632 $ cat n.txt
no results.

Why grep '^N' not working. pls help me.

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