wc can not count correctly

[wyoming]

i write a file name usertest as follows,

#!/bin/sh
cnt=`ps -elf | grep usertest | grep -v grep | wc -l`
echo $cnt

every time i run it, the number it shows bigger that 2.
but if i change the file into

#!/bin/sh
ps -elf | grep usertest | grep -v grep | wc -l

it just show ONE line.

i try the same process in IRIX, it works well. i do not know why!!!






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