grep and -

[zhaoyj]

something wrong with "-"?????

my OS : redhat fedora 2

address@hidden root]# grep -V
grep (GNU grep) 2.5.1

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address@hidden root]# cat test
dtedd:sdfasd
dtedd-3:sdaf
dtedd-9:sdf
dtedd-323:asdf
address@hidden root]# grep "dtedd" test
dtedd:sdfasd
dtedd-3:sdaf
dtedd-9:sdf
dtedd-323:asdf
address@hidden root]# grep -w "dtedd" test
dtedd:sdfasd
dtedd-3:sdaf
dtedd-9:sdf
dtedd-323:asdf
address@hidden root]# grep -w 'dtedd' test
dtedd:sdfasd
dtedd-3:sdaf
dtedd-9:sdf
dtedd-323:asdf
address@hidden root]#