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Red Hat Linux 9 のミョーな挙動

rindou:eXXXXXX:[78] cat /etc/redhat-release 
Red Hat Linux release 9 (Shrike)
rindou:eXXXXXX:[79] dmesg | head -1
Linux version 2.4.20-8 (bhcompile@porky.devel.redhat.com) (gcc version 3.2.2 200
30222 (Red Hat Linux 3.2.2-5)) #1 Thu Mar 13 17:54:28 EST 2003
rindou:eXXXXXX:[80] echo $?
0
rindou:eXXXXXX:[81] dmesg | head -1 | grep "Red Hat"
Linux version 2.4.20-8 (bhcompile@porky.devel.redhat.com) (gcc version 3.2.2 200
30222 (Red Hat Linux 3.2.2-5)) #1 Thu Mar 13 17:54:28 EST 2003
rindou:eXXXXXX:[82] echo $?
141
rindou:eXXXXXX:[83] dmesg | head -1
Linux version 2.4.20-8 (bhcompile@porky.devel.redhat.com) (gcc version 3.2.2 200
30222 (Red Hat Linux 3.2.2-5)) #1 Thu Mar 13 17:54:28 EST 2003
rindou:eXXXXXX:[84] echo $?
141

シェル (csh) の問題? 0 なのか 141 なのかはっきりしてください。一応、141 が返ってるところでは全て 0 が返るのが正しい動作。