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387691,387710,387720,387817,387922,388067, 如何搞掉最后一个,

sed 's/.$//' 

awk '{sub(/.$/,"")}1' 

[root@localhost adminshell]# echo "387691,387710,387720,387817,387922,388067," |sed 's/.$//'  
387691,387710,387720,387817,387922,388067  
[root@localhost adminshell]# echo "387691,387710,387720,387817,387922,388067," | awk '{sub(/.$/,"")}1'  
387691,387710,387720,387817,387922,388067  
[root@localhost adminshell]# echo "387691,387710,387720,387817,387922,388067," | awk '{printf $0"\b \n"}'  
387691,387710,387720,387817,387922,388067  （#会多出一个空格）