perforce如何通过命令行修改指定client的root或者view

必须不是通过p4 client弹出的editor文本来修改.也不能在p4的UI修改.
比如
Client: Build_OZAI_APPSV2.0.0.41
Description:
Build client.
Root: f:/APPSV2.0.0.41
View:
//depot/sw/src2/apps/VistaWlan/... //Build_OZAI_APPSV2.0.0.41/sw/src/apps/...
//depot/sw/src2/3rd_Party/Microsoft/VC8/Vista/vcredist_x86.exe //Build_OZAI_APPSV2.0.0.41/sw/src/3rd_Party/vcredist_x86.exe
//depot/sw/src2/3rd_Party/Microsoft/VC8/Vista/vcredist_x64.exe //Build_OZAI_APPSV2.0.0.41/sw/src/3rd_Party/vcredist_x64.exe
//depot/sw/src2/shared/include/oids.h //Build_OZAI_APPSV2.0.0.41/sw/src/shared/include/oids.h


其中的
Root: f:/APPSV2.0.0.41
改成
Root: C:/APPSV2.0.0.41


求告诉帮忙解答!