我有以下目录结构：
nchambers@nchambers-305E4A-305E5A-305E7A:~/mini-bin$ la
2to3 cpp-5.3.0 gcov-5.3.0 grmid-5.3.0 objcopy-2.25.1 python3.5-config .sources
2to3-3.5 elfedit-2.25.1 gcov-tool-5.3.0 grmiregistry-5.3.0 objdump-2.25.1 python3.5m strings-2.25.1
addr2line-2.25.1 g++-5.3.0 gfortran-5.3.0 gserialver-5.3.0 pydoc python3.5m-config strip-2.25.1
aot-compile-5.3.0 gappletviewer-5.3.0 gij-5.3.0 gtnameserv-5.3.0 pydoc3 python3-config x86_64-unknown-linux-gnu-c++-5.3.0
ar-2.25.1 gc-analyze-5.3.0 gjar-5.3.0 idle pydoc3.5 python-config x86_64-unknown-linux-gnu-g++-5.3.0
.archives gcc-5.3.0 gjarsigner-5.3.0 idle3 python pyvenv x86_64-unknown-linux-gnu-gcc-5.3.0
as-2.25.1 gcc-ar-5.3.0 gjavah-5.3.0 idle3.5 python2 pyvenv-3.5 x86_64-unknown-linux-gnu-gcc-ar-5.3.0
bash gcc-nm-5.3.0 gkeytool-5.3.0 jcf-dump-5.3.0 python2.7 ranlib-2.25.1 x86_64-unknown-linux-gnu-gcc-nm-5.3.0
.binaries gcc-ranlib-5.3.0 gnative2ascii-5.3.0 jv-convert-5.3.0 python2.7-config readelf-2.25.1 x86_64-unknown-linux-gnu-gcc-ranlib-5.3.0
.build gcj-5.3.0 gorbd-5.3.0 ld-2.25.1 python2-config rebuild-gcj-db-5.3.0 x86_64-unknown-linux-gnu-gcj-5.3.0
c++-5.3.0 gcj-dbtool-5.3.0 gprof-2.25.1 ld.bfd-2.25.1 python3 size-2.25.1 x86_64-unknown-linux-gnu-gfortran-5.3.0 …