use disk1 mkfs 32 mkdir test1 mkdir test2 la cd test1 la create hello1 mkdir inside symlink ../../test2/ inside/hello3 stat inside/hello3 cd ../test2 la symlink ../test1/inside hello2 stat hello2 cd / cd test1/../test2/hello2/../../test2/.././././test1/inside/hello3/./hello2/. cd .. create inside/././hello3/.././test1/f7 symlink /test1/f7 ../f1 la cd .. la cd test1 open ../test2/hello2/../../f1 write 0 data la close 0 cd / rm test1 rmdir test1 rm test1/inside/hello3 rmdir test1/inside rm test1/hello1 rm test1/f7 rmdir test1 cd test2 la cd hello2 symlink garbage/ttttt .. cd .. la cd ttttt rm ttttt