linux ls permission denied,permission denied这是什么意思？肿么破？
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app_49@localhost / $ export PATH=/system/usr/local/arm/4.3.2/bin:/system/usr/bin:/data/local/bin:$PATH
app_49@localhost / $ su
# cd /system/usr/bin
# chmod a+x nasm
# ls -l
----rwxr-x 1 system sdcard_r 32096 Mar 3 23:55 ldrdf
---xrwxr-x 1 system sdcard_r 524020 Mar 3 23:55 nasm
----rwxr-x 1 system sdcard_r 261268 Mar 3 23:55 ndisasm
----rwxr-x 1 system sdcard_r 22892 Mar 3 23:55 rdf2bin
----rwxr-x 1 system sdcard_r 7 Mar 3 23:55 rdf2com
----rwxr-x 1 system sdcard_r 7 Mar 3 23:55 rdf2ihx
----rwxr-x 1 system sdcard_r 7 Mar 3 23:55 rdf2ith
----rwxr-x 1 system sdcard_r 7 Mar 3 23:55 rdf2srec
----rwxr-x 1 system sdcard_r 13424 Mar 3 23:55 rdfdump
----rwxr-x 1 system sdcard_r 7316 Mar 3 23:55 rdflib
----rwxr-x 1 system sdcard_r 11916 Mar 3 23:55 rdx
# ./nasm
./nasm: not found
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