I am a newbie to linux actually I was working with android ndk(new to that too) I was wondering if someone can explain the meaning of following commands “ls -l /proc//fd/” and “ls -l /data/data” .
When I run the following command “ls -l /proc//fd/” I got the following output:-
lr-x------ root root 2012-09-07 15:56 4 -> /dev/__properties__ (deleted)
lrwx------ root root 2012-09-07 15:56 5 -> socket:[257]
lrwx------ root root 2012-09-07 15:56 6 -> socket:[259]
lrwx------ root root 2012-09-07 15:56 7 -> socket:[260]
lrwx------ app_4 app_4 2012-09-07 15:56 0 -> /dev/null
lrwx------ app_4 app_4 2012-09-07 15:56 1 -> /dev/null
lrwx------ app_4 app_4 2012-09-07 15:56 2 -> /dev/null
l-wx------ app_4 app_4 2012-09-07 15:56 3 -> /dev/log/main
l-wx------ app_4 app_4 2012-09-07 15:56 4 -> /dev/log/radio
l-wx------ app_4 app_4 2012-09-07 15:56 5 -> /dev/log/events
lr-x------ app_4 app_4 2012-09-07 15:56 6 -> /system/framework/core.jar
lr-x------ app_4 app_4 2012-09-07 15:56 7 -> /system/framework/bouncycastle.jar
lr-x------ app_4 app_4 2012-09-07 15:56 8 -> /dev/__properties__ (deleted)
lrwx------ app_4 app_4 2012-09-07 15:56 9 -> /dev/binder
lr-x------ app_4 app_4 2012-09-07 15:56 10 -> /system/framework/ext.jar
lr-x------ app_4 app_4 2012-09-07 15:56 11 -> /system/framework/framework.jar
lr-x------ app_4 app_4 2012-09-07 15:56 12 -> /system/framework/android.policy.jar
lr-x------ app_4 app_4 2012-09-07 15:56 13 -> /system/framework/services.jar
lr-x------ app_4 app_4 2012-09-07 15:56 14 -> /system/framework/core-junit.jar
lr-x------ app_4 app_4 2012-09-07 15:56 15 -> /system/framework/framework.jar
lr-x------ app_4 app_4 2012-09-07 15:56 16 -> /system/fonts/DroidSans.ttf
lr-x------ app_4 app_4 2012-09-07 15:56 17 -> /system/framework/core.jar
lr-x------ app_4 app_4 2012-09-07 15:56 18 -> /dev/urandom
lr-x------ app_4 app_4 2012-09-07 15:56 19 -> /system/framework/framework-res.apk
l-wx------ app_4 app_4 2012-09-07 15:56 20 -> /dev/cpuctl/tasks
lrwx------ app_4 app_4 2012-09-07 15:56 21 -> socket:[616]
lr-x------ app_4 app_4 2012-09-07 15:56 22 -> pipe:[617]
l-wx------ app_4 app_4 2012-09-07 15:56 23 -> pipe:[617]
lrwx------ app_4 app_4 2012-09-07 15:56 24 -> socket:[620]
l-wx------ app_4 app_4 2012-09-07 15:56 25 -> /dev/cpuctl/bg_non_interactive/tasks
lr-x------ app_4 app_4 2012-09-07 15:56 26 -> pipe:[632]
l-wx------ app_4 app_4 2012-09-07 15:56 27 -> pipe:[632]
lrwx------ app_4 app_4 2012-09-07 15:56 28 -> anon_inode:[eventpoll]
lr-x------ app_4 app_4 2012-09-07 15:56 29 -> /system/app/OpenWnn.apk
lr-x------ app_4 app_4 2012-09-07 15:56 30 -> /system/app/OpenWnn.apk
lrwx------ app_4 app_4 2012-09-07 15:56 31 -> /dev/ashmem
lrwx------ app_4 app_4 2012-09-07 15:56 32 -> /dev/ashmem
lr-x------ app_4 app_4 2012-09-07 15:56 33 -> /system/app/OpenWnn.apk
lrwx------ radio radio 2012-09-07 15:56 0 -> /dev/null
lrwx------ radio radio 2012-09-07 15:56 1 -> /dev/null
lrwx------ radio radio 2012-09-07 15:56 2 -> /dev/null
l-wx------ radio radio 2012-09-07 15:56 3 -> /dev/log/main
l-wx------ radio radio 2012-09-07 15:56 4 -> /dev/log/radio
l-wx------ radio radio 2012-09-07 15:56 5 -> /dev/log/events
lr-x------ radio radio 2012-09-07 15:56 6 -> /system/framework/core.jar
lr-x------ radio radio 2012-09-07 15:56 7 -> /system/framework/bouncycastle.jar
lr-x------ radio radio 2012-09-07 15:56 8 -> /dev/__properties__ (deleted)
lrwx------ radio radio 2012-09-07 15:56 9 -> /dev/binder
lr-x------ radio radio 2012-09-07 15:56 10 -> /system/framework/ext.jar
lr-x------ radio radio 2012-09-07 15:56 11 -> /system/framework/framework.jar
lr-x------ radio radio 2012-09-07 15:56 12 -> /system/framework/android.policy.jar
lr-x------ radio radio 2012-09-07 15:56 13 -> /system/framework/services.jar
lr-x------ radio radio 2012-09-07 15:56 14 -> /system/framework/core-junit.jar
lr-x------ radio radio 2012-09-07 15:56 15 -> /system/framework/framework.jar
lr-x------ radio radio 2012-09-07 15:56 16 -> /system/fonts/DroidSans.ttf
lr-x------ radio radio 2012-09-07 15:56 17 -> /system/framework/core.jar
lr-x------ radio radio 2012-09-07 15:56 18 -> /dev/urandom
lr-x------ radio radio 2012-09-07 15:56 19 -> /system/framework/framework-res.apk
l-wx------ radio radio 2012-09-07 15:56 20 -> /dev/cpuctl/tasks
lrwx------ radio radio 2012-09-07 15:56 21 -> socket:[621]
lr-x------ radio radio 2012-09-07 15:56 22 -> pipe:[622]
l-wx------ radio radio 2012-09-07 15:56 23 -> pipe:[622]
lrwx------ radio radio 2012-09-07 15:56 24 -> socket:[625]
l-wx------ radio radio 2012-09-07 15:56 25 -> /dev/cpuctl/bg_non_interactive/tasks
lr-x------ radio radio 2012-09-07 15:56 26 -> pipe:[638]
l-wx------ radio radio 2012-09-07 15:56 27 -> pipe:[638]
lrwx------ radio radio 2012-09-07 15:56 28 -> anon_inode:[eventpoll]
lr-x------ radio radio 2012-09-07 15:56 29 -> /system/app/Phone.apk
lr-x------ radio radio 2012-09-07 15:56 30 -> /system/app/Phone.apk
lrwx------ radio radio 2012-09-07 15:56 31 -> /dev/ashmem
lrwx------ radio radio 2012-09-07 15:56 32 -> /dev/ashmem
lr-x------ radio radio 2012-09-07 15:56 33 -> /system/app/Phone.apk
lr-x------ radio radio 2012-09-07 15:56 34 -> /system/app/TelephonyProvider.apk
lr-x------ radio radio 2012-09-07 15:56 35 -> /system/app/TelephonyProvider.apk
lr-x------ radio radio 2012-09-07 15:56 36 -> /system/app/TelephonyProvider.apk
lrwx------ radio radio 2012-09-07 15:56 37 -> /data/data/com.android.providers.telephony/databases/telephony.db
lr-x------ radio radio 2012-09-07 15:56 38 -> pipe:[730]
l-wx------ radio radio 2012-09-07 15:56 39 -> pipe:[730]
lrwx------ radio radio 2012-09-07 15:56 40 -> anon_inode:[eventpoll]
lrwx------ radio radio 2012-09-07 15:56 41 -> socket:[731]
lr-x------ radio radio 2012-09-07 15:56 42 -> pipe:[750]
l-wx------ radio radio 2012-09-07 15:56 43 -> pipe:[750]
lrwx------ radio radio 2012-09-07 15:56 44 -> anon_inode:[eventpoll]
lr-x------ radio radio 2012-09-07 15:56 45 -> pipe:[753]
l-wx------ radio radio 2012-09-07 15:56 46 -> pipe:[753]
lrwx------ radio radio 2012-09-07 15:56 47 -> anon_inode:[eventpoll]
lr-x------ radio radio 2012-09-07 15:56 48 -> pipe:[754]
l-wx------ radio radio 2012-09-07 15:56 49 -> pipe:[754]
lrwx------ radio radio 2012-09-07 15:56 50 -> anon_inode:[eventpoll]
lr-x------ radio radio 2012-09-07 15:56 51 -> pipe:[756]
l-wx------ radio radio 2012-09-07 15:56 52 -> pipe:[756]
lrwx------ radio radio 2012-09-07 15:56 53 -> anon_inode:[eventpoll]
lr-x------ radio radio 2012-09-07 15:56 54 -> pipe:[762]
and when I ran the “ls -l /data/data” command I got the following output :-
drwxr-x--x system system 2012-08-10 17:07 com.android.providers.set
tings
drwxr-x--x system system 2012-08-10 17:07 com.android.settings
drwxr-x--x app_13 app_13 2012-08-10 17:07 com.android.launcher
drwxr-x--x app_6 app_6 2012-08-10 17:07 com.android.providers.con
tacts
drwxr-x--x system system 2012-08-10 17:07 com.android.providers.sub
scribedfeeds
drwxr-x--x app_0 app_0 2012-08-10 17:07 com.android.providers.drm
drwxr-x--x app_14 app_14 2012-08-10 17:07 com.android.customlocale
drwxr-x--x app_16 app_16 2012-08-10 17:07 com.android.spare_parts
drwxr-x--x app_17 app_17 2012-08-10 17:07 com.android.speechrecorde
r
drwxr-x--x app_18 app_18 2012-08-10 17:07 com.android.term
drwxr-x--x app_0 app_0 2012-08-10 17:08 com.android.providers.dow
nloads
drwxr-x--x app_19 app_19 2012-08-10 17:08 com.android.deskclock
drwxr-x--x app_28 app_28 2012-08-10 17:08 com.android.email
drwxr-x--x app_0 app_0 2012-08-10 17:08 com.android.providers.med
ia
drwxr-x--x app_4 app_4 2012-08-10 19:57 jp.co.omronsoft.openwnn
drwxr-x--x app_6 app_6 2012-08-13 14:54 com.android.providers.use
rdictionary
drwxr-x--x radio radio 2012-08-10 17:07 com.android.providers.tel
ephony
drwxr-x--x app_20 app_20 2012-08-28 19:29 com.android.browser
drwxr-x--x app_21 app_21 2012-08-10 17:07 com.android.packageinstal
ler
drwxr-x--x app_22 app_22 2012-08-10 17:07 com.android.certinstaller
drwxr-x--x app_23 app_23 2012-08-10 17:07 com.android.netspeed
drwxr-x--x system system 2012-08-10 17:07 com.android.systemui
drwxr-x--x app_24 app_24 2012-08-10 17:07 com.android.protips
drwxr-x--x app_25 app_25 2012-08-10 17:07 com.android.camera
drwxr-x--x app_26 app_26 2012-08-10 17:07 com.android.sdksetup
drwxr-x--x app_27 app_27 2012-08-10 17:07 com.android.calculator2
drwxr-x--x app_29 app_29 2012-08-10 17:07 com.android.development
drwxr-x--x app_1 app_1 2012-08-10 17:07 com.android.htmlviewer
drwxr-x--x app_3 app_3 2012-08-10 17:07 com.android.defcontainer
drwxr-x--x system system 2012-08-10 17:07 com.android.server.vpn
drwxr-x--x app_5 app_5 2012-08-10 17:07 com.android.music
drwxr-x--x app_6 app_6 2012-08-10 17:07 com.android.providers.app
lications
drwxr-x--x app_7 app_7 2012-08-10 17:07 com.android.wallpaper.liv
epicker
drwxr-x--x app_8 app_8 2012-08-10 17:07 com.android.fallback
drwxr-x--x app_9 app_9 2012-08-10 17:07 com.svox.pico
drwxr-x--x app_10 app_10 2012-08-10 17:07 com.android.inputmethod.l
atin
drwxr-x--x app_11 app_11 2012-08-10 17:07 android.tts
drwxr-x--x app_12 app_12 2012-08-10 17:07 com.android.soundrecorder
drwxr-x--x app_6 app_6 2012-08-10 17:07 com.android.inputmethod.p
inyin
drwxr-x--x app_0 app_0 2012-08-10 17:07 com.android.providers.dow
nloads.ui
drwxr-x--x app_0 app_0 2012-08-10 17:07 com.android.gallery
drwxr-x--x app_15 app_15 2012-08-10 17:08 com.android.mms
drwxr-x--x app_34 app_34 2012-09-07 15:55 com.hawkagentmain
drwxr-x--x app_35 app_35 2012-09-07 15:55 com.SampleDumpsys.Activit
y
drwxr-x--x app_30 app_30 2012-09-07 15:55 com.android.gesture.build
er
drwxr-x--x app_31 app_31 2012-09-07 15:55 com.example.android.softk
eyboard
drwxr-x--x app_32 app_32 2012-09-07 15:55 com.example.android.livec
ubes
drwxr-x--x app_33 app_33 2012-09-07 15:55 com.example.android.apis
drwxr-x--x app_6 app_6 2012-09-06 20:47 com.android.contacts
drwxr-x--x app_2 app_2 2012-09-06 20:47 com.android.quicksearchbo
x
drwxr-x--x radio radio 2012-09-06 20:47 com.android.phone
Can anyone tell what these outputs tell?
I will be very thank full to you.
ls -s /data/datashows directories and files in /data/data directory with owner name (for instance, app_30), group name (app_30, owner name and group name are equal) and permissions assigned to folders (drwxr-x–x). This directory contains private data of installed android applications./proc/<proc_id>/fdshows opened descriptors of the process with PID equal to proc_id.