ls（list directory contents）
1|rk356x_box:/ # ls --help
usage: ls [-ACFHLRSZacdfhiklmnpqrstuwx1] [--color[=auto]] [FILE...]
List files.
what to show:
-a all files including .hidden -b escape nongraphic chars
-c use ctime for timestamps -d directory, not contents
-i inode number -p put a '/' after dir names
-q unprintable chars as '?' -s storage used (1024 byte units)
-u use access time for timestamps -A list all files but . and ..
-H follow command line symlinks -L follow symlinks
-R recursively list in subdirs -F append /dir *exe @sym |FIFO
-Z security context
output formats:
-1 list one file per line -C columns (sorted vertically)
-g like -l but no owner -h human readable sizes
-l long (show full details) -m comma separated
-n like -l but numeric uid/gid -o like -l but no group
-w set column width -x columns (horizontal sort)
-ll long with nanoseconds (--full-time)
--color device=yellow symlink=turquoise/red dir=blue socket=purple
files: exe=green suid=red suidfile=redback stickydir=greenback
=auto means detect if output is a tty.
sorting (default is alphabetical):
-f unsorted -r reverse -t timestamp -S size
example：
rk356x_box:/sdcard/Android/data/com.sundray.meeting # ls -lsh
total 10M
10M -rw-r----- 1 root ext_data_rw 20M 2023-03-17 15:14 BJCastChannel_1673923040340.h264
2.0K drwxrws--- 2 system ext_data_rw 4.0K 2023-02-21 11:44 cache
2.0K drwx--S--- 3 system ext_data_rw 4.0K 2023-03-17 14:56 files
df（disk free）
显示指定磁盘文件的使用情况。如果没有指定文件，则显示所有挂载的文件系统的磁盘使用情况。
rk356x_box:/ # df --help
usage: df [-HPkhi] [-t type] [FILE...]
The "disk free" command shows total/used/available disk space for
each filesystem listed on the command line, or all currently mounted
filesystems.
-a Show all (including /proc and friends)
-P The SUSv3 "Pedantic" option
-k Sets units back to 1024 bytes (the default without -P)
-h Human readable (K=1024)
-H Human readable (k=1000)
-i Show inodes instead of blocks
-t type Display only filesystems of this type
Pedantic provides a slightly less useful output format dictated by Posix,
and sets the units to 512 bytes instead of the default 1024 bytes.
使用
rk356x_box:/ # df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 1.8G 832K 1.8G 1% /dev
tmpfs 1.8G 0 1.8G 0% /mnt
/dev/block/mmcblk2p15 11M 104K 11M 1% /metadata
/dev/block/dm-0 1.2G 1.1G 99M 92% /
/dev/block/dm-2 426M 424M 1.2M 100% /vendor
/dev/block/dm-4 600K 596K 4.0K 100% /odm
/dev/block/dm-3 140M 140M 432K 100% /product
/dev/block/dm-1 51M 51M 160K 100% /system_ext
tmpfs 1.8G 0 1.8G 0% /apex
tmpfs 1.8G 264K 1.8G 1% /linkerconfig
/dev/block/mmcblk2p14 1.9G 300K 1.9G 1% /cache
/dev/block/mmcblk2p16 122M 31M 91M 26% /sundrayconfig
/dev/block/mmcblk2p20 6.5G 1.2G 5.2G 20% /data
tmpfs 1.8G 0 1.8G 0% /data_mirror
/dev/fuse 6.5G 1.2G 5.2G 20% /mnt/user/0/emulated
du（disk usage）
rk356x_box:/ # du --help
usage: du [-d N] [-askxHLlmc] [FILE...]
Show disk usage, space consumed by files and directories.
Size in:
-k 1024 byte blocks (default)
-K 512 byte blocks (posix)
-m Megabytes
-h Human readable (e.g., 1K 243M 2G)
What to show:
-a All files, not just directories
-H Follow symlinks on cmdline
-L Follow all symlinks
-s Only total size of each argument
-x Don't leave this filesystem
-c Cumulative total
-d N Only depth < N
-l Disable hardlink filter
exaple：
rk356x_box:/sdcard/Android/data # du -sh ./*
8.0K ./com.rockchips.mediacenter
20M ./com.sundray.meeting
12K ./com.sundray.meeting.device.test
kernel
查看内核版本
uname -a
读取内核镜像
cd /data; dd if=/dev/block/mmcblk2p11 of=boot_a.img
写入内核镜像
dd if=boot_a.img of=/dev/block/mmcblk2p11
驱动
lsmod：显示已载入系统的模块
rk356x_box:/ $ lsmod
Module Size Used by
88x2cs 3174400 0
wlan 11153408 0
wlan_cnss_core_pcie 319488 1 wlan
insmod（install module）：载入模块
install module
rmmod（remove module）：删除模块
rmmod
dmesg
rk356x_box:/ $ dmesg --help
usage: dmesg [-Cc] [-r|-t|-T] [-n LEVEL] [-s SIZE] [-w]
Print or control the kernel ring buffer.
-C Clear ring buffer without printing
-c Clear ring buffer after printing
-n Set kernel logging LEVEL (1-9)
-r Raw output (with )
-S Use syslog(2) rather than /dev/kmsg
-s Show the last SIZE many bytes
-T Human readable timestamps
-t Don't print timestamps
-w Keep waiting for more output (aka --follow)
// 清空dmesg的日志
dmesg -c
dmesg -w > /data/dmesg.log &
// 时间
dmesg -w -T > /data/dmesg.log &
查看占用率
dmc占用率
cat /sys/class/devfreq/dmc/load
GPU占用率
cat /sys/class/devfreq/fde60000.gpu/load
ip
255|rk356x_box:/ # ip
``` java
255|rk356x_box:/ # ip
Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }
ip [ -force ] -batch filename
where OBJECT := { link | address | addrlabel | route | rule | neigh | ntable |
tunnel | tuntap | maddress | mroute | mrule | monitor | xfrm |
netns | l2tp | fou | macsec | tcp_metrics | token | netconf | ila |
vrf | sr }
OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |
-h[uman-readable] | -iec |
-f[amily] { inet | inet6 | ipx | dnet | mpls | bridge | link } |
-4 | -6 | -I | -D | -B | -0 |
-l[oops] { maximum-addr-flush-attempts } | -br[ief] |
-o[neline] | -t[imestamp] | -ts[hort] | -b[atch] [filename] |
-rc[vbuf] [size] | -n[etns] name | -a[ll] | -c[olor]}
example:
``
ip neigh
## Android
查看SurfaceFliger的帧率
`logcat | grep mFps`