Published Book on Amazon
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All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 1 |
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All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 2 |
출판된 한글판 도서
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최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (상) |
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최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (하) |
Original Book Contents
19.3.2 Checking System Information in "/proc" Folder
The status information about the system as a whole is included below the "/proc" folder.
19.3.2.1 Information about CPU and Memory
In the "/proc" folder, you can see the CPU and memory related information for the entire system.
The following is checking the contents of "/proc/meminfo". This shows the overall state of the memory. If you check the contents of the file again after a while, you can see that the contents have been changed. This means that the contents of this file have been automatically changed because the state of memory usage has been changed as the state of the system is changed.
| MemTotal: 380780 kB MemFree: 19768 kB MemAvailable: 205052 kB Buffers: 28956 kB Cached: 175456 kB SwapCached: 4 kB Active: 185464 kB Inactive: 140352 kB Active(anon): 64036 kB Inactive(anon): 61900 kB Active(file): 121428 kB Inactive(file): 78452 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 102396 kB SwapFree: 102392 kB Dirty: 0 kB Writeback: 0 kB AnonPages: 121412 kB Mapped: 79280 kB Shmem: 4536 kB Slab: 18480 kB SReclaimable: 11764 kB SUnreclaim: 6716 kB KernelStack: 2040 kB PageTables: 4100 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 292784 kB Committed_AS: 1052716 kB VmallocTotal: 630784 kB VmallocUsed: 2108 kB VmallocChunk: 384300 kB |
The following is checking the contents of the "/proc/cpuinfo" file. This contains information about the CPU.
| processor : 0 model name : ARMv6-compatible processor rev 7 (v6l) BogoMIPS : 2.00 Features : half thumb fastmult vfp edsp java tls CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x0 CPU part : 0xb76 CPU revision : 7
Hardware : BCM2708 Revision : 0010 Serial : 0000000053e2c74b |
The following is checking the contents of the "/proc/version" file. It contains Linux version information.
| Linux version 3.18.11+ (dc4@dc4-XPS13-9333) (gcc version 4.8.3 20140303 (prerelease) (crosstool-NG linaro-1.13.1+bzr2650 - Linaro GCC 2014.03) ) #781 PREEMPT Tue Apr 21 18:02:18 BST 2015 |
19.3.2.2 Information about File System
In "/proc", you can see information about the entire file system of the system.
The following is checking the contents of "/proc/filesystems". This shows the type of file system supported by the current system.
| nodev sysfs nodev rootfs nodev ramfs nodev bdev nodev proc nodev cgroup nodev tmpfs nodev devtmpfs nodev debugfs nodev sockfs nodev pipefs nodev rpc_pipefs nodev configfs nodev devpts ext3 ext2 ext4 vfat msdos nodev nfs nodev nfs4 nodev autofs f2fs nodev mqueue ntfs |
The following is checking the contents of "/proc/partitions". This is information about currently installed disks and partitions. When you run "fdisk –l" command, you will see the same disks and partitions displayed.
| major minor #blocks name
179 0 15558144 mmcblk0 179 1 832818 mmcblk0p1 179 2 1 mmcblk0p2 179 3 32768 mmcblk0p3 179 5 61440 mmcblk0p5 179 6 7876608 mmcblk0p6 179 7 81920 mmcblk0p7 179 8 6647808 mmcblk0p8 8 0 30258240 sda 8 1 30254208 sda1 |
The following is checking the contents of "/proc/mounts". It displays information about the currently mounted file system. You can see that the same thing like this is displayed when you run "mount" command.
| rootfs / rootfs rw 0 0 /dev/root / ext4 rw,noatime,data=ordered 0 0 devtmpfs /dev devtmpfs rw,relatime,size=186124k,nr_inodes=46531,mode=755 0 0 tmpfs /run tmpfs rw,nosuid,noexec,relatime,size=38080k,mode=755 0 0 tmpfs /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0 proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0 sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0 tmpfs /run/shm tmpfs rw,nosuid,nodev,noexec,relatime,size=76140k 0 0 devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0 /dev/mmcblk0p5 /boot vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,errors=remount-ro 0 0 /dev/mmcblk0p3 /media/SETTINGS ext4 rw,nosuid,nodev,relatime,data=ordered 0 0 /dev/mmcblk0p7 /media/boot vfat rw,nosuid,nodev,relatime,uid=1000,gid=1000,fmask=0022,dmask=0077,codepage=437,iocharset=ascii,shortname=mixed,showexec,utf8,flush,errors=remount-ro 0 0 /dev/sda1 /media/REAL_USB ntfs ro,nosuid,nodev,relatime,uid=1000,gid=1000,fmask=0177,dmask=077,nls=utf8,errors=continue,mft_zone_multiplier=1 0 0 /dev/mmcblk0p8 /media/root0 ext4 rw,nosuid,nodev,relatime,stripe=1024,data=ordered 0 0 |