dev assets

1.Linux composition kernel, shell, tool program has Sh.bashAn example!#/bin/bashEcho 'Before execution chmod +xExecution./2. a little trick cp/dev/null/var/log/apache2/access.logUse/dev/null to apache2 log files in the clear sky Note: Think of /dev/null as a "black hole". It is very equivalent to a write-only file. All content written to it is lost forever. and t

First,/dev/shm theory The kernel configuration in the default Linux distribution will open Tmpfs and map to the SHM directory under/dev/. You can view the results through the DF command. /dev/shm/is the next most useful directory for Linux because it's not on the hard drive, it's in memory. Therefore, under Linux, there is no need for a lot of trouble to build

Environment: VMware WorkstationCentos7.2 x64A failure occurred:Divide two partitions on two disks to do PV (physical Volume):Modify two partition ID to 8ePvcreate/dev/sdb7/dev/sdc7Can ' t open/dev/sdb7 exclusively. Mounted filesystem?Because these two disks were previously used for soft Raid5, uninstall RAID5 First and then delete them.Umount/

最近想将服务器的本地硬盘通过LVM来灵活管理，具体问题如下： [[emailprotected] ~]# pvcreate /dev/sdbDevice/dev/sdb not found (or ignored by filtering).[Email protected] ~]# lsblkNAME maj:min RM SIZE RO TYPE mountpointNvme0n1 259:0 0 2.9T 0 diskSDA 8:0 0 744.1G 0 disk├─SDA1 8:1 0 5G 0 part/boot└─sda2 8:2 0 739.1G 0 part├─VOLGROUP-LOGVOL01 (dm-0) 253:0 0 390.6G 0 LVM/└─volgroup-logvol00 (dm-1) 253:1 0 260G 0 LVM [SWAP]SDB 8:16 0 21.8T 0 d

The generic file system name of the Linux system is similar to/DEV/SDA1 or/DEV/HDA1, but today, with the maintenance of the system, the DF-H command is used to knock out the/dev/mapper/volgroup-lv_root and/dev/mapper/ Volume-lv_home two file system name, puzzled, on the Internet to find information, in this talk about/

1: First Look at what our root partition size isDF -H文件系统 类型 容量 已用 可用 已用% 挂载点/dev/mapper/centos-rootxfs 18G 1.1G 17G 6% /devtmpfs devtmpfs 479M 0 479M 0%/devtmpfs tmpfs 489M 0 489M 0%/dev/shmtmpfs tmpfs 489M 6.7M 483M 2%/runtmpfs tmpfs 489M 0 489M 0%/sys/fs/cgroup/dev/sda1xfs 497M 125M 373M 25%/boottmpfs tmpfs 98M 0 98M 0%/run/user/02: Add a Physical disk to the

View the areas that are already well-divided[[EMAILNBSP;PROTECTED]NBSP;~]#NBSP;FDISKNBSP;-LNBSP;/DEV/SDANBSP;DISKNBSP;/DEV/SDA:NBSP;21.5NBSP;GB, 21474836480bytes255heads,63sectors/track,2610cylindersunits= cylindersof16065*512=8225280bytesSectorsize (logical/ Physical):512bytes/512bytesi/osize (minimum/optimal): 512bytes /512bytesDiskidentifier:0x7d57cb1fDeviceBoot StartEnd BlocksIdSystem/

/Dev/null2 gt; amp; 1 today, a friend suddenly saw the following content in his own Linux maintained:/var/spool/cron/root: www.2cto. com3019 ***/usr/bin/** dcon. sh gt;/dev/null2 gt; amp; 15923 ** 1-7/home /... /Dev/null 2> 1 details today a friend suddenly saw the following content in his own Linux maintained:/var/spool/cron/root: www.2cto.com 30 19 ****/u

Shell gt;/dev/null2 gt; amp; 1 details shell may often see: gt;/dev/null2 gt; amp; the result of the 1 command can be defined in the form of % gt;, where % gt; indicates the file descriptor. We combine this command: gt;/dev/null2 gt; amp; 1 split into four parts for analysis: 1: first... shell ">/dev/null 2>

Transferred from: http://blog.csdn.net/rockrockwu/article/details/7357648System boot process platform device, the driver registration is complete, why in the/dev directory is automatically created a good device node?The Automatically created device node in the/dev directory can be passed class_create () and then Device_create (). But in trackingKernel platform registration process can be found, in fact, the