代码拉取完成，页面将自动刷新
#df -T 只可以查看已经挂载的分区和文件系统类型。
[root@localhost ~]# df -T
文件系统 类型 1K-块 已用 可用 已用% 挂载点
devtmpfs devtmpfs 909988 0 909988 0% /dev
tmpfs tmpfs 924712 0 924712 0% /dev/shm
tmpfs tmpfs 924712 9540 915172 2% /run
tmpfs tmpfs 924712 0 924712 0% /sys/fs/cgroup
/dev/mapper/cl-root xfs 17811456 10095744 7715712 57% /
/dev/sda1 ext4 999320 224256 706252 25% /boot
tmpfs tmpfs 184940 28 184912 1% /run/user/42
tmpfs tmpfs 184940 4 184936 1% /run/user/0
#fdisk -l 可以显示出所有挂载和未挂载的分区，但不显示文件系统类型。
[root@localhost ~]# fdisk -l
Disk /dev/sda：20 GiB，21474836480 字节，41943040 个扇区
单元：扇区 / 1 * 512 = 512 字节
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节
磁盘标签类型：dos
磁盘标识符：0xe82b74c8
设备 启动 起点 末尾 扇区 大小 Id 类型
/dev/sda1 * 2048 2099199 2097152 1G 83 Linux
/dev/sda2 2099200 41943039 39843840 19G 8e Linux LVM
Disk /dev/mapper/cl-root：17 GiB，18249416704 字节，35643392 个扇区
单元：扇区 / 1 * 512 = 512 字节
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节
Disk /dev/mapper/cl-swap：2 GiB，2147483648 字节，4194304 个扇区
单元：扇区 / 1 * 512 = 512 字节
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节
#parted -l 可以查看未挂载的文件系统类型，以及哪些分区尚未格式化。
[root@localhost ~]# parted -l
Model: VMware, VMware Virtual S (scsi)
Disk /dev/sda: 21.5GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system 标志
1 1049kB 1075MB 1074MB primary ext4 启动
2 1075MB 21.5GB 20.4GB primary lvm
#lsblk -f 也可以查看未挂载的文件系统类型。
[root@localhost ~]# lsblk -f
NAME FSTYPE LABEL UUID MOUNTPOINT
sda
├─sda1 ext4 ff037b8a-c85b-4d17-a919-7ab0b5ffb7e6 /boot
└─sda2 LVM2_member wVXcRD-XcjB-A0V7-xf4R-IU4s-S7Ew-Pom5Jf
├─cl-root xfs 546b9807-e6f9-44fd-8174-5a8edfd127bf /
└─cl-swap swap f5bb0909-dd7d-4ee4-b437-bfc3d27e60b7 [SWAP]
sr0
#file -s /dev/sda3
[root@localhost ~]# file -s /dev/sda2
/dev/sda2: LVM2 PV (Linux Logical Volume Manager), UUID: wVXcRD-XcjB-A0V7-xf4R-IU4s-S7Ew-Pom5Jf, size: 20400046080
[root@localhost ~]#
[root@localhost ~]# df -T
文件系统 类型 1K-块 已用 可用 已用% 挂载点
devtmpfs devtmpfs 909052 0 909052 0% /dev
tmpfs tmpfs 924732 0 924732 0% /dev/shm
tmpfs tmpfs 924732 9304 915428 2% /run
tmpfs tmpfs 924732 0 924732 0% /sys/fs/cgroup
/dev/mapper/cl-root xfs 17811456 7736956 10074500 44% /
/dev/sda1 ext4 999320 137084 793424 15% /boot
tmpfs tmpfs 184944 4 184940 1% /run/user/0
/dev/sdb1 / ext4 defaults 0 0
[root@localhost ~]# vim /etc/fstab
[root@localhost ~]# mount -a
#磁盘情况查询
[root@localhost ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
devtmpfs 888M 0 888M 0% /dev
tmpfs 904M 0 904M 0% /dev/shm
tmpfs 904M 9.1M 894M 2% /run
tmpfs 904M 0 904M 0% /sys/fs/cgroup
/dev/mapper/cl-root 17G 7.4G 9.6G 44% /
/dev/sdb1 2.0G 6.0M 1.9G 1% /boot
tmpfs 181M 4.0K 181M 1% /run/user/0
[root@localhost ~]# df -lh
文件系统 容量 已用 可用 已用% 挂载点
devtmpfs 888M 0 888M 0% /dev
tmpfs 904M 0 904M 0% /dev/shm
tmpfs 904M 9.1M 894M 2% /run
tmpfs 904M 0 904M 0% /sys/fs/cgroup
/dev/mapper/cl-root 17G 7.4G 9.6G 44% /
/dev/sdb1 2.0G 6.0M 1.9G 1% /boot
tmpfs 181M 4.0K 181M 1% /run/user/0
#查询每个目录的磁盘占用情况
[root@localhost ~]# du -h
[root@localhost ~]# du -ach --max-depth=1 /opt
1.3G /opt/module
520M /opt/software
4.0K /opt/test
1.8G /opt
1.8G 总用量
[root@localhost opt]# rm -rf software/
#统计某个目录下有多少个文件
[root@localhost home]# ls -l /home|grep "^-" |wc -l
#统计某个目录下个数
[root@localhost home]# ls -l /home|grep "^d" |wc -l
-R包括子目录下文件及文件夹
[root@localhost home]# ls -lR /home|grep "^-" |wc -l
[root@localhost home]# ls -lR /home|grep "^-" |wc -l
#以树状图显示目录
[root@localhost home]# tree
.
├── atguigu
│ ├── 公共
│ ├── 模板
│ ├── 视频
│ ├── 图片
│ ├── 文档
│ ├── 下载
│ ├── 音乐
│ └── 桌面
├── houyingchao
├── newdisk
│ └── lost+found
└── zhangsan
13 directories, 0 files
IPv4 地址 . . . . . . . . . . . . : 192.168.189.1
iscsi=internet+scsi
1.为虚拟机添加4块硬盘
[root@hadoop100 ~]# ll /dev/sd*
brw-rw----. 1 root disk 8, 0 4月 24 18:56 /dev/sda
brw-rw----. 1 root disk 8, 1 4月 24 18:56 /dev/sda1
brw-rw----. 1 root disk 8, 2 4月 24 18:56 /dev/sda2
brw-rw----. 1 root disk 8, 16 4月 24 18:56 /dev/sdb
brw-rw----. 1 root disk 8, 32 4月 24 18:56 /dev/sdc
brw-rw----. 1 root disk 8, 48 4月 24 18:56 /dev/sdd
brw-rw----. 1 root disk 8, 64 4月 24 18:56 /dev/sde
[root@hadoop100 ~]# lsblk -f
NAME FSTYPE LABEL UUID MOUNTPOINT
sda
├─sda1 ext4 8fb29c11-6deb-4bfc-9412-5bbf5f70749c /boot
└─sda2 LVM2_membe eECR5H-m3xa-D48j-JaYu-1qFs-3miM-qEdPIz
├─cl-root
│ xfs 1a39b8c3-0d95-4fef-a0ca-e4a71f066314 /
└─cl-swap
swap c3f742af-d529-455d-ab90-ad047bc32e2e [SWAP]
sdb
sdc
sdd
sde
sr0 iso9660 CentOS-8-BaseOS-x86_64 2019-08-15-21-52-52-00 /run/media/root/CentOS-8-BaseO
#通过上述明亮查询到添加的硬盘为sdb、sdc、sdd、sde
[root@hadoop100 ~]# mdadm -Cv /dev/md0 -n 4 -l 10 /dev/sd[b-e]
mdadm: layout defaults to n2
mdadm: layout defaults to n2
mdadm: chunk size defaults to 512K
mdadm: size set to 2094080K
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
[root@hadoop100 ~]# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Fri Apr 24 19:16:51 2020
Raid Level : raid10
Array Size : 4188160 (3.99 GiB 4.29 GB)
Used Dev Size : 2094080 (2045.00 MiB 2144.34 MB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Fri Apr 24 19:17:11 2020
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : near=2
Chunk Size : 512K
Consistency Policy : resync
Name : hadoop100:0 (local to host hadoop100)
UUID : 17dcaf86:07099fad:1495421f:47c7d9a7
Events : 17
Number Major Minor RaidDevice State
0 8 16 0 active sync set-A /dev/sdb
1 8 32 1 active sync set-B /dev/sdc
2 8 48 2 active sync set-A /dev/sdd
3 8 64 3 active sync set-B /dev/sde
[root@hadoop100 ~]#
[root@hadoop100 ~]# yum -y install targetd targetcli
Repository AppStream is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository PowerTools is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
上次元数据过期检查：1 day, 9:15:20 前，执行于 2020年04月24日 星期五 22时54分46秒。
未找到匹配的参数： targetd
Package targetcli-2.1.fb49-1.el8.noarch is already installed.
错误：没有任何匹配
[root@hadoop100 ~]# systemctl restart iscsid
[root@hadoop100 ~]# systemctl enable iscsid
Created symlink /etc/systemd/system/multi-user.target.wants/iscsid.service → /usr/lib/systemd/system/iscsid.service.
[root@hadoop100 ~]#
#交互式配置
[root@hadoop100 ~]# targetcli
Warning: Could not load preferences file /root/.targetcli/prefs.bin.
targetcli shell version 2.1.fb49
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.
/> ls
o- / ......................................................................................................................... [...]
o- backstores .............................................................................................................. [...]
| o- block .................................................................................................. [Storage Objects: 0]
| o- fileio ................................................................................................. [Storage Objects: 0]
| o- pscsi .................................................................................................. [Storage Objects: 0]
| o- ramdisk ................................................................................................ [Storage Objects: 0]
o- iscsi ............................................................................................................ [Targets: 0]
o- loopback ......................................................................................................... [Targets: 0]
/>
/> cd backstores/block/
/backstores/block> create disk /dev/md0
Created block storage object disk using /dev/md0.
/backstores/block> cd /
/> ls
o- / ......................................................................................................................... [...]
o- backstores .............................................................................................................. [...]
| o- block .................................................................................................. [Storage Objects: 1]
| | o- disk ........................................................................... [/dev/md0 (4.0GiB) write-thru deactivated]
| | o- alua ................................................................................................... [ALUA Groups: 1]
| | o- default_tg_pt_gp ....................................................................... [ALUA state: Active/optimized]
| o- fileio ................................................................................................. [Storage Objects: 0]
| o- pscsi .................................................................................................. [Storage Objects: 0]
| o- ramdisk ................................................................................................ [Storage Objects: 0]
o- iscsi ............................................................................................................ [Targets: 0]
o- loopback ......................................................................................................... [Targets: 0]
/>
cd iscsi
/iscsi>
/iscsi> create
Created target iqn.2003-01.org.linux-iscsi.hadoop100.x8664:sn.32f217e1daeb.
Created TPG 1.
Global pref auto_add_default_portal=true
Created default portal listening on all IPs (0.0.0.0), port 3260.
/iscsi> ls
o- iscsi .............................................................................................................. [Targets: 1]
o- iqn.2003-01.org.linux-iscsi.hadoop100.x8664:sn.32f217e1daeb ......................................................... [TPGs: 1]
o- tpg1 ................................................................................................. [no-gen-acls, no-auth]
o- acls ............................................................................................................ [ACLs: 0]
o- luns ............................................................................................................ [LUNs: 0]
o- portals ...................................................................................................... [Portals: 1]
o- 0.0.0.0:3260 ....................................................................................................... [OK]
/iscsi> cd iqn.2003-01.org.linux-iscsi.hadoop100.x8664:sn.32f217e1daeb/
/iscsi/iqn.20....32f217e1daeb> ls
o- iqn.2003-01.org.linux-iscsi.hadoop100.x8664:sn.32f217e1daeb ........................................................... [TPGs: 1]
o- tpg1 ................................................................................................... [no-gen-acls, no-auth]
o- acls .............................................................................................................. [ACLs: 0]
o- luns .............................................................................................................. [LUNs: 0]
o- portals ........................................................................................................ [Portals: 1]
o- 0.0.0.0:3260 ......................................................................................................... [OK]
/iscsi/iqn.20....32f217e1daeb> cd tpg1/luns
/iscsi/iqn.20...aeb/tpg1/luns> create /backstores/block/disk
Created LUN 0.
/iscsi/iqn.20...aeb/tpg1/luns> cd ..
/iscsi/iqn.20...17e1daeb/tpg1> cd acls
/iscsi/iqn.20...aeb/tpg1/acls> create iqn.2003-01.org.linux-iscsi.hadoop100.x8664:sn.32f217e1daeb:client
Created Node ACL for iqn.2003-01.org.linux-iscsi.hadoop100.x8664:sn.32f217e1daeb:client
Created mapped LUN 0.
/iscsi/iqn.20...aeb/tpg1/acls>
/iscsi/iqn.20...17e1daeb/tpg1> cd portals/
/iscsi/iqn.20.../tpg1/portals> crrate 192.168.40.100
Command not found crrate
/iscsi/iqn.20.../tpg1/portals> create 192.168.40.100
Using default IP port 3260
Could not create NetworkPortal in configFS
iscsi/iqn.20.../tpg1/portals> delete 0.0.0.0 3260
Deleted network portal 0.0.0.0:3260
/iscsi/iqn.20.../tpg1/portals> create 192.168.40.100
Using default IP port 3260
Created network portal 192.168.40.100:3260.
/iscsi/iqn.20.../tpg1/portals>ls /
o- / ......................................................................................................................... [...]
o- backstores .............................................................................................................. [...]
| o- block .................................................................................................. [Storage Objects: 1]
| | o- disk ............................................................................. [/dev/md0 (4.0GiB) write-thru activated]
| | o- alua ................................................................................................... [ALUA Groups: 1]
| | o- default_tg_pt_gp ....................................................................... [ALUA state: Active/optimized]
| o- fileio ................................................................................................. [Storage Objects: 0]
| o- pscsi .................................................................................................. [Storage Objects: 0]
| o- ramdisk ................................................................................................ [Storage Objects: 0]
o- iscsi ............................................................................................................ [Targets: 1]
| o- iqn.2003-01.org.linux-iscsi.hadoop100.x8664:sn.32f217e1daeb ....................................................... [TPGs: 1]
| o- tpg1 ............................................................................................... [no-gen-acls, no-auth]
| o- acls .......................................................................................................... [ACLs: 1]
| | o- iqn.2003-01.org.linux-iscsi.hadoop100.x8664:sn.32f217e1daeb:client ................................... [Mapped LUNs: 1]
| | o- mapped_lun0 .................................................................................. [lun0 block/disk (rw)]
| o- luns .......................................................................................................... [LUNs: 1]
| | o- lun0 ....................................................................... [block/disk (/dev/md0) (default_tg_pt_gp)]
| o- portals .................................................................................................... [Portals: 1]
| o- 192.168.40.100:3260 .............................................................................................. [OK]
o- loopback ......................................................................................................... [Targets: 0]
/iscsi/iqn.20.../tpg1/portals>
/iscsi/iqn.20.../tpg1/portals> exit
Global pref auto_save_on_exit=true
Configuration saved to /etc/target/saveconfig.json
出错了
[root@hadoop100 ~]# systemctl restart targetd
Failed to restart targetd.service: Unit targetd.service not found.
#记住
iqn.2003-01.org.linux-iscsi.hadoop100.x8664:sn.32f217e1daeb
配置客户端
192.168.40.101
[root@hadoop101 ~]# yum install iscsi-initiator-utils
[root@hadoop101 ~]# vim /etc/iscsi/initiatorname.iscsi
[root@hadoop101 ~]# cat /etc/iscsi/initiatorname.iscsi
iqn.2003-01.org.linux-iscsi.hadoop100.x8664:sn.32f217e1daeb
[root@hadoop101 ~]# systemctl restart iscsid
[root@hadoop101 ~]# systemctl enable iscsid
Created symlink /etc/systemd/system/multi-user.target.wants/iscsid.service → /usr/lib/systemd/system/iscsid.service.
[root@hadoop101 ~]#
客户端192.168.40.101
[root@localhost ~]# yum install bind-chroot
[root@localhost ~]# yum install dhcp
[root@localhost ~]# hostnamectl set-hostname localhost
[root@localhost ~]# ulimit -u
14919
[root@localhost ~]# ulimit -u 10000
[root@localhost ~]# ulimit -u
10000
#列出当前执行过的命令。
[root@localhost ~]# fc -l
#查看内存使用情况
[root@localhost ~]# free
total used free shared buff/cache available
Mem: 3848816 1178104 1756900 18256 913812 2399952
Swap: 4194296 0 4194296
[root@localhost ~]# free -g
total used free shared buff/cache available
Mem: 3 1 1 0 0 2
Swap: 3 0 3
[root@localhost ~]# free -m
total used free shared buff/cache available
Mem: 3758 1150 1716 17 892 2344
Swap: 4095 0 4095
[root@localhost ~]# uptime
21:41:18 up 9 min, 1 user, load average: 0.06, 0.50, 0.47
#按1显示CPU核数及其使用情况
[root@localhost ~]# top
top - 21:39:57 up 8 min, 1 user, load average: 0.08, 0.64, 0.51
Tasks: 226 total, 1 running, 225 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.0 us, 0.1 sy, 0.0 ni, 99.7 id, 0.0 wa, 0.2 hi, 0.1 si, 0.0 st
MiB Mem : 3758.6 total, 1787.3 free, 1131.5 used, 839.8 buff/cache
MiB Swap: 4096.0 total, 4096.0 free, 0.0 used. 2360.0 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
6906 mysql 20 0 2450596 421436 29924 S 0.7 10.9 0:05.63 mysqld
7560 root 20 0 64212 4852 3984 R 0.3 0.1 0:00.31 top
1 root 20 0 244660 13940 8972 S 0.0 0.4 0:04.73 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.04 kthreadd
3 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 rcu_gp
4 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 rcu_par_gp
5 root 20 0 0 0 0 I 0.0 0.0 0:02.23 kworker/0:0-events_power_efficient
6 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker/0:0H-kblockd
7 root 20 0 0 0 0 I 0.0 0.0 0:00.31 kworker/u256:0-flush-253:0
8 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 mm_percpu_wq
9 root 20 0 0 0 0 S 0.0 0.0 0:00.04 ksoftirqd/0
10 root 20 0 0 0 0 I 0.0 0.0 0:00.67 rcu_sched
11 root rt 0 0 0 0 S 0.0 0.0 0:00.03 migration/0
12 root rt 0 0 0 0 S 0.0 0.0 0:00.00 watchdog/0
13 root 20 0 0 0 0 S 0.0 0.0 0:00.00 cpuhp/0
14 root 20 0 0 0 0 S 0.0 0.0 0:00.00 cpuhp/1
15 root rt 0 0 0 0 S 0.0 0.0 0:00.00 watchdog/1
16 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/1
17 root 20 0 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/1 [root@localhost ~]# vmstat -n 2 3
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
r b swpd free buff cache si so bi bo in cs us sy id wa st
0 0 0 1767840 4344 909108 0 0 146 29 131 158 1 2 94 4 0
0 0 0 1767644 4344 909108 0 0 0 0 248 455 0 0 100 0 0
0 0 0 1767644 4344 909108 0 0 0 0 231 441 0 0 100 0 0
#磁盘空间
[root@localhost ~]# df
文件系统 1K-块 已用 可用 已用% 挂载点
devtmpfs 1909684 0 1909684 0% /dev
tmpfs 1924408 0 1924408 0% /dev/shm
tmpfs 1924408 18056 1906352 1% /run
tmpfs 1924408 0 1924408 0% /sys/fs/cgroup
/dev/mapper/cl-root 17811456 13430404 4381052 76% /
/dev/sdb1 5231616 87932 5143684 2% /newdisk
/dev/sda1 999320 226260 704248 25% /boot
tmpfs 384880 28 384852 1% /run/user/42
tmpfs 384880 4 384876 1% /run/user/0
[root@localhost ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 18M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/mapper/cl-root 17G 13G 4.2G 76% /
/dev/sdb1 5.0G 86M 5.0G 2% /newdisk
/dev/sda1 976M 221M 688M 25% /boot
tmpfs 376M 28K 376M 1% /run/user/42
tmpfs 376M 4.0K 376M 1% /run/user/0
[root@localhost ~]# ifstat
#kernel
Interface RX Pkts/Rate TX Pkts/Rate RX Data/Rate TX Data/Rate
RX Errs/Drop TX Errs/Drop RX Over/Rate TX Coll/Rate
lo 609 0 609 0 79988 0 79988 0
0 0 0 0 0 0 0 0
ens33 9306 0 6419 0 10377K 0 2957K 0
0 0 0 0 0 0 0 0
virbr0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
docker0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
[root@localhost ~]# ps -mp 8652 -o THREAD,tid,time
USER %CPU PRI SCNT WCHAN USER SYSTEM TID TIME
root 0.0 - - - - - - 00:00:00
root 0.0 19 - - - - 8652 00:00:00
[root@localhost ~]# mkdir shellstudy
[root@localhost ~]# cd shellstudy/
[root@localhost shellstudy]# vim myShell.h
[root@localhost shellstudy]# cat myShell.h
#!/bin/bash
echo "hello world!"
[root@localhost shellstudy]# ll
总用量 4
-rw-r--r--. 1 root root 32 5月 28 07:45 myShell.h
[root@localhost shellstudy]# chmod 744 myShell.h
[root@localhost shellstudy]# ll
总用量 4
-rwxr--r--. 1 root root 32 5月 28 07:45 myShell.h
[root@localhost shellstudy]# ./myShell.h
hello world!
[root@localhost shellstudy]# /root/shellstudy/myShell.h
hello world!
[root@localhost shellstudy]# chmod 644 myShell.h
[root@localhost shellstudy]# bash ./myShell.h
hello world!
[root@localhost shellstudy]# sh ./myShell.h
hello world!
[root@localhost shellstudy]# vim myShell.sh
[root@localhost shellstudy]# cat myShell.sh
#!/bin/bash
echo "hello world!"
echo "PATH=$PATH"
echo "user=$USER"
[root@localhost shellstudy]# ./myShell.sh
hello world!
PATH=//usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/opt/module/jdk1.8.0_144/bin:/usr/local/mycat/bin:/opt/apache-maven-3.6.3/bin:/root/bin
user=root
[root@localhost shellstudy]#
#分页显示
[root@localhost shellstudy]# set | more
BASH=/bin/bash
BASHOPTS=checkwinsize:cmdhist:complete_fullquote:expand_aliases:extglob:extquote:force_fignore:histappend:interactive_comments:login_s
hell:progcomp:promptvars:sourcepath
BASHRCSOURCED=Y
BASH_ALIASES=()
BASH_ARGC=()
BASH_ARGV=()
BASH_CMDS=()
BASH_COMPLETION_VERSINFO=([0]="2" [1]="7")
BASH_LINENO=()
BASH_REMATCH=()
BASH_SOURCE=()
BASH_VERSINFO=([0]="4" [1]="4" [2]="19" [3]="1" [4]="release" [5]="x86_64-redhat-linux-gnu")
BASH_VERSION='4.4.19(1)-release'
CATALINA_HOME=/opt/apache-tomcat-9.0.30
COLUMNS=134
COMP_WORDBREAKS=$' \t\n"\\'><=;|&(:'
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/0/bus
DIRSTACK=()
DISPLAY=localhost:10.0
[root@localhost shellstudy]# vim myShell.sh
[root@localhost shellstudy]# cat myShell.sh
#!/bin/bash
A=100
echo "A=$A"
unset A
echo "A=$A"
[root@localhost shellstudy]# ./myShell.sh
A=100
A=
[root@localhost shellstudy]# vim myShell.sh
[root@localhost shellstudy]# cat myShell.sh
#!/bin/bash
readonly A=99
echo "A=$A"
unset A
echo "A=$A"
[root@localhost shellstudy]# ./myShell.sh
A=99
./myShell.sh: 第 14 行:unset: A: 无法取消设定: 只读 variable
A=99
[root@localhost shellstudy]# vim myShell.sh
[root@localhost shellstudy]# cat myShell.sh
#!/bin/bash
RESULT=`ls -l /home`
echo "$RESULT"
[root@localhost shellstudy]# ./myShell.sh
总用量 12
drwx------. 22 houyingchao houyingchao 4096 5月 21 14:32 houyingchao
drwx------. 15 hyc hyc 4096 4月 22 19:44 hyc
drwx------. 15 lisi lisi 4096 5月 21 14:37 lisi
drwx------. 3 mycat mycat 78 1月 31 17:27 mycat
drwx------. 3 xiaoguo xiaoguo 78 4月 22 18:33 xiaoguo
d---rwx---+ 2 root root 6 4月 23 08:39 xiaoqian
drwxrwsrwx. 2 root root 18 4月 23 07:22 xiaoyun
drwx------. 3 xiaozheng xiaozheng 78 4月 22 18:37 xiaozheng
drwx------. 3 zhangsan zhangsan 99 4月 23 07:36 zhangsan
[root@localhost shellstudy]#
[root@localhost shellstudy]# vim myShell.sh
[root@localhost shellstudy]# cat myShell.sh
#!/bin/bash
RESULT=`ls -l /home`
echo "$RESULT"
echo ""
MY_DATE=$(date)
echo "date=$MY_DATE"
[root@localhost shellstudy]# ./myShell.sh
总用量 12
drwx------. 22 houyingchao houyingchao 4096 5月 21 14:32 houyingchao
drwx------. 15 hyc hyc 4096 4月 22 19:44 hyc
drwx------. 15 lisi lisi 4096 5月 21 14:37 lisi
drwx------. 3 mycat mycat 78 1月 31 17:27 mycat
drwx------. 3 xiaoguo xiaoguo 78 4月 22 18:33 xiaoguo
d---rwx---+ 2 root root 6 4月 23 08:39 xiaoqian
drwxrwsrwx. 2 root root 18 4月 23 07:22 xiaoyun
drwx------. 3 xiaozheng xiaozheng 78 4月 22 18:37 xiaozheng
drwx------. 3 zhangsan zhangsan 99 4月 23 07:36 zhangsan
date=2020年 05月 28日 星期四 08:34:00 CST
[root@localhost shellstudy]#
#JAVA_HOME
export JAVA_HOME=/opt/module/jdk1.8.0_144
export PATH=$PATH:$JAVA_HOME/bin
#TOMCAT环境变量
export TOMCAT_HOME=/opt/apache-tomcat-9.0.30
export CATALINA_HOME=/opt/apache-tomcat-9.0.30
#mycat配置环境变量
export MYCAT_HOME=/usr/local/mycat
export PATH=/$PATH:$MYCAT_HOME/bin
#maven 环境变量
export MAVEN_HOME=/opt/apache-maven-3.6.3
export PATH=$PATH:${MAVEN_HOME}/bin
source /etc/profile
[root@localhost shellstudy]# cat myShell.sh
#!/bin/bash
#多行注释
:<<!
RESULT=`ls -l /home`
echo "$RESULT"
echo ""
MY_DATE=$(date)
echo "date=$MY_DATE"
!
echo $TOMCAT_HOME
[root@localhost shellstudy]#
[root@localhost shellstudy]# ./myShell.sh
/opt/apache-tomcat-9.0.30
[root@localhost shellstudy]# vim positionPara.sh
[root@localhost shellstudy]# chmod 744 positionPara.sh
[root@localhost shellstudy]# cat positionPara.sh
#!/bin/bash
#获取到各个参数
echo "$0 $1 $2"
echo "$*"
echo "$@"
echo "参数个数=$#"
[root@localhost shellstudy]# ./positionPara.sh
./positionPara.sh
参数个数=0
[root@localhost shellstudy]# ./positionPara.sh 45 7
./positionPara.sh 45 7
45 7
45 7
参数个数=2
[root@localhost shellstudy]#
$$ （功能描述：当前进程的进程号（PID））
$! （功能描述：后台运行的最后一个进程的进程号（PID））
$？ （功能描述：最后一次执行的命令的返回状态。如果这个变量的值为 0，证明上一个命令正确执行；如果这个变量的值为非 0（具体是哪个数，由命令自己来决定），则证明上一个命令执行不正确了。
[root@localhost shellstudy]# vim preVar.sh
[root@localhost shellstudy]# ll
总用量 12
-rwxr--r--. 1 root root 323 5月 28 08:45 myShell.sh
-rwxr--r--. 1 root root 94 5月 28 09:01 positionPara.sh
-rw-r--r--. 1 root root 166 5月 28 09:13 preVar.sh
[root@localhost shellstudy]# chmod 744 preVar.sh
[root@localhost shellstudy]# cat preVar.sh
#!/bin/bash
echo "当前的进程号=$$"
#后台的方式运行myShell & 表示后台运行
./myShell.sh &
echo "最后的进程号=$!"
echo "执行的值=$?"
[root@localhost shellstudy]# ./preVar.sh
当前的进程号=9088
最后的进程号=9089
执行的值=0
[root@localhost shellstudy]# /opt/apache-tomcat-9.0.30
^C
[root@localhost shellstudy]#
[root@localhost ~]# free
total used free shared buff/cache available
Mem: 817272 544220 63888 1400 209164 125616
Swap: 7340024 612096 6727928
[root@localhost ~]# free -h
total used free shared buff/cache available
Mem: 798Mi 531Mi 51Mi 1.0Mi 214Mi 122Mi
Swap: 7.0Gi 598Mi 6.4Gi
[root@localhost ~]# top
top - 05:24:18 up 15:19, 1 user, load average: 0.23, 0.32, 0.25
Tasks: 222 total, 1 running, 221 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.8 us, 1.8 sy, 0.0 ni, 96.8 id, 0.0 wa, 0.5 hi, 0.1 si, 0.0 st
MiB Mem : 798.1 total, 64.6 free, 530.8 used, 202.7 buff/cache
MiB Swap: 7168.0 total, 6569.7 free, 598.2 used. 123.5 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
60 root 20 0 0 0 0 S 0.7 0.0 1:34.62 kswapd0
20177 root 20 0 64204 1660 1212 R 0.7 0.2 0:01.58 top
1 root 20 0 245156 5784 2728 S 0.3 0.7 1:19.72 systemd
1444 root 20 0 248644 2636 1616 S 0.3 0.3 0:15.44 rsyslogd
13737 systemd+ 20 0 3259256 10312 932 S 0.3 1.3 4:31.61 beam.smp
[root@localhost ~]# uptime
05:28:06 up 15:22, 1 user, load average: 0.09, 0.18, 0.20
#查询每个目录的磁盘占用情况
[root@localhost ~]# du -ach --max-depth=1 /opt
1.4G /opt/module
36M /opt/cni
0 /opt/containerd
143M /opt/soft
0 /opt/downloads
1.5G /opt
1.5G 总用量
[root@localhost ~]# df -h
[root@localhost ~]# df -T
[root@localhost ~]# top -c
[root@localhost ~]# top -Hp 14235
ps aux
当一个进程kiss不掉时
ps -ef |grep 僵尸进程id ，找到父进程id ,kiss调即可
du -h 查看各个目录占用的磁盘空间大小，看看不是不是那个目录有大量文件
du -h>hyceshi.log 把结果输入到hyceshi.log文件中
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