# View the number and usage of motherboard memory slots
dmidecode|grep -P -A 5 "Memory\s+Device" | grep Size|grep -v Range
# View the maximum memory supported by the motherboard
sudo dmidecode | grep -P'Maximum\s+Capacity'
# View memory frequency
sudo dmidecode | grep -A16 "Memory Device" | grep'Speed '
# View memory and swap space usage
# -h View in Gibibytes.
free -m
hardware equipment
bash
# View hardware device
lshw
# PCI device list
lspci
# List block device
lsblk
# List partition table
fdisk -l
Transmission
scp
bash
# Use scp to transfer the file to transfer the local file data.zip to the server /data directory-
# P ssh port number
scp -P 22 /data/data.zip root@spaceack.com :/data
# Use scp to transfer files to transfer the remote directory remote_path to the local current directory
scp remote_username@remote _ip:/remote_path/*.
Use rsync to resumable uploads to backup resource directories containing large amounts of data!
-r, --recursive Subdirectories are processed recursively.
-t, --times keep file time information.
-P, --partial breakpoint to resume the transfer, --progress shows the transfer process.
--Rsh=COMMAND specifies the use of rsh and ssh for data synchronization, and rsh is clear text transmission.
-u, update only, prevent new local files from being overwritten (do not overwrite updated files).
--Ignore-existing, skip existing files on the receiving end, which will be used for directory incremental backup.
other
bash
# View the number of host ssh connections
w | grep pts |wc -l
# File batch rename
apt install rename
# Make U Disk Boot Disk (Centos7)
pv -cN source <CentOS-7-x86_64-DVD-1804.iso | sudo dd of=/dev/sdc
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