cut-b 锛欳uts by bytes. These byte positions will ignore multi-byte character boundaries unless the -n flag is also specified.
-c 锛欳uts by characters.-d锛欳ustom delimiter, default is tab.-f锛歎sed with -d to specify which field to display.-n锛欴o not split multi-byte characters. Only …
centos :
last -f /var/log/btmp
last -f /var/log/btmp |grep "Fri Sep 17" #Add filter criteria to search
debian:
tail -f /var/log/auth.log
…
Find all files containing a specific string in Linux
Use grep -ri "string" or find . | xargs grep -ri …
ufw is the default firewall in Debian and Ubuntu Linux distributions. Below, we’ll look at some commonly used commands.
ufw enable #Enable ufw on boot
ufw allow 22/tcp #Allow all access to port 22
ufw default deny #Deny all by default
ufw allow from 10.0 …
Create a 2GB file:
mkdir /www/swap
dd if=/dev/zero of=/www/swap/swap bs=1024 count=2048000
2048000+0 records in
2048000+0 records out
2097152000 bytes (2.1 GB) copied, 6.70164 s, 313 MB/s …
Sometimes when you need to transfer files from a local Windows host to a remote Linux server without using an FTP tool, you can use this utility for file transfers.
Installation:
yum -y install lrzsz
Drag and drop files into the SSH tool window:
View uploaded files:
…
nmap is a very handy free port testing and scanning tool that can test port connectivity. Below is a simple port test using this tool.
CentOS system: yum -y install nmap
Ubuntu system: apt -y install nmap
Test command: 8585 is the port to test.
nmap 192. …
RDesktop Error: Remote Desktop Does Not Support Colour Depth 24; Falling Back to 16 Fix
Solution: Add the -a parameter for better display quality.
Example:
rdesktop 192.168.1.xxx -u administrator -p password
Change to: …
RDesktop is an excellent tool for remotely connecting to Windows from Linux.
For installation, refer to: Using rdesktop to remotely access a Windows host from Linux
Basic command:
rdesktop 192.168.1.xxx
Connection with username and password:
rdesktop 192.168.1.xxx -u administrat …
Check current disk usage: df -h
fdisk -l #View all disk statuses
By comparison, we can see there is a 500G /dev/vdb that is not mounted.
Partition and format: fdisk -S 56 /dev/vdb. Input respectively: "n" , "p" , "1" ,"Enter"，"Enter" , "wq"。
f …
