Category Archives: Linux

To break up a large .csv file into multiple smaller files with 1000 lines:sed -n ‘1,1001p’ large_table.csv > output_1.csv sed -n ‘1002,2001p’ large_table.csv > output_2.csv

To see memory and CPU usage for all containers: docker stats b. To see disk usage for all containers: docker ps -s c. To see memory usage for all containers: docker stats –no-stream –format “{{.Name}}: {{.MemUsage}}” d. To see which … Continue reading →

Use ssh to execute a command on a remote system:ssh user@user@server.com <command> Create a log of an ssh session:ssh user@server.com | tee -a ~/server.com.ssh.log Copy a file from your local directory to a directory on a remote system:scp [filename] [user]@[server.com]:/remote/directory

Remove the ABCD– prefix from a filename:$ s=’ABCD –11212239.pdf’$ mv “$s” “${s#ABCD–}” Remove the prefix from all files in current directory recursively:while IFS= read -r -d ” filename; do mv “$filename” “${filename#ABCD–}”done < <(find . -type f -name ‘ABCD–*’ -print0) … Continue reading →

#Check size of Volume Groupdf -h -T | grep vg#Display volume group info. Check for free spacesudo vgdisplay#Display logical volume infosudo lvdisplay#Test runsudo lvextend -t -v -l +100%FREE /dev/ubuntu-vg/ubuntu-lv#Actual runsudo lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv#Resize logical volumesudo resize2fs /dev/ubuntu-vg/ubuntu-lv#Verifydf -h -T … Continue reading →

To boot into single user mode from the Grub menu: In Ubuntu, the Grub Menu should appear if you press and hold Shift while Grub is loading, if you boot using BIOS. If your Ubuntu system boots using UEFI, press Esc instead. You … Continue reading →

Calculate MySQL Memory Usage – Quick Stored Procedure

To see what systems on the 192.168.11.0 network are listening on port 22:nmap -sV -p 22 192.168.11.0/24 To do an nmap ping scan on 192.168.11.0 network:nmap -sp 192.168.11.0/24 To scan the top five ports on 192.168.11.7:nmap –top-ports 5 192.168.11.7

Use the Linux Standard Base command as follows:lsb__release -a