How to find the largest files and directories in Linux?
Answer:
For example, to list out top 10 files and directories inside /opt, you can use the following command:
# du -a /opt| sort -nr | head -n 10
Jun 092011
Linux Ask!
Jun 072011
Perform XtraBackup and zip to a file
Answer:
In the previous article, we have discussed how to perform a hot backup on InnoDB with XtraBackup , but is it possible to zip the result directly to a file?
Sure, you can use the wrapper script came with the XtraBackup - innobackupex
For example, to backup and zip the result files to zipped files, you can use:
# innobackupex --stream=tar ./ | gzip - > backup.tar.gz
Jun 052011
Create a swap partition using LVM
Answer:
To create a swap partition using LVM, you just need a few commands!
1. Create a 1G swap partition
# lvcreate -L 1G -n /dev/vg0/swap0
2. Set up a Linux swap partition
# mkswap /dev/vg0/swap0
3. Enable it
# swapon -s /dev/vg0/swap0
You might also want to put the settings in the /etc/fstab, so it will be mounted automatically when your system boot next time.
# sudo vi /etc/fstab
/dev/vg0/swap0 none swap sw 0 0
Save and restart your system to test if it is working when system reboot.
Jun 032011
How to echo string to standard error (stderr)?
Answer:
To echo string to the standard error (stderr), rather than the standard output (stdout), you can define the following function in your shell (put in your ~/.bashrc file)
# function echo2() { echo "$@" 1>&2; }
Then you can execute the command like:
# echo2 test
Jun 012011
Simple for loop in Bash shell
Answer:
A simple for loop in Bash shell would like the following. You can use it wisely to skip a lot of repetitive tasks.
#!/bin/bash
for i in {1..10}
do
echo "I am command No. $i"
done
