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Take an LVM snapshot using a loopback device Create the snapshot
Take a look at the devices in your volume group. First there needs to be sufficient space in the volume group for a snapshot to occur. Check this by typing: vgdisplay and checking for Free PE / Size
Code:
vgdisplay -v
Create a loopback device to use for the snapshot. My volume group is named vg_echo360. I want my snapshot to be 9.9GB in size so I'm creating a loopback device which is 10GB in size....
I wanted to generate MD5 checksums of a whole bunch of files in a directory. It turns out that this is not as straightforward as it should be. IMO it should be completed with: md5sum -br *
Unfortunately it was not as straightforward. I found this blog entry after searching for a while and adapted this to what I needed. To generate checksums, I used the following:
Recently I wanted to manipulate files only in the current directory (not sub-directories). I usually use the following combination...
Code:
find . -type f -print0 | xargs -0 somecommand
The only problem I had with that was it ran through all sub-directories as well. Then I remembered the -m switch for ls and decided to depend on my good old friend sed.
applies to: linux, find, xargs, convert, image processing
'convert' command, which is a part of ImageMagick package can be used for image resizing, but it lacks ability to process multiple files (in version of ImageMagick 6.5.7-8 2010-12-02). Instead of writing a shell script you can use find and xargs commands to collect filenames and invoke convert with one filename at a time, like this:
We refer to a file by its name. Computer refer to the file by its inode numbers. For every filesystem; there is an inode table. This table consists of Inode numbers & its correspondingmetadata. On the contrary; the mapping of filenames to inode numbers is stored in the directory containing the file.
To display the inode number of a file; say hindu one must issue the command
Code:
ls -i hindu
To display the total number of inode numbers in the filesystem ; you must issue the command...
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