Archive for August 28th, 2009

Howto: Linux convert an image between different formats from command prompt

Author: admin

Aug 28

Q. How do I convert images from a shell prompt? For example convert an image in the JPEG format to PNG or vise versa?

A. You need to use the convert command which is a member of the ImageMagick suite of tools. Use it to convert between image formats as well as
=> Resize an image
=> Blur an image
=> Crop an image
=> Despeckle an image
=> Dither an image
=> Draw on an image
=> Flip an image
=> Join an image
=> Re-sample, and much more.

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  • Filed under: Linux

    • Linux Set Date and Time From a Command Prompt

    Author: admin

    Aug 28

    Q. How can I set the system date and time from the command prompt (bash shell)? I don’t have GUI installed and I am login over ssh session.

    A. Use date command to display the current date and time or set the system date / time over ssh session.

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  • Filed under: Linux

    • unmount: /cdrom device is busy error and solution

    Author: admin

    Aug 28

    Q. I am trying to unmount remotely hosted Linux server. I have CD mounted and when ever I type command umount /cdrom or umount /dev/cdrom I get an error that read as follows:
    unmount: /cdrom device is busy

    How do I solve this problem?

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  • Filed under: Linux