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Editorial Team
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Asked: 2026-06-15T13:16:10+00:00

I have a list of users like below and I would like to convert

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I have a list of users like below and I would like to convert the units to gigabytes

user1@example.com   Mbox size: 7445440 Kb
user2@example.com   Mbox size: 6622275 Kb
user3@example.com   Mbox size: 4657973 Kb
user"n"@example.com     Mbox size: 3657673 Kb

Any help would be appreciated.

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1 Answer

  1. Editorial Team

    For calculations I like to use awk embedded in bash scripts.

    Save the script below to a file, e.g. togb.sh and make it executable. If you need decimals, just adapt the printf format.

    #!/bin/bash - 
awk '{ printf("%5.3f\n", $4 / (1024*1024)); }' $1

    Store your data in a file data.txt and call the script using the commandline:

    ./togb.sh data.txt 
7
6
4
4

    To display the list in the same format but with changed units, you would use this slightly changed script:

    #!/bin/bash - 
awk '{ printf("%s %s %s %5.3f GB\n", $1, $2, $3, $4 / (1024*1024)); }' $1

    The output of this script would be:

    user1@example.com Mbox size: 7.270 GB
user2@example.com Mbox size: 6.467 GB
user3@example.com Mbox size: 4.548 GB
user"n"@example.com Mbox size: 3.571 GB

    By the way, awk can do much more than this, it’s in fact ideal for processing data stored in text files.

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