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Category: Tip

AWS dynamic IP ranges

Hi,

What are the dynamic IP ranges used by AWS in Ireland for the EC2 service?

$ curl -s https://ip-ranges.amazonaws.com/ip-ranges.json | jq '.p[......]

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Author AndreaPosted on November 15, 2018Categories Fun, How To, Programming, TipTags AWS, Bash, Linux, One-linerLeave a comment on AWS dynamic IP ranges

How to soft reset Linux disks

Sometimes disks stop responding and cause issues/slowness to the whole system, simply because the system is expecting some sort of response.
In these[……]

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Author AndreaPosted on November 27, 2017Categories How To, TipTags Bash, Hard Disk, LinuxLeave a comment on How to soft reset Linux disks

Find sdx device/ATAx mappings

When dealing with hardware, you often see messages in the logs about disk issues or warnings.
Messages like:

ata9: hard resetting link
ata9: SATA[......]

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Author AndreaPosted on March 18, 2017Categories How To, Programming, TipTags Bash, Hard Disk, Linux, One-linerLeave a comment on Find sdx device/ATAx mappings

Convert Squid/timestamps to a human readable format

Somebody had the brilliant idea to use Unix timestamps in the Squid log.
I suppose this makes it easy to parse, not so easy to read for us humans tho[……]

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Author AndreaPosted on January 31, 2017January 31, 2017Categories Programming, TipTags Bash, One-liner, Perl, Squid1 Comment on Convert Squid/timestamps to a human readable format

bash – remove first line with tail and last line with head

You can achieve the same result with other (more powerful) tools, but I like this approach because it’s the simplest I can think of.

Let’s say you[……]

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Author AndreaPosted on January 29, 2017Categories Programming, TipTags Bash, Head, One-liner, TailLeave a comment on bash – remove first line with tail and last line with head

sed – match and replace BIND/DNS serial number programmatically

I had to make some modifications to several BIND zone files, sed proved itself invaluable once again!

All the zone files looked something like this[……]

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Author AndreaPosted on January 27, 2017March 18, 2017Categories How To, Programming, TipTags Bash, DNS, SedLeave a comment on sed – match and replace BIND/DNS serial number programmatically

Remove all non-ascii characters with perl

Sometimes when creating one-liners, when the source is not “clean”, you may end up with non-ascii characters which make the parsing harder.

To get[……]

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Author AndreaPosted on January 26, 2017January 26, 2017Categories How To, Programming, TipTags One-liner, PerlLeave a comment on Remove all non-ascii characters with perl

Converting spreadsheets to text files with ssconvert

ssconvert is a utility shipped with Gnumeric, and it’s a command line spreadsheet converter.

Let’s say that you have some data in a spreadsheet (eg[……]

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Author AndreaPosted on January 25, 2017January 31, 2017Categories How To, Programming, TipTags BashLeave a comment on Converting spreadsheets to text files with ssconvert

Firefox – prevent websites from refreshing

Fed up with websites/tabs continuously reloading themselves and using resources unnecessarily?
Me too!

In firefox, you can disable this from the a[……]

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Author AndreaPosted on November 15, 2016January 26, 2017Categories TipTags Firefox, Web2 Comments on Firefox – prevent websites from refreshing

How to update all docker base images with one command

for docker in $(docker images|awk '{print $1,$2}'|sed 's/ /:/g'|grep -v REPOSITORY); do docker pull $docker; done

This command updates all your[……]

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Author AndreaPosted on October 4, 2016January 26, 2017Categories How To, Programming, TipTags Bash, Docker, Linux, One-linerLeave a comment on How to update all docker base images with one command

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