Category Archives: Linux

Using grep to search a file using multiple words as boolean AND OR condition

Posted on September 10, 2024 by dsg_admin
Posted in Command Line FU, Linux, Uncategorized | Comments Off on Using grep to search a file using multiple words as boolean AND OR condition

Viewing contents of an open filehandle on a deleted file

Posted on May 1, 2024 by dsg_admin

There are times when you may unintentionally delete a file which is being written to. When this occurs it will leave an Open Filehandle. In Linux open filehandles may be viewed via the ‘lsof’ command. # lsof +L1 In the … Continue reading →

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Cscope search results are invisible

Posted on February 13, 2024 by dsg_admin

Part of my ‘day job’ is trolling thru source code when looking for answers. My preferred mechanism, other than a recursive grep, is to use cscope Cscope is a useful tool for searching a source code tree after you build … Continue reading →

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What every Programmer *should* know about Memory

Posted on October 4, 2023 by dsg_admin

For my fellow Insomniacs out there… If you are up scrolling your phone for things around the Google-verse to read to shut off your brain so you can possibly go to sleep.. I came across this article on LWN which … Continue reading →

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Obtain the grub boot parameters from /var/log/messages

Posted on September 20, 2023 by dsg_admin

There are times you may need to quickly confirm the grub boot parameters that were issued either at the console (or by default) This information is logged to /var/log/messages when you grep with keywords “Kernel command”

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Display ethernet devices on a Fedora system using the Linux Pseudo Filesystem and create a static IP Address

Posted on September 11, 2023 by dsg_admin

Encountered a fun riddle recently whereby on a Fedora 34 system I needed to locate all ethernet interfaces on a system that are obtaining a DHCP address, then after the first reboot create a static IP address. I am a … Continue reading →

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Modify gnome dock from the command line

Posted on September 8, 2023 by dsg_admin

To modify the gnome desktop dock (i.e. launcher or launchpad) from the command line an easy way is to perform the following: This above will add Firefox, The File Manager, Terminal, Terminator and Gnome Settings to the desktop

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Downloading an RPM package including all of its dependencies on Fedora

Posted on September 8, 2023 by dsg_admin

There are times when you need to fully download an RPM and all of its dependencies. However, If you have already downloaded the RPM re-downloading the RPM and all its dependencies can be very difficult. I have found the following … Continue reading →

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List only ethernet Network Adapters on Debian/Fedora

Posted on September 7, 2023 by dsg_admin

Sometimes you want a quick way to verify all ethernet network adapters that are seen by the kernel at boot time. I find going directly to the pseudo filesystem is the fastest. For example. Similarly, you an modify the egrep … Continue reading →

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Remove any potential special characters or spaces from an IP address using AWK

Posted on July 12, 2023 by dsg_admin

Got stuck earlier in an interesting regex mystery and I command-line FU’d an AWK Solution. PROBLEM I want to strip out all spaces and/or special characters from an IP address PROCESS I know how to validate an IP address no … Continue reading →

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