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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 following example here was the situation. $ lsof +L1 COMMAND PID USER FD TYPE DEVICE
Read MorePart 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 a list of files to search The Problem However, in this conundrum, when I would
Read MoreFor 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 provides a trough of information regarding Linux Memory Management. The original document prints out at
Read MoreThere 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”
Read MoreEncountered 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 big fan of looking thru the Linux pseudo filesystem in /sys In this instance I
Read MoreTo 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
Read MoreThere 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 is a way to use an alternate installation ‘root’ directory so that you can ensure
Read MoreSometimes 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 accordingly if you want to view wifi and ethernet adapters and exclude any bridge or
Read MoreGot 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 problem.. Good IPO Bad IP However.. What if am gathering user input via script and
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