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Adjust disk space used by journal in linux

Software Effect Enterprises, Inc Posted on April 6, 2025 by SEEIApril 6, 2025

You can diminish the size of the journal by means of these commands: sudo journalctl –vacuum-size=100M This will retain the most recent 100M of data. sudo journalctl –vacuum-time=10d will delete everything but the last 10 days. The above commands are … Continue reading →

Posted in Linux | Tagged journal, journald, linux

Add dummy network interface to Linux

Software Effect Enterprises, Inc Posted on January 16, 2025 by SEEIJanuary 16, 2025

There are many reasons why you would do this, most of which are for testing and learning. Not going to go into why – just going to do it. nmcli con add type dummy ifname dummy0 con-name dummy0 ipv4.address 10.101.101.1/24 … Continue reading →

Posted in Fedora, Linux | Tagged dummy, linux, network

smbclient mget

Software Effect Enterprises, Inc Posted on January 5, 2025 by SEEIJanuary 5, 2025

smbclient \\\\server\\sharename password -Uusername -c “prompt;mget *”

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Posted in Linux, Samba, Windows | Tagged smb, smbclient

Crontab time format

Software Effect Enterprises, Inc Posted on August 12, 2024 by SEEIAugust 12, 2024

|——————————- Minute (0-59) |     |————————- Hour (0-23) |     |     |——————- Day of the month (1-31) |     |     |     |————- Month (1-12; or JAN to DEC) |     … Continue reading →

Posted in Fedora, Linux | Tagged cron, crontab, format, time

tftp and firewall-cmd

Software Effect Enterprises, Inc Posted on February 23, 2024 by SEEIJune 9, 2025

Update –  I installed fedora 41 and my original fix below did not work any more New fix firewall-cmd –permanent –new-policy tftp-client-data firewall-cmd –permanent –policy tftp-client-data –add-ingress-zone HOST firewall-cmd –permanent –policy tftp-client-data –add-egress-zone ANY firewall-cmd –permanent –policy tftp-client-data –add-service tftp … Continue reading →

Posted in Linux, tftp | Tagged firewall-cmd, firewalld, tftp

Set time format to 24 hours at shell prompt

Software Effect Enterprises, Inc Posted on September 5, 2023 by SEEISeptember 5, 2023

You type in date on your linx box and you get Tue Sep 5 5:08:49 PM CDT 2023 but you want it to read Tue Sep 5 17:08:49 CDT 2023 To make that happen execute localectl set-locale LC_TIME=”C.UTF-8″ Log off, … Continue reading →

Posted in Linux | Tagged 24, format, hour, linux, time

Throttle processor speed in Linux

Software Effect Enterprises, Inc Posted on August 28, 2023 by SEEIAugust 28, 2023

I have a system that runs in a environment that tends to be on the warm side. If the processor starts running at 3Ghz or higher, the processor starts some serious overheating. Applications I have running on this system do … Continue reading →

Posted in Fedora, Linux | Tagged cpu, fedora, frequency, linux, speed

imjournal: filecreatemode is not set

Software Effect Enterprises, Inc Posted on August 7, 2023 by SEEIAugust 7, 2023

You find the following line in your messages file  imjournal: filecreatemode is not set, using default 0644 This is not a critical error. To eliminate this message edit /etc/rsyslog.conf and find the line module(load=”imjournal” fileCreateMode=”644″ StateFile=”imjournal.state”) note it might be … Continue reading →

Posted in Fedora, Linux | Tagged filecreatemode, imjournal

nmap quick reference

Software Effect Enterprises, Inc Posted on June 4, 2023 by SEEIJune 4, 2023

Quick Network Scan nmap -sn 192.168.0.0/24 OS detection with verbosity (-O -v) nmap -O -v 192.168.0.0/24 OS detection with verbosity and version scan (-sV -O -v) nmap -sV -O -v 192.168.0.0/24 Rogue DHCP server discovery nmap –script broadcast-dhcp-discover -e bond0 … Continue reading →

Posted in Linux | Tagged nmap

ssh session time out / dropping

Software Effect Enterprises, Inc Posted on April 6, 2023 by SEEIApril 6, 2023

You ssh to some remote system (usually across the internet) step away from your keyboard for a few minutes, and the session gets dropped. The problem may be resolved by sending more keep alive packets You can fix this by … Continue reading →

Posted in Linux, ssh | Tagged ssh, timeout

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