I have a file like the following this thing that thing this stuff that stuff I want it to read this thing that thing this stuff that stuff To fix it cat file.txt | sed ‘N;s/\nthat/ that/g’
Continue reading →I have a fedora machine set up to backup configs and information from other servers via scp. In the daily log watch report I am getting tons of Received disconnect from some.ip.add.ress port someport:11: : 1 Time For some reason … Continue reading →
Instead of: [fu@bar ~]$ history … 990 nmap 10.9.6.0/24 991 history 992 less ~/.bash_history 993 ls -ltra 994 less ~/.lesshst 995 cd .config/ 996 ls -ltra 997 exit 998 ssh webserver 999 exit 1000 history Do this: [fu@bar ~]$ export … Continue reading →
A quick synopsis on setting up a Cisco ASA and a Centos 6 or 7 system to use SNMP v3 to be monitored by Cacti Cisco ASA en conf t # create a snmp-server group (needed for SNMP v3) # … Continue reading →
You want to set up a crontab where something happens every weekday morning, i.e. 8 am every Monday, Tuesday, Wednesday, Thursday, and Friday in January from the 10th to the 30th. You set up your crontab with the following 0 … Continue reading →
If you have a few .img files coming as disk images from devices like floppies, CDs, DVDs, SD cards, etc, you will realize that you cannot mount the in Linux, because they contain a file system that has to be … Continue reading →
I have a few boxes that have built in wifi and I dont need it turned on. So I turn it off using the following command nmcli radio wifi off To make sure the wifi radio stays turned off in … Continue reading →
I have found the following two sites helpful in finding issues with the configuration of SSL secured web sites https://ssltools.digicert.com/checker/ https://www.ssllabs.com/ssltest/analyze.html Test which ciphers (TLS, SSL, etc) are enabled nmap -sV –script ssl-enum-ciphers -p 443 www.yourdomain.com Ref: https://nmap.org/nsedoc/scripts/ssl-enum-ciphers.html
Continue reading →If you need email delivered to a specific server for selected domains you do the following: As root, edit the /etc/postfix/main.cf. Find (or add) the line that starts with transport_maps= If it does not exist, add the line “transport_maps=hash:/etc/postfix/transport. If … Continue reading →
Running ssh across a vpn connection I started having my ssh sessions fail to connect. After starting ssh with the “-vvv” option, the session would timeout after getting a debug1: expecting SSH2_MSG_KEX_ECDH_REPLY After doing some research, I found other people … Continue reading →