Command Line Magic

printf "now- %d days\n" {1..332044} | date -f- +"%Y%m%d %m%d%Y %d%m%Y" | perl -ne 'chomp;@d=split(/ /);$all3=1;for($i=0;$i<3;$i++){ if ($d[$i] ne reverse($d[$i])){$all3=0} }; if($all3 == 1) {print "$_\n";}' # Verify first alignment of ZERO PADDED palindates across three formats.

This one had some assistance from the fine folks in the http://irc.freenode.org  #climagic channel. I wanted to avoid having to fork a bunch of comparisons. Batch processing the dates, reversals and comparisons is much faster.

printf "now - %d days\n" {1..332044} |date -f- +%Y%_m%_d$'\n'%Y%m%d |tr -d ' ' > alldates.txt; rev alldates.txt >revdates.txt; paste alldates.txt revdates.txt |awk '$1==$2{print $1}' # Show that there have been several palindrome dates between now and 1111AD. Zero padded or not.

openssl s_client -connect http://www.office.com:443  -servername http://www.office.com  </dev/null 2>/dev/null |openssl x509 -noout --checkend 86400 # Check if the SSL certificate for a website is going to expire in less than a day.

python3 -m http.server 8080 # Start a simple webserver using python3 on external port 8080 and use the current directory you are in as the document root. Be careful with what you expose to the world. Use --bind 127.0.0.1 if you want to make it local only.

unzip -d ~/3Dprinter -j Something\.zip 'files/*' -d ~/3Dprinter/ # This will unzip just the files within the files folder inside the zip file and put them in your ~/3Dprinter/ directory without making the files subfolder. Good for Thingiverse files. Make a function for it too.

Funny options (xmms2d): --yes-run-as-root Give me enough rope to shoot myself in the foot

xsel -b | sed 's/2019/2020/g' | xsel -b # Replace all instances of 2019 with 2020 in your X windows copy buffer. Mac users can use pbpaste and pbcopy instead.

If I got paid for the unsuccessful commands, I'd be richer than Bill Gates because $? would be > 0. You don't have to get them right all the time, just make sure to have good backups.

Which even if you're not doing this visualization you should be doing anyways or just turn off root logins altogether.

grep -l -r 155.62.259.52 /etc # If you're just looking for the files where an IP might be referenced and not the countless lines that might come up, use grep's -l option to just get the list of files.

qalc "145Gbyte / 1.5Mibit/second to day" # How many days will it take to transfer 145GB (base 10 bytes) at 1.5Mibits/sec (base 2)? You can use qalc for that!