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Using egrep to search multiple patterns.
This is the most straightforward approach: first regexp limits dictionary file to words with thirteen or more characters, second regexp discards any words that have a letter repeated. (Bonus challenge: Try doing it in a single regexp!)
Its possible to user a simple regex to extract de username from the finger command.
The final echo its optional, just for remove the initial space
Thx Mass1 for the sharing
A grep against ethtool to look for common errors and packet loss statistics which network drivers report in their private data, which is queried with ethool -S. This is the current grep used in xsos (https://github.com/ryran/xsos), which I originally contributed and has been improved by the community over time.
Filter entries in OpenSuse /var/log/messages like:
timestamp servername kernel: [83242.108090] btrfs: checksum error at logical 1592344576 on dev /dev/sda5, sector 5223584, root 5, inode 2652, offset 282624, length 4096, links 1 (path: log/warn)
Puts a splash of color in your access logs. IP addresses are gray, 200 and 304 are green, all 4xx errors are red. Works well with e.g. "colorize access_log | less -R" if you want to see your colors while paging.
Use as inspiration for other things you might be tailing, like syslog or vmstat
tail -f access.log | colorize
Is the better option on a Open SuSE Box
This will strip out the relivent disk information from kvm. I'm using it to find disks on a SAN which are no longer in use.
Backs up all databases, excluding test, mysql, performance_schema, information_schema.
Requires parallel to work, install parallel on Ubuntu by running: sudo aptitude install parallel
I used this to get all the remote connection ip addresses connected to my server... I had to start storing and tracking this data so thats why i built this out... probably not optimal as far as the egrep regex but it works ;)
UBNT iwlist command
This one has a better performance, as it is a one pass count with awk. For this script it might not matter, but for others it is a good optiomization.
make usable on OSX with filenames containing spaces. note: will still break if filenames contain newlines... possible, but who does that?!
Enhanced version: fixes sorting by human readable numbers, and filters out non MB or GB entries that have a G or an M in their name.
Uses the formatting of a man page to show an outline of its headers and sub-headers.