Which filesystems are we talking about? ZFS, BTRFS Why is fragmentation bad? It causes performance issues. Specifically bandwidth and more importantly latency. For Virtualized environments, you want the lowest latency as possibleRead More…

If your using find to its max extent, by using it as a selector tool of wide versatility, then your on the right path. Find is one of the strongest tools inRead More…

CAVEAT: you can do the same thing with “lsof” and “fuser” So you want to see the current files being copied or looked at by cp or rsync (or another program)? So youRead More…

BSDTAR vs TAR This site pretty much sums it up really well: http://unix.stackexchange.com/questions/101561/what-are-the-differences-between-bsdtar-and-gnu-tar Note that tar has the ability to use -a or autocompress. In some versions of bsdtar you also get -a.Read More…

When working with the key * with BASH, becareful. And simply try to avoid it when you can. * usually does not select hidden files. Unless you tell it other wise withRead More…

Find Largest Files and directories ### CHEATSHEET ALL OF THESE OPERATE INTO CURRENT DIRECTORY: ### # One command, one liner per line. du -a . | sort -n -r | head -nRead More…

I got it from Nixcraft article here, so here is the source: http://www.cyberciti.biz/faq/how-do-i-find-the-largest-filesdirectories-on-a-linuxunixbsd-filesystem/ I mention this method in finding largest files articles (also sourced from above link):  Largest Files It looks like this: forRead More…

Monitor pinging multiple targets using the below script (sends 4 pings to each target, one after the other). read the comments for more details (how the output looks like etc.) Make theRead More…

alias dud='du -chd 1' alias dud2='du -chd 2' alias dud3='du -chd 3' alias dud4='du -chd 4' alias duds='du -chd 1 | sort -h' alias duds2='du -chd 2 | sort -h' alias duds3='duRead More…