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watch iptables counters
Watch the number of packets/bytes coming through the firewall. Useful in setting up new iptables rules or chains. Use this output to reorder rules for efficiency.

Find the package that installed a command

check open ports without netstat or lsof

Skip filenames with control characters, a.k.a tab,newline etc

Find all dotfiles and dirs
find makes it easier, filtering . and .. maxdepth could be removed, finding entries recursively. Removing mindepth causes . to appear

Remove everything except that file
it will remove everything except the file names matching you can use also use wildcards

SVN Command line branch merge
This will merge all of the changes from {rev_num} to head on the branch to the current working directory

Tail a log-file over the network
This one is tried and tested for Ubuntu 12.04. Works great for tailing any file over http.

sort the contents of a text file in place.
sorts the contents of a file without the need for a second file to take the sorted output. This was previously entered as `sort -g list.txt -o $_` but as others have pointed out the $_ references the previous command. so this would've worked had that been the second part of a command joined with && like: cat list.txt && sort -g list.txt -o $_ The user below me Robin had the most correct command.

Mirror a directory structure from websites with an Apache-generated file indexes
wget/curl/friends are not good with mirroring files off websites, especially those with Apache-generated directory listings. These tools endlessly waste time downloading useless index HTML pages. lftp's mirror command does a better job without the mess.


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