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Mirror rubygems.org
https://github.com/rubygems/rubygems-mirror/issues/20

Convert seconds to [DD:][HH:]MM:SS
Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Get all IPs via ifconfig

Recursive grep of all c++ source under the current directory
I like this better than some of the alternatives using -exec, because if I want to change the string, it's right there at the end of the command line. That means less editing effort and more time to drink coffee.

Query well known ports list
Uses the file located in /etc/services

Apache memory usage

Get backup from remote host, then expand in current directory using tar

generate random mac address

remove accented chars

Search for in which package the specified file is included.


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