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View dmesg output in human readable format

a function to find the fastest DNS server
http://public-dns.info gives a list of online dns servers. you need to change the country in url (br in this url) with your country code. this command need some time to ping all IP in list.

grep apache access.log and list IP's by hits and date - sorted

Extract track 9 from a CD
Using mplayer to extract audio file from a CD

Send email with curl and gmail
Required curl version >=7.21; using ~/.netrc for authorization

VIM: Replace a string with an incrementing number between marks 'a and 'b (eg, convert string ZZZZ to 1, 2, 3, ...)

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" }

Bind a key with a command
the -x option is for binding to a shell command

Quick searching with less

List the size of all sub folders and files from the current location, with sorting


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