Commands using rm (301)

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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" }

Shows size of dirs and files, hidden or not, sorted.
Very useful when you need disk space. It calculates the disk usage of all files and dirs (descending them) located at the current directory (including hidden ones). Then sort puts them in order.

fix broken permissions

View facebook friend list [hidden or not hidden]
There's no need to be logged in facebook. I could do more JSON filtering but you get the idea... Replace u=4 (Mark Zuckerberg, Facebook creator) with desired uid. Hidden or not hidden... Scary, don't you?

List Network Tools in Linux
Get all the networking related commands for your distro

Prepend text to a file

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Rename files in batch

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.

send echo to socket network
this command will send a message to the socket 25 on host 192.168.1.2 in tcp. works on udp and icmp understand only IP address, not hostname. on the other side (192.168.1.2), you can listen to this socket and test if you receive the message. easy to diagnose a firewall problem or not.


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