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Close specify detached screen
-X Send the specified command to a running screen session. -S Option to specify the screen session if you have several screen sessions running. $screen -ls for listing current screens and its sessionname

syncronizing datas beetween two folder (A and B) excluding some directories in A (dir1 and dir2)

Check the status of a network interface
no need for installing mii-tools, all generic tools working under archlinux.

list block devices
Shows all block devices in a tree with descruptions of what they are.

list files recursively by size

Convert all JPEG images to MP4
Source: http://superuser.com/a/624574

Number of CPU's in a system
/proc/cpuinfo contains information about the CPU. Search for "processor" in the /proc/cpuinfo file wc -l, counts the number of lines.

Show numerical values for each of the 256 colors in bash
Same as http://www.commandlinefu.com/commands/view/5876, but for bash. This will show a numerical value for each of the 256 colors in bash. Everything in the command is a bash builtin, so it should run on any platform where bash is installed. Prints one color per line. If someone is interested in formatting the output, paste the alternative.

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Listing today’s files only


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