Commands by slmingol (1)

What's this? is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Create a mirror of a local folder, on a remote server
Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Edit your command in vim ex mode by <ctrl-f>
If you are in ex mode in vim i.e. you've pressed ':'. You can edit the current command by pressing <ctrl-f>

a function to find the fastest DNS server 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.

Get the canonical, absolute path given a relative and/or noncanonical path
readlink -f accepts a relative, noncanonical path and emits the corresponding canonical, absolute path.

Convert PNG to GIF
(relies on 'imagemagick') Convert all .png files to .gif. This can also go the other way if you reverse the file extensions in the command, e.g.: $ for file in *.gif; do convert "$file" "$(basename $file .gif).png"; done If the file is named 'example1.png' it will be named 'example1.gif' when it is complete.

bash auto-complete your screen sessions
this bash command sets it so that when you type "screen ", it searches your running screens, and present valid auto-complete choices. The output is . Note: You must have programmable completion enabled. Check with "shopt progcomp", set with "shopt -s progcomp"

Convert JSON to YAML
Convert JSON to YAML. Note that you'll need to have PyYaml installed.

clear current line

grep по ps aux

Display the standard deviation of a column of numbers with awk
This will calculate a running standard deviation in one pass and should never have the possibility for overflow that can happen with other implementations. I suppose there is a potential for underflow in the corner case where the deltas are small or the values themselves are small.

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