Commands by evilsoup (3)

  • Batch resize images (overwriting)

    Requires ImageMagick to be installed; mogrify is the lesser-known sibling to convert -- it overwrites your original images, but allows you to work on batches of files without resorting to a loop.


    0
    mogrify -resize 852x480 ./*.png
    evilsoup · 2013-12-24 12:42:06 11
  • Command to rename multiple file in one go

    An entirely shell-based solution (should work on any bourne-style shell), more portable on relying on the rename command, the exact nature of which varies from distro to distro.


    3
    for f in ./*.xls; do mv "$f" "${f%.*}.ods"; done
    evilsoup · 2013-09-17 01:41:56 6
  • Delete all empty lines from a file with vim

    Here's the other way of doing it in vim: setting a recursive macro. 'gg' brings you to the top of the buffer, 'qqq' clears the 'q' macro, 'qq' starts recording a macro called 'q', '/^$' moves the cursor to the next empty line, 'dd' deletes the line that the cursor is on, '@q' calls the 'q' macro (currently empty because of 'qqq'), and 'q' stops recording the macro. '@q' calls the macro. It will run until it cannot find another blank line, at which point it will throw up an error and cease. While this is longer than the regex, you can use it without having to move your thoughts from 'vim-mode' to 'regex-mode'.


    -2
    ggqqqqq/^$dd@qq@q
    evilsoup · 2013-08-16 20:37:44 8

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Blackhole any level zones via dnsmasq
Explanation It creates dnsmasq-com-blackhole.conf file with one line to route all domains of com zones to 0.0.0.0 You might use "address=/home.lab/127.0.0.1" to point allpossiblesubdomains.home.lab to your localhost or some other IP in a cloud.

shuffle lines via perl
Same, without modules... Probably smarter option: just use the shuf command or even sort -R.

Function to check whether a regular file ends with a newline
tail -c 1 "$1" returns the last byte in the file. Command substitution deletes any trailing newlines, so if the file ended in a newline $(tail -c 1 "$1") is now empty, and the -z test succeeds. However, $a will also be empty for an empty file, so we add -s "$1" to check that the file has a size greater than zero. Finally, -f "$1" checks that the file is a regular file -- not a directory or a socket, etc.

Delete all but the latest 5 files, ignoring directories

scping files with streamlines compression (tar gzip)
it compresses the files and folders to stdout, secure copies it to the server's stdin and runs tar there to extract the input and output to whatever destination using -C. if you emit "-C /destination", it will extract it to the home folder of the user, much like `scp file user@server:`. the "v" in the tar command can be removed for no verbosity.

Get AWS temporary credentials ready to export based on a MFA virtual appliance
You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

pipe output to notify-send
Route output to notify-send to show nice messages on the desktop, e.g. title and interpreter of the current radio stream

Change host name
With sed you can replace strings on the fly.

The scene in the Shining (Stanley Kubrick)
Let's take a rest. How about watch a horror? The Shining http://en.wikipedia.org/wiki/The_Shining_(film)

Get the number of days in a given month and year

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