collection of hints for the easier use of cygwin

Written by marcelpetrick on June 14, 2017

some better package-manager than via that set-up.exe: apt-cyg!
url: https://github.com/transcode-open/apt-cyg
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make shell-scripts runnable under Win (7):
add to the first line after “#!/bin/bash”

(set -o igncr) 2>/dev/null && set -o igncr;

1	(set -o igncr) 2>/dev/null && set -o igncr;

else you get the error message that “\r” is not a command … ha
=================================================
how to use proxy for firewalled use:

export http_proxy=http://username:password@host:port/

1	export http_proxy=http://username:password@host:port/

Maybe more will be added. All just small, but fixing tricky

shell-script to clean a project

Written by marcelpetrick on June 14, 2017

I like to decorate the code with some debugging-messages, explicit variables, etc. while developing a feature or fixing a bug. Problem is that other team-members will not like that (or the amount ;)).
So, I commit the current state with Git and then remove all lines marked with the comment “// todoM”. Since this some non-creative work, why not automate it?

Code for the bash-script now on github: https://github.com/marcelpetrick/cleanMyCode 🙂

Further improvements like massive parallelization planned!

edith 20170619:
The fourth version relies now on some exported bash-function, so that GNU parallel can be used to speed up the process by parallelizing the search&replace inside the file- (-list given by find).
This helps, just I/O is now the bottleneck. CPU-speed not.
But I’ve always wanted to experiment with “parallel” and see how to use this. I should improve the “contactSheet”-script as well. Or the cat-cam-script .. endless opportunities ..

Get rid of the master-branch @ github

Written by marcelpetrick on October 30, 2016

issue:

$ git push origin --delete master
Username for 'https://github.com': marcelpetrick
Password for 'https://marcelpetrick@github.com': 
To https://github.com/marcelpetrick/PiCamGifForTumblr.git
 ! [remote rejected] master (refusing to delete the current branch: refs/heads/master)
error: failed to push some refs to 'https://github.com/marcelpetrick/PiCamGifForTumblr.git'

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$ git push origin --delete master

Username for 'https://github.com': marcelpetrick

Password for 'https://marcelpetrick@github.com':

To https://github.com/marcelpetrick/PiCamGifForTumblr.git

! [remote rejected] master (refusing to delete the current branch: refs/heads/master)

error: failed to push some refs to 'https://github.com/marcelpetrick/PiCamGifForTumblr.git'

solution:

create a fake branch and push it
go to github > $your_repo > settings > branches > default branch and make the fake branch the current one
delete master
push new master
revert the default branch

share a folder via SMB on CLI

Written by marcelpetrick on October 23, 2016

The missing counter-part for this post.

create new smb-user pi: “$ sudo smbpasswd -a pi“
create directory: “$ mkdir freigabeATminipc“
set rights: “$ sudo chmod 770 freigabeATminipc/“
edit config: “$ sudo nano /etc/samba/smb.conf”
add at end of the file the following and save-quit (CTRL+X; y)

[freigabeATminipc]
   comment = for sharing
   path = /home/pi/Desktop/freigabeATminipc
   valid users = pi
   browseable = yes
   read only = no
   guest ok = yes

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[freigabeATminipc]

comment = for sharing

path = /home/pi/Desktop/freigabeATminipc

valid users = pi

browseable = yes

read only = no

guest ok = yes

restart: “$ sudo service smbd restart“
check if everything fits: “$ testparm“

mount a smb-share (not via fstab!)

Written by marcelpetrick on October 7, 2016

Don’t know how often I did this on several systems and still always(!) have to pick the parameters.

$ sudo apt-fast install samba samba-common smbclient cifs-utils
$ mkdir freigabeATminipc
$ sudo mount -t cifs -o user=guest //MINIPC/freigabe freigabeATminipc/

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$ sudo apt-fast install samba samba-common smbclient cifs-utils

$ mkdir freigabeATminipc

$ sudo mount -t cifs -o user=guest //MINIPC/freigabe freigabeATminipc/

Check for available shares in the network via “smbtree”.

Estimate quickly the ‘size’ of the project

Written by marcelpetrick on August 9, 2016

Nothing in comparison to SLOCCount or other tools, but sometimes you just need a ‘value‘ 😉

find . -regex ".*\.\(h\|cpp\)" | sort | xargs wc -l

1	find . -regex ".*\.$h\\|cpp$" \| sort \| xargs wc -l

103 ./main.cpp 90 ./map.cpp 35 ./map.h 63 ./mapitem.cpp 29 ./mapitem.h 122 ./mapprocessor.cpp 27 ./mapprocessor.h 79 ./mapreader.cpp 23 ./mapreader.h 571 total

edith 20160819: sort the result before counting for a much nicer appearance 😉

weather-forecast without annoying advertisments

Written by marcelpetrick on May 18, 2016

curl http://wttr.in/hamburg

1	curl http://wttr.in/hamburg

Sounds from the underground

Written by marcelpetrick on May 7, 2016

Found a one-liner which uses input from urandom to create music. And: I’ve experienced worse musical accentuation in games xD

cat /dev/urandom | hexdump -v -e '/1 "%u\n"' | awk '{ split("0,2,4,5,7,9,11,12",a,","); for (i = 0; i < 1; i+= 0.0001) printf("%08X\n", 100*sin(1382*exp((a[$1 % 8]/12)*log(2))*i)) }' | xxd -r -p | aplay -c 2 -f S32_LE -r 16000

1	cat /dev/urandom \| hexdump -v -e '/1 "%u\n"' \| awk '{ split("0,2,4,5,7,9,11,12",a,","); for (i = 0; i < 1; i+= 0.0001) printf("%08X\n", 100sin(1382exp((a[$1 % 8]/12)log(2))i)) }' \| xxd -r -p \| aplay -c 2 -f S32_LE -r 16000

Original source is that blog. Also offers explanations and how to tune the scale. Great!

Procrasticoding: annotate animated GIFs (or even add a picture/watermark)

Written by marcelpetrick on April 20, 2016

The sun rose, the cats were watching the birds on the windowsill and at first I just wanted to take a cute picture of them sitting soo close, but then I had another inspiration ..

0. Prepared the logo from some internetsearch; stripped of colors, converted to 3-color-GIF with transparency: all done by GIMP and some magic.
1. converted the video to GIF with greyscaling and resizing
2. merged the two pictures while optimizing the layers and applying some contrast

ffmpeg -i VID_20160420_061216.mp4 -vf scale=320:180 -strict -2 -vf format=gray video_gray.mp4 && \
ffmpeg -i video_gray.mp4 -t 3 -b:v 1024k -vf scale="320x180" gray320.gif && \
convert gray320.gif -contrast -coalesce -gravity SouthWest -draw 'image Over 0,0 0,0 "leben2.gif"' -layers Optimize combined320.gif

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ffmpeg -i VID_20160420_061216.mp4 -vf scale=320:180 -strict -2 -vf format=gray video_gray.mp4 && \

ffmpeg -i video_gray.mp4 -t 3 -b:v 1024k -vf scale="320x180" gray320.gif && \

convert gray320.gif -contrast -coalesce -gravity SouthWest -draw 'image Over 0,0 0,0 "leben2.gif"' -layers Optimize combined320.gif

BTW: sometimes empty phrase-error messages spark my fury … “convert.im6: non-conforming drawing primitive definition `image’ @ error/draw.c/DrawImage/3158.
” … and what does this tell me now?!?
But at least I am not the first one who understood nothing! Thank you.

doEis.sh: convert all negatives via negfix8

Written by marcelpetrick on April 15, 2016

reason: too lazy to call the negfix8-script for each file itself. Because conversion is fast but even with an SSD writing the ~120 MiByte files takes some time. Precious time ..

#!/bin/bash

# author:	Marcel Petrick (mail@marcelpetrick.it)
# date:		20160415
# license:	GNU General Public License, version 2 ( http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html )

echo "############################ start of the script ############################"

#handle the issue with filenames with spaces
SAVEIFS=$IFS
IFS=$(echo -en "\n\b")

#needed for the call of negfix8
SKRIPTDIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )

ALLFILES=`ls *.tif` #get all files inside the current folder which fit by suffix

WORKINGDIR="negfix8Output"
#todo: maybe add a check if the directory already existed ..
mkdir $WORKINGDIR

for FILE in $ALLFILES
do
	CLEANEDNAME="${FILE// /_}" #also alter the original-input-name by replacing all spaces
	echo "will work now on #$FILE# and save as #$CLEANEDNAME#" #print current file name

	FULLPATH=$WORKINGDIR"/"$CLEANEDNAME".png"
	#convert
	/bin/bash $SKRIPTDIR/negfix8.sh -cs $FILE $FULLPATH
done

printf "############################ end of the script ############################\n"

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#!/bin/bash

# author: Marcel Petrick (mail@marcelpetrick.it)

# date: 20160415

# license: GNU General Public License, version 2 ( http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html )

echo "############################ start of the script ############################"

#handle the issue with filenames with spaces

SAVEIFS=$IFS

IFS=$(echo -en "\n\b")

#needed for the call of negfix8

SKRIPTDIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )

ALLFILES=`ls *.tif` #get all files inside the current folder which fit by suffix

WORKINGDIR="negfix8Output"

#todo: maybe add a check if the directory already existed ..

mkdir $WORKINGDIR

for FILE in $ALLFILES

do

CLEANEDNAME="${FILE// /_}" #also alter the original-input-name by replacing all spaces

echo "will work now on #$FILE# and save as #$CLEANEDNAME#" #print current file name

FULLPATH=$WORKINGDIR"/"$CLEANEDNAME".png"

#convert

/bin/bash $SKRIPTDIR/negfix8.sh -cs $FILE $FULLPATH

done

printf "############################ end of the script ############################\n"

ps. ‘do eis’ is latin, not some german-english mumble jumble.

solutions; not code

Bash