I wanted to learn Bella Ciao on my Concertina. I find the sound of the Concerina fitting the tune. So i used vi and conversion tools to create a pdf for my concertina tunebook.
(While being popular nowadays because it was used in La Casa de Papel (Money Heist). It has a interesting history) https://en.wikipedia.org/wiki/Bella_ciao
X:
T: Bella Ciao
M: 4/4
L: 1/8
R: reel
K:C
Zz EAB | cA-A z EAB | cA-A z EAB | c2 BA c2 BA |
e2 e2 eede | ff-f2 z fed | | fe-e z edc | B2 e2 c2 B2 |
A4 z z de | ff-f2 z fed | fe-e2 z edc | B2 e2 c2 B2 |
w: "repeat\ from\ beginning"
A4 z EAB | cA-A z EAB | cA-A z EAB | c2 BA c2 BA |
e2 e2 e2 de | ff-f2 z fed | fe-e z edc | B2 e2 c2 B2 |
A4 z EAB | cA-A z EAB | cA-A z EAB | c2 BA c2 BA |
e2 e2 eede | ff-f2 z fed | fe-e2 z edc | B2 e2 c2 B2 |
A4 z ede | ff-f2 z fed | fe-e2 z edc | B2 e2 ^f2 ^g2 | a4 Zz |
I’ll probably automate this, for example include this in the tunebook generator. Something like : “If abc file in subdir create pdf to include”
# Reads every file in abcsources and writes filename.pdf in current directory
ls abcsources/*abc | while read abc ; do abcm2ps -x -O - "$abc" | ps2pdf -sPAPERSIZE=a4 - "$(echo $abc | cut -f2 -d/ | sed 's/abc/pdf/g')" ;done
I have several ip cameras which monitor movement in and around our home.
I’m using Zoneminder and other home automation systems but i want to scan through a bunch of files uploaded by the security cameras to my secondary fileserver.
So what is interesting?
Major movement compared to a base image
Movement compared to a previous uploaded image
Setting a threshold when to output information (note the 65% mark)
Looking at the output we see: At 76% of the captured images (image 1438) the threshold was above 3000 and the minus gives us the information of the difference between this image and the previous, the X marks the difference between current image and the baseline. | percent | image number | filename | difference | graphbar
Bash script:
#!/bin/bash
threshold=3000
baseline=$( ls SDAlarm*jpg | head -1)
previous=$( ls SDAlarm*jpg | head -1)
total=$( ls *.jpg |wc -l)
echo "Number of files : $total"
nr=1
ls *jpg | while read; do
graph="....................................................................................................."
diff=$(compare -verbose -metric MAE $baseline $REPLY /dev/null 2>&1 | grep all | awk '{ print $2 }' | cut -f1 -d. )
prevdiff=$(compare -verbose -metric MAE $previous $REPLY /dev/null 2>&1 | grep all | awk '{ print $2 }' | cut -f1 -d. )
line=$( echo "100 / $total * $nr" | bc -l | cut -f1 -d.)
line=$(( $line + 1))
#echo -n "$line | $nr | $REPLY | "
#echo $diff
draw1=$(( $diff / 100 + 1))
draw2=$(( $prevdiff / 100 + 1))
graph=$(echo $graph | sed "s/./X/$draw1")
graph=$(echo $graph | sed "s/./-/$draw2")
if [ $diff -gt $threshold ] ; then
printf "| %4s %% | %3s | %30s | %5s | %102s \n" $line $nr $REPLY $diff $graph
fi
nr=$(( $nr +1 ))
previous=$REPLY
done
Want to see only difference with previous image?
change:
if [ $diff -gt $threshold ] ; then into if [ $prevdiff -gt $threshold ] ; then
We take a lot of pictures, with our Nikon camera and our mobile phones.
(Apparently in 2019 5544 pictures)
Some stats
757 20190803 - on a single day (Holiday)
Average pictures per month
locate "/2019/" | egrep -i "photoalbum|gsm" | egrep -i "mp4$|jpg$" | grep -Eo '2[[:digit:]]{3}[[:digit:]]{2}[[:digit:]]{2}' | cut -c-6 |sort | uniq -c | sort -n | awk '{ sum += $1; n++ } END { if (n > 0) print sum / n; }'
461
Besides android pictures being automatically uploaded to our nextcloud, I’m using some apps and scripts to get pictures and movies stored on my fileserver. (bash scripts/andftp)
For sorting those media files, i made a sorting script. (Today I added a location sorting addition using GPS information stored in the exif information.
jpg and jpeg (add your own extentions)
mp4 and mov (for mobile and nikon)
Sorts by camera model/year/date/location
tries to extract date from filename when not found in exifinfo
Sorts whatsapp media
Sorts Raw
INSTALLING
pip3 install reverse_geocoder You need python3, exiftool, exiftime and mediainfo
copy below python script in ~/bin/reverse2.py
( need more info? change last print entry admin1/admin2) [{‘lat’: ‘-39.45556’, ‘lon’: ‘173.85833’, ‘name’: ‘Opunake’, ‘admin1’: ‘Taranaki’, ‘admin2’: ‘South Taranaki District’, ‘cc’: ‘NZ’}]
#!/bin/bash
#set -x
reversepath=/home/henri/projects/reversegeo/reverse2.py
#RAW
rawcnt=`ls | grep -i nef$ | wc -l`
if [ "$rawcnt" = "0" ] ; then
echo "no raw"
else
mkdir raw 2>/dev/null
ls | grep -i nef$ | while read ; do mv $REPLY raw ; done
fi
ls | egrep -i "jpg$|jpeg" | while read ; do
location=""
getmodel=$(exiftool "$REPLY" |grep "Make " | awk '{ print $3 }')
if [ "$getmodel" != "" ] ; then
getmodel=$getmodel/
fi
echo "$REPLY" | grep WA0 >/dev/null && getmodel=whatsapp/
gpsinfo=$(exiftool -c "%+.6f" "$REPLY" |grep "GPS Position" | cut -d":" -f2 | tr -d ' ' | sed s/,/\ /g)
if [ "$gpsinfo" != "" ] ; then
location=$(python3 $reversepath $gpsinfo | grep -vi load | sed s/\(NL\)//g)
fi
dater=$(exiftime "$REPLY" 2>/dev/null | egrep "Created|Digitized" | sed s/Digitized/Created/g | tail -1 | cut -c 16-19,21,22,24,25)
if [ "$dater" = "" ] ; then
# echo "Trying from filename"
dater=$(echo $REPLY | grep -Eo '2[[:digit:]]{3}-[[:digit:]]{2}-[[:digit:]]{2}')
if [ "$dater" = "" ] ; then
# echo "Trying from filename - maybe without dashes"
dater=$(echo $REPLY | grep -Eo '2[[:digit:]]{3}[[:digit:]]{2}[[:digit:]]{2}')
fi
fi
if [ "$dater" != "" ] ; then
year=$(echo $dater | cut -c-4)
mkdir -p "${getmodel}$year/${dater}/$location"
mv "$REPLY" "${getmodel}${year}/${dater}/$location"
else
mkdir -p "${getmodel}unknowndate/$location"
mv "$REPLY" "${getmodel}unknowndate/$location"
fi
done
ls | egrep -i "mov$|mp4$" | while read ; do
location=""
getmodel=$(exiftool "$REPLY" |grep "Make " | awk '{ print $3 }')
if [ "$getmodel" != "" ] ; then
getmodel=$getmodel/
fi
echo "$REPLY" | grep WA0 >/dev/null && getmodel=whatsapp/
gpsinfo=$(exiftool -c "%+.6f" "$REPLY" |grep "GPS Position" | cut -d":" -f2 | tr -d ' ' | sed s/,/\ /g)
if [ "$gpsinfo" != "" ] ; then
location=$(python3 $reversepath $gpsinfo | grep -vi load | sed s/\(NL\)//g)
fi
dater=$(mediainfo "$REPLY" | grep Encode | tail -1 | cut -f2- -d: | cut -f3 -d" " | sed s/-//g)
if [ "$dater" = "" ] ; then
# echo "Trying from filename"
dater=$(echo $REPLY | grep -Eo '2[[:digit:]]{3}-[[:digit:]]{2}-[[:digit:]]{2}')
if [ "$dater" = "" ] ; then
# echo "Trying from filename - maybe without dashes"
dater=$(echo $REPLY | grep -Eo '2[[:digit:]]{3}[[:digit:]]{2}[[:digit:]]{2}')
fi
fi
if [ "$dater" != "" ] ; then
year=$(echo $dater | cut -c-4)
mkdir -p "${getmodel}$year/${dater}/$location"
mv "$REPLY" "${getmodel}${year}/${dater}/$location"
else
mkdir -p "${getmodel}unknowndate/$location"
mv "$REPLY" "${getmodel}unknowndate/$location"
fi
done
Example running in a directory with mixed media
# Raw images get moved into a RAW directory
no raw
# Samsung phone detected with date and GPS location
mkdir -p samsung/20220717/Hilversum
mv 20220717_133453.jpg samsung/20220717/Hilversum
# OnePlus phone
mkdir -p OnePlus/20021208/Voorburg
mv IMG_20190109_091825.jpg OnePlus/20021208/Voorburg
# Realme (Added country when not NL)
mkdir -p realme/20220607/Isle of Islay(GB)
mv IMG20220607213630.jpg realme/20220607/Isle of Islay(GB)
# Whatsapp has no date embedded so it gets it from filename
Trying from filename
Trying from filename - maybe without dashes
mkdir -p whatsapp/20221021/
mv IMG-20221021-WA0000.jpg whatsapp/20221021/
# Nikon without GPS
mkdir -p NIKON/20220613/
mv DSC_1423.MOV NIKON/20220613/
# Whatsapp video without exif
mkdir -p whatsapp/20170528/
mv VID-20170528-WA0006.mp4 whatsapp/20170528/
# No camera name detected in exif from mobile movie
mkdir -p 20190114/Maarssen
mv VID_20190114_142455.mp4 20190114/Maarssen
# Location in mp4
mkdir -p 20220607/Lamlash(GB)
mv VID20220607155044.mp4 20220607/Lamlash(GB)
I’m using a windows program for typesetting bagpipe music. Luckily this runs on Linux using wine.
Sometimes i just want a PDF version of a tune, for example for my tunebook compiler. (Other post) Or i want to batch convert a lot of bww files.
A long time ago i used a virtual machine with automation software for this. Why not automate the process on my Laptop?
So i made this script, with a workaround for the xdotool wine problem. (wine window needs to be active to accept key strokes, other linux xwindows you can use the ID of the window)
#!/bin/bash
# use c for close at the end, without c bgplayer wont be shut down
# bww2pdf path/to/music.bww c
# make tmp file
cat "$1" > /tmp/deze.bww
# start bgplayer if not started .. if not started wait 3 secs
slp=0
pgrep BGPlayer.exe >/dev/null || slp=3
pgrep BGPlayer.exe >/dev/null|| ( nohup wine ~/.wine/dosdevices/c\:/Program\ Files\ \(x86\)/Bagpipe\ Player/BGPlayer.exe & )
sleep $slp
# get program id
pid=$(pgrep BGPlayer.exe)
# get xwindow id using pid
winid=$(xdotool search --limit 1 --all --pid $pid)
# activate window
xdotool search --desktop 0 --class "BGPlayer.exe" windowactivate
# open file menu and Open file
xdotool key --window $winid "alt+f"
xdotool key --window $winid "o"
# give program time to execute
sleep 1
# open our tmp file
xdotool type '\tmp\deze.bww'
xdotool key KP_Enter
sleep 2
# open file menu select Print and PDF as output
xdotool key "alt+f"
xdotool key "p"
xdotool key "P"
sleep 2
# execute
xdotool key KP_Enter
sleep 1
# File close
xdotool key "alt+f"
xdotool key "c"
sleep 2
# close program when c was added to commandline
mv ~/PDF/deze* "$1.pdf"
if [ "$2" == "c" ] ; then
xdotool key "alt+f"
xdotool key "x"
fi
I’m not touching the keyboard when the program is running, all handled by the script
Last year i made a script for a friend who wanted to detect visually if his garden sprinkler was on or off. A few days ago i saw someone who wanted to see if things where moving in his house. (didn’t trust his landlord i think) But he only had a dumb/simple/cheap camera .. so it had no motion detection.
I was thinking of my script, and could easily adapt it for this usage.
Most ipcams have somekind of URL/API you can use to capture a image. Some examples below
So using below script i can capture a image, compare it to the previous, and when it’s above a certain threshold sends a email.
#!/bin/bash
# Only uses wget and image-magick
treshhold=500
fuzzyness=20%
# CHANGE WEBCAM THINGY TO OWN URL AND CREDENTIALS
wget -q "http://webcamip/cgi-bin/api.cgi?cmd=Snap&channel=0&user=user&password=password" -O previous.jpg
while true; do
wget -q "http://webcamip/cgi-bin/api.cgi?cmd=Snap&channel=0&user=user&password=password" -O current.jpg
value=$(compare -fuzz $fuzzyness previous.jpg current.jpg -metric mae diff.jpg 2>&1 | cut -f1 -d.)
if [ $value -gt $treshhold ] ; then
echo "ping $treshhold"
echo "Something moved" | mail -s "Movement" user@example.com -A diff.jpg
fi
# Comment below if you want to compare against a base line .. not previous image
cat current.jpg > previous.jpg
sleep 60
done
Example previous picture
Example current picture
I got mailed with result
Hints tips:
Use crop to detect only a part.
copy current.jpg to a second file
Use painting black a part and compair with different treshhold fuzzyness to get different hotspots.
Below detects RED, use above ide with crop to detect red/green/blue leds
compare -verbose -metric mae 1.jpg 2.jpg /tmp/1.diff
1.jpg JPEG 2560x1920 2560x1920+0+0 8-bit sRGB 248819B 0.050u 0:00.057
2.jpg JPEG 2560x1920 2560x1920+0+0 8-bit sRGB 248949B 0.030u 0:00.137
Image: 1.jpg
Channel distortion: MAE
Channel distortion: MAE
red: 12517.5 (0.191005)
green: 11967.1 (0.182607)
blue: 12492.8 (0.190628)
all: 12325.8 (0.18808)
1.jpg=>/tmp/1.diff JPEG 2560x1920 2560x1920+0+0 8-bit sRGB 1.19495MiB 1.470u 0:00.197
Having a lot of devices and running a Lab wil use a lot of energy. Now with the energy crisis in Europe, i had to take a closer look at whats using power in my house.
I notished some weird usage patterns while measuring.
I’m using a few shelly power plugs, to measure devices and powerstrips.
With these devices you can control devices connected to it. On/Off/Timer etcetera. It wil measure the power usage in watts, and it even got a temperature sensor. I like the fact that it perfectly integrates into your home automation using an extensive API. curl commands to controll, and even MQTT messaging. Intergrating in Home Assistant is a breeze.
So i was monitoring a bunch of stuff using Nodered/Grafana/Homeassistant and saw some recurring usage. But being always late to check things, i made use of my ledserver i’ve build a long time ago.
This ledserver consists of a Raspberry Pi Zero, with a led string and a API written in python.
Below is autostarted on the Raspberry
( I made this ledserver for work, it showed the status of servers and services. Beside that every colleage had a range which he could use for his own scripts. I made some little bash script templates to have led funtions standard in your bash profile.
#!/usr/bin/python
# apt-get install python-flask
#
import Adafruit_WS2801
import Adafruit_GPIO.SPI as SPI
import struct
from flask import Flask, render_template, request
app = Flask(__name__)
PIXEL_COUNT = 32
SPI_PORT = 0
SPI_DEVICE = 0
pixels = Adafruit_WS2801.WS2801Pixels(PIXEL_COUNT, spi=SPI.SpiDev(SPI_PORT, SPI_DEVICE))
pixels.clear()
pixels.show()
@app.route("/led/<deviceName>/<color>")
def action(deviceName, color):
if deviceName == 'reset':
print ("reset")
pixels.clear()
print (deviceName)
led = int(deviceName)
s = color
r = int(s[ :2], 16)
b = int(s[2:4], 16)
g = int(s[4: ], 16)
pixels.set_pixel_rgb(led, r,g,b)
pixels.show()
templateData = {
'rled' : r,
'bled' : b,
'gled' : g,
'deviceName' : deviceName,
}
return render_template('index.html', **templateData)
@app.route("/control/<controlcommand>")
def actioncommand(controlcommand):
if controlcommand == 'clear':
print("clear")
pixels.clear()
pixels.show()
templateData = {
'controlcommand' : controlcommand,
}
return render_template('index.html', **templateData)
@app.route("/range/<start>/<stop>/<color>")
def rangecommand(start,stop,color):
s = color
r = int(s[ :2], 16)
b = int(s[2:4], 16)
g = int(s[4: ], 16)
startled = int(start)
stopled = int(stop)
while (startled < stopled):
pixels.set_pixel_rgb(startled, r,g,b)
startled=startled + 1
pixels.show()
templateData = {
'rangecommand' : rangecommand,
}
return render_template('index.html', **templateData)
if __name__ == "__main__":
app.run(host='0.0.0.0', port=8080, debug=True)
Now you can control the leds with a simple curl command:
So today i made a little script to show power usage.
I’m reading the current power usage from a LS120 Youless
Youless LS120 device, which you can connect to your P1 connector.
With below bash script i’m reading the webinterface and update the ledstring. I was using this ledserver for general notification usage. Below a 2 minute hack ..
How about a quess the picture from our photo collection?? (123580 photos .. ) So i show a random picture, and when i press ESC it will show some information about the picture … Quess the year and the event
Well i gave myself 15 minutes to program something ..
I was watching a tv show meanwhile .. but i managed to come up with this …
This script is showing a picture, when you press ESC it wil show some details.After that it will select another random picture.
Improvements : reading tags and other metadata from my photo database, to give more information.
It’s a little device you can place on your watermeter.
You get a plastic clip/holder which you can use to place the device on your watermeter. You can easily remove the device to read the values.
The device measures the little round gauge, so it has no idea what the current values are. Add the current values of your meter to the output of the device.
The device works by measuring the rotation of the red part.
By default it sends the information over the internet to a server. Your phone connects to this server and the app wil give you the graphs.
If you want your own intergration, you have to enable “local api” See image on the right. When you want realtime data, you have to connect a usb-c power supply. When using batteries, the device wil only connect to wifi once per 5 minutes, and you can’t use the API.
I wrote a little test script in bash to draw graphs using mqtt and Nodered.
Sorting my fileserver i found a lot of Bash/Linux scripts maybe useful.
Some are tool usage only, maybe I’ll remove this page. But this being my own log/notebook, who knows
Port knocker .. opens port 22 when you send a tcp packet to port 1600 first. Note: when portscanning it wil close again when accessing 1601 or 1599. Note2: NOT active on my server .. duh!
(Open with a browser or telnet/netcat)
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -m recent --rcheck --name SSH -j ACCEPT
iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 1599 -m recent --name SSH --remove -j DROP
iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 1600 -m recent --name SSH --set -j DROP
iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 1601 -m recent --name SSH --remove -j DROP
iptables -A INPUT -m tcp -p tcp --dport 22 -j DROP
Dump and share your log, you get a short link to share
Start in screen
Start screen in "detached" mode. This creates a new session but doesn't attach to it. This is useful for system startup scripts.
/usr/bin/screen -d -m -S backup /usr/local/bin/backup.sh
screen -r backup
Screensize
ctrl-a :fix # Screensize fix
Memory leak check
pmap <pid> | tail -1
Memory leak .. pmap opslaan en vergelijken met een pmap later.
Listen to remote microphone local playback
ssh -C monitor@remoteserver arecord -f dat | aplay -f dat
Root login to named account
ssh-copy-id root@remote-server (one time only)
then:
ssh root@remoteserver
Lookup named account
cat /var/log/secure | grep publickey | cut -f6 -d: | while read ; do ssh-keygen -lf ~/.ssh/authorized_keys | grep $REPLY ;done
2048 SHA256:l85g/NvPnEy85UVfJ5LJw3NvPnEy85UVfJ5LJw3NvPnEy85UVfJ5LJw3 haanstoot@minka (RSA)
log into ovirt engine and postgres
psql -d engine -U postgres -c 'select vm_names,disk_profile_name,storage_id,disk_id,image_guid,disk_alias from public.all_disks;'
Gluster heal info
gluster volume info | egrep "Volume Name|Type" | grep -B1 Replicate | grep "Volume Name" | cut -c14- | while read ;do gluster volume heal $REPLY info > /tmp/$REPLY.out ; done
ls /tmp/*out | while read ;do cat $REPLY | grep entries | grep -v "Number of entries: 0" >/dev/null && echo $REPLY ;done | while read heal ; do cat $heal ;done | tac |sed -e '/Number of entries: 0/I,+1 d' | tac | uniq
Some work tips i’ve posted
VI
Vim comments
toevoegen
ga op de eerste regel van de te commenten regel staan
ctrl-v (visual)
naar beneden tot eind regel (met cursor of pagedown)
ctrl-i
#
esc (kan even duren)
verwijderen
ga op de eerste regel van de te uncommenten regel staan
ctrl-v (visual)
naar beneden tot eind regel (met cursor of pagedown)
x
esc
Als user config geedit en geen schrijfrechten?
:!bash
chmod 666 bestand
:wq
chmod bestand naar wat hij was
Input / verwerk door bash vanuit vi
:0,5 !sort # eerste 5 regels door sort heen halen
:r !date # datum in je tekst document
Vim tabs / multiple files
vi /etc/hosts /etc/services
:n
:prev
VIM7 tabs
vim -p /etc/hosts /etc/profile
:tabe /etc/services
:tabn
:tabp
Key mappen
:map <F7> :tabp <CR>
:map <F8> :tabn <CR>
zet deze in je $HOME/.vimrc ... zonder de eerste ":"
Vi redirect
:r date # datum in text
:1,5!sort -n # sorteren van eerste 5 regels met een extern commando (kan ook met shift v een visual gedeelte selecteren)
:0,$!cut -f1 -d: # alleen field 1 van text overhouden (delimiter :)
Vi inspringen bij loop code
selecteer met shift-v de regels die moeten inspringen.
daarna > of < gebruiken om te tabben
Speciale charakters met vi bekijken
:set list
een tab zier er dan uit als ^I
Bash
sudo vergeten in commando
service apache restart
sudo !!
Bash truck vorige commando
doet vorig commando met aangepast keyword
systemctl status ovirt-ha-broker.service
^status^start
{} expand
directory's archief30_tmp t/m archief35_tmp recursive directories chmod 2775 zetten
find achief{30..35}_tmp -type d -exec chmod 2775 {} \;
of
mkdir tmp{1..3}
echo pr{ut,utser}s
1 regel uit een script starten zonder copy-paste (bijvoorbeeld in een remote-console sessie)
grep ipa command uit cobber.ks en voor deze uit
( /usr/sbin/ipa-client-install --domain=mgtdomain --enable-dns-updates -w password --realm=domain --server=server.domain --hostname=hypervisor.domain --unattended --force-ntpd )
cat cobbler.ks | grep ipa | bash
Bash karakters omdraaien
Linkerhand rechterhand coordinatie probleem smile
upadte
ga op de d staan en druk ctrl-t
Bash laatste woord vorige regel
ls -latrd /var/data/extra/backup
chmod 775 <ESC(punt)>
Ssh forward bij een running sessie
[haanstoot@xxx202 ~]$
~C (tilde C)
-L8080:localhost:80 (redirect localhost port 80 naar eigen machine poort 8080
-D9999 (Dynamic socks forward, zie andere post in deze wiki)
CTRL-C werkt niet?
ctrl\
SSH .ssh/config
KeepAlive yes <---------- dont die on me
ServerAliveInterval 60 <---------- dont die on me
Host *.domain <-- voor alle hosts in radlan fast login en geen vraag over key
StrictHostKeyChecking no
UserKnownHostsFile=/dev/null
host *.domain <-- domain is altijd mijn user
user haanstoot
GSSAPIAuthentication no <-- speedup
host pruts*.domain
user pi
Parallel tasks
4 parallel jobs
find jpg -type f -name \*.jpg -print0 | xargs -0 -n1 -P4 ./convert.sh
clusterssh truck
clusterssh alle svgs <--- naar alle svgs
sudo su -
cd /bricks/*/store <--- cd naar deze als bestaat
cd /rhgs/brick0*/store <-- cd naar deze als bestaat (nu sta je in atelier directories als deze bestaat als root in de svgs)
pwd | grep store || logout <--- geen atelier dir waar je staat? dan logout
id | grep haanstoot && logout <-- net logout? dus eigen user ... dan logout
eindresultaat ... als root in atelier volumes op svgs waar ze bestaan
Start in screen
/usr/bin/screen -d -m -S backup /usr/local/bin/backup.sh
screen -r backup
Start screen in "detached" mode. This creates a new session but doesn't attach to it. This is useful for system startup scripts.
Sudo vergeten
systemctl restart httpd (wil niet als user)
sudo !!
(doet "sudo systemctl restart httpd")
Reuse arguments
Bijvoorbeeld:
# touch file1 file2 file3 file4
# chmod 777 !*
Voert uit: chmod 777 file1 file2 file3 file4
5 meeste disk gebruikers human readable
du -hsx * | sort -rh | head -5
rm groot bestand duurt lang
: > /mappen2/archieven/test.img
Check memory bankjes
sudo dmidecode| grep -i -B1 "Form Factor" (B1 betekend BEFORE 1 regel meenemen, A is AFTER)
Size: 8192 MB
Form Factor: DIMM
--
Size: 8192 MB
Form Factor: DIMM
--
Size: No Module Installed
Form Factor: DIMM
--
Set time and restart NTP service
sudo service ntpd stop && sudo ntpdate ntp1.domain && sudo ntpdate ntp2.domain && sudo service ntpd start
Aliases en terminal kleuren
In een terminal f*ckedup colors?
komt door de alias
alias ls='ls --color'
deze even uitzetten / niet gebruiken?
\ls
Werkt voor alle aliassen
Snelle delete
Niet onderstaande gebruiken voor grote dirs
rm -rf /path/bla
Maar
mkdir /tmp/leeg ; rsync -a --delete /tmp/leeg /path/bla
Bash best practices
BashBestPractices
Script log replay
script --timing=/tmp/time.txt /tmp/script.log
scriptreplay -t /tmp/time.txt /tmp/script.log
There are toooo many cool sniplets .. only adding when i’m bored.
"If something is worth doing, it's worth overdoing."
