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commands-general-tools [2019/10/31 17:05]
alex [File Stuff] create a 7-ZIP archive encrypted with a password
commands-general-tools [2020/07/11 11:22] (aktuell)
alex [Conversion Stuff] add rounded corners to an image (for app icon with rounded corners in the style of iPhone‘s SpringBoard)
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 clang++ -dM -E -x c /dev/null clang++ -dM -E -x c /dev/null
 </code> </code>
 +
 ==== OpenSSL ==== ==== OpenSSL ====
  
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 === verify DNSSEC chain of a domain === === verify DNSSEC chain of a domain ===
 <code bash> <code bash>
-## obtain the root keys first+## if you don't have the root keys yet, obtain them first 
 +unbound-anchor -a /usr/local/etc/unbound/root.key 
 +## if the root key file is at the standard path of your unbound/ldns installation, the "-k" option can be omitted
 drill -S -k /usr/local/etc/unbound/root.key kuehrmann.de drill -S -k /usr/local/etc/unbound/root.key kuehrmann.de
-## if your resolver does not support DNSSEC use e.g. Quad9 +## if your resolver does not support DNSSECuse a public one, e.g. Hurricane Electric 
-drill -S -k /usr/local/etc/unbound/root.key kuehrmann.de @9.9.9.9+drill -S -k /usr/local/etc/unbound/root.key kuehrmann.de @74.82.42.42
 </code> </code>
-[[https://www.freebsd.org/cgi/man.cgi?query=drill&sektion=1| drill(1)]]+[[https://www.freebsd.org/cgi/man.cgi?query=drill&sektion=1|drill(1)]] [[https://www.freebsd.org/cgi/man.cgi?query=unbound-anchor&sektion=8|unbound-anchor(8)]]
  
 === check whether your DNS resolver discards invalid DNSSEC domains === === check whether your DNS resolver discards invalid DNSSEC domains ===
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 </code> </code>
 [[https://www.freebsd.org/cgi/man.cgi?query=7z&sektion=1|7z(1)]] [[https://www.freebsd.org/cgi/man.cgi?query=7z&sektion=1|7z(1)]]
 +
 +=== view contents of ZIP or TAR files without complete extracting ===
 +<code bash>
 +### example of "Android Package Kit" which is actually a ZIP file
 +unzip -l SomeAndroidApp.apk
 +unzip -p SomeAndroidApp.apk META-INF/MANIFEST.MF
 +### example of an "Open Virtual Appliance" which is actually a TAR file
 +tar -tf SomeAppliance.ova
 +tar -xfO SomeAppliance.ova SomeAppliance.ovf
 +</code>
 +[[https://www.freebsd.org/cgi/man.cgi?query=unzip&sektion=1|unzip(1)]] [[https://www.freebsd.org/cgi/man.cgi?query=tar&sektion=1|tar(1)]]
 +
  
 ==== Disk and Partition Stuff ==== ==== Disk and Partition Stuff ====
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 ssh user@src.example.com "cat /backup/basil-sda.img.lz4" | lz4cat | pv | dd of=/dev/sda bs=1048576 ssh user@src.example.com "cat /backup/basil-sda.img.lz4" | lz4cat | pv | dd of=/dev/sda bs=1048576
 </code> </code>
 +
 ==== Conversion Stuff ==== ==== Conversion Stuff ====
  
-=== make a big image small with ImageMagick ===+=== convert image file using ImageMagick ===
 <code bash> <code bash>
 +## make a big image small
 convert big_input.tif -resize 256x256 small_output.png convert big_input.tif -resize 256x256 small_output.png
 +## make an image grayscale and remove any transparency
 +convert input.png -alpha deactivate -colorspace Gray output.png
 +## create PNG with transparency from SVG, determine it's pixel dimensions from a DPI parameter
 +convert -background none -density 1200 input.svg output.png
 +## create PNG with transparency from SVG, specify it's pixel dimensions directly
 +convert -background none -size 512x512 input.svg output.png
 </code> </code>
 [[https://www.freebsd.org/cgi/man.cgi?query=convert&sektion=1|convert(1)]] [[https://www.freebsd.org/cgi/man.cgi?query=ImageMagick&sektion=1|ImageMagick(1)]] [[https://www.freebsd.org/cgi/man.cgi?query=convert&sektion=1|convert(1)]] [[https://www.freebsd.org/cgi/man.cgi?query=ImageMagick&sektion=1|ImageMagick(1)]]
  
-=== make an image grayscale and remove any transparency with ImageMagick === +=== batch convert images in a directory: rename by creation date and resize to width === 
-<code> +<code bash
-convert input.png -alpha deactivate -colorspace Gray output.png+### for JPGs 
 +exiftool -ext jpg '-FileName<CreateDate' -d %Y%m%d_%H%M%S%%-c.%%e . 
 +mogrify -resize 375 -define preserve-timestamp=True *.JPG 
 +### for PNGs 
 +exiftool -ext png '-FileName<DateCreated' -d %Y%m%d_%H%M%S%%-c.%%e . 
 +mogrify -resize 375 -define preserve-timestamp=True *.PNG 
 +### Comments: 
 +## the "%%-c" in the filename template is for a numerical suffix, in case of multiple images with the same date 
 +## the "-define preserve-timestamp=True" is for keeping file attributes for timestamps 
 +## for case-sensitive filesystems in the "mogrify" command the glob pattern must be adjusted
 </code> </code>
-[[https://www.freebsd.org/cgi/man.cgi?query=convert&sektion=1|convert(1)]] [[https://www.freebsd.org/cgi/man.cgi?query=ImageMagick&sektion=1|ImageMagick(1)]]+[[https://www.freebsd.org/cgi/man.cgi?query=exiftool&sektion=1|exiftool(1)]] [[https://www.freebsd.org/cgi/man.cgi?query=mogrify&sektion=1|mogrify(1)]] [[https://www.freebsd.org/cgi/man.cgi?query=ImageMagick&sektion=1|ImageMagick(1)]] 
 + 
 +=== add rounded corners to an image (for app icon with rounded corners in the style of iPhone‘s SpringBoard) === 
 +<code bash> 
 +### Adjust the corner radius (in pixel) to your needs. 
 +### For a 1024x1024 image a value of 128 looks good. 
 +RADIUS=128 
 + 
 +### The whole ImageMagick command is quite complex. The resulting rounded image is written to a new file.  
 +### The cascade of parenthesized options defines the operations to cut out the transparent arcs in the corners. 
 +convert AppIconRaw.png \( +clone -alpha extract \ 
 +  \( -size ${RADIUS}x${RADIUS} xc:black -draw "fill white circle ${RADIUS},${RADIUS} ${RADIUS},0" -write mpr:arc +delete \) \ 
 +  \( mpr:arc \) -gravity northwest -composite \ 
 +  \( mpr:arc -flip \) -gravity southwest -composite \ 
 +  \( mpr:arc -flop \) -gravity northeast -composite \ 
 +  \( mpr:arc -rotate 180 \) -gravity southeast -composite \) \ 
 +  -alpha off -compose CopyOpacity -composite AppIconRounded.png 
 +</code> 
 +[[https://www.freebsd.org/cgi/man.cgi?query=convert&sektion=1|convert(1)]] [[https://www.freebsd.org/cgi/man.cgi?query=ImageMagick&sektion=1|ImageMagick(1)]] [[https://imagemagick.org/script/command-line-processing.php|ImageMagick - Command-line Processing]] [[http://www.imagemagick.org/script/command-line-options.php|ImageMagick - Command-line Options]]
  
 === Unix timestamp to human readable time === === Unix timestamp to human readable time ===
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 </code> </code>
 [[https://www.freebsd.org/cgi/man.cgi?query=recode&sektion=1|recode(1)]] [[https://www.freebsd.org/cgi/man.cgi?query=recode&sektion=1|recode(1)]]
 +
 ==== Process Stuff ==== ==== Process Stuff ====
  
commands-general-tools.1572537916.txt.gz · Zuletzt geändert: 2019/10/31 17:05 von alex