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58
content/blog/bashpartialargparse.md
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58
content/blog/bashpartialargparse.md
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---
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title: "Partial Argument Parse and Passing in Bash"
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date: 2020-09-07T21:33:26-04:00
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draft: false
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tags: []
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---
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Let's say we want to augment an existing terminal command (like for example `wget`). We then want to be able to add or edit command line options. The rest of this post provides an example that hopefully you can use in your bash script.
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```bash
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#!/bin/bash
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# Custom help function
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show_help() {
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echo "Usage: custom_command [arguments]"
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echo " --name <name>"
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echo " --flag_example"
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echo " <additional arguments to be passed along>"
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exit 0
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}
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# Defaults for our custom flags or parameters.
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name=""
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flag_example=0
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# Loop through and take out our custom parameters
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# from the parameter list.
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i=0
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numargs=$#
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while test $i -lt "$numargs"
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do
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case "$1" in
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"--help")
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show_help
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;;
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"--name")
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shift
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name=$1
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;;
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"--flag_example")
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flag_example=1
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;;
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*)
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set -- "$@" "$1"
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;;
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esac
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shift
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i=$((i+1))
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done
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# Do something here using our custom parameters
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# Pass our non-custom parameters to the application
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wget "$@"
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```
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37
content/blog/splittingfiles.md
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content/blog/splittingfiles.md
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---
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title: "Splitting Files to Circumvent Size Limits"
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date: 2020-09-07T20:41:25-04:00
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draft: false
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tags: []
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---
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Let's say you want to transfer file(s) over to someone and there is a limit the size you can transfer over. Maybe because of the physical medium or the online service you're using. You can make use of the terminal tool `split` in order to get the chunks over there and then use `cat ` to combine it back to one file.
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## Create a Single File
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Skip to the next section if you only want to transfer a single file.
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Otherwise, let's say you have a folder of files named `Documents`. First, let's create a gzipped compressed archive that contains everything.
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```bash
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tar -czf documents.tar.gz Documents
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```
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## Splitting the File
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Next let's split the file into 1 GB parts.
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```bash
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split -b 1GB -d documents.tar.gz PART
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```
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Then transfer the files labeled PARTX where X is the part number over....
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## Re-combining
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Once the files are transfered, we use `cat` to bring the files back together.
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```bash
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cat PART* > documents.tar.gz
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```
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22
content/blog/xvfb.md
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content/blog/xvfb.md
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---
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title: "Xvfb"
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date: 2020-09-07T20:49:54-04:00
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draft: false
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tags: []
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---
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X Virtual Framebuffer (Xvfb) is a great quick application to run applications that expect a `X11` server, but you don't care to see the visual output.
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To install:
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```bash
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sudo apt install xvfb
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```
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To run:
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```bash
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xvfb-run application
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```
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For more customization, I hear that it's better to use [xpra with Xdummy](https://xpra.org/trac/wiki/Xdummy). I haven't tried this myself yet, but if you experience issues with the application expecting `randr` or `glx` extensions, give it a shot.
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