Introduction to Bash Scripting

examples.sh

#!/usr/bin/env bash

##!/bin/bash

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# Variables

#var1="hello"
#echo $var1
#var2="hello"
#echo $var2

#my_dir=pwd
#echo $my_dir
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# Command Substitution

#my_dir=$(pwd)
#echo $my_dir

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# Arrays

#arr=(hello world)
#arr="hello world"
#echo ${arr[0]}
#echo ${arr[1]}
#echo ${#arr[*]}

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# Quoting
#echo "$(pwd)"
#echo '$(pwd)'

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# Math

#result=$((4 + 6))
#echo $result
#echo "$result"

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# Tests Statements

#echo $([ -z "hi" ])
#echo $([ -z "" ])
#echo $([ ! -z "" ])
#[ -z "" ] && echo "hi"
#[ -z "hi" ] ; echo "hi"

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# If Statements

#if [ -z "hi" ]; then echo "hi"
#fi
#if [ -z "" ]; then echo "hi"
#fi
#if [ -z "" ] && [ 0=0 ]; then echo "hi"
#fi
#if [ -z "hi" ] || [ 0=0 ]; then echo "hi"
#fi

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# Case Statements

#filetype=".md"
#filetype=".tex"
#filetype=".rmd"
#filetype=".Rmd"
#filetype=".c"
#case "$filetype" in
#    *.md) echo "You chose markdown" ;;
#    *.tex) echo "you chose a TeX file!" | sed 's/!/, and LaTeX is best/g' ;;
#    *.[rR]md) echo "you chose R Markdown" ;;
#    *) echo "you chose nothing, this is the default" ;;
#esac

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# loops

# While Loops
#counter=1
#
#while [ $counter -le 10 ]
#do
#    echo $counter
#    ((counter++))
#done
#
#echo All done

# Until loops
#counter=1
#
#until [ $counter -gt 10 ]
#do
#    echo $counter
#    ((counter++))
#done
#
#echo All done

# For loops

#names='Stan Kyle Cartman'
#
#for name in $names #why is this unquoted
#do
#    echo $name
#done
#
#echo All done

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# Brace Expansion & ranges

#for value in {1..5}
#do
#    echo $value
#done
#
#echo All done
#touch {file1,file2,file3}.md
#touch test_file{1..5}

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# Globbing through wild cards

#rm test_file*

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# regex

#grep "^\- \[x\]*" ~/notes.md
#My regex video

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# Functions

#function myFunc() {
#    echo -e "this is bad practice"
#}
#myFunc() {
#    echo "this is good practice"
#}
#
#myFunc

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# Shell Check

# Github scripts with shell check and travis