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my_var=10
x=123
echo $1
echo $USER
${HOME}
((a+b))
((a*b))
((a/b))
((a%b))
((a|b))
((a^b))
((a=b))
((a!b))
((a<b))
((a>b))
$((a<b))
$((a>b))
$((a&b))
$((a|b))
${a:b}
${a:b}
${a:b}
${a:b}
${a#*/}
${a%.*}
${a^}
${a,}
${a}
${a[*]}
ls -a
ls --all