If

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wikipedia:Conditional (computer programming)

• Bash: https://stackoverflow.com/questions/18668556/comparing-numbers-in-bash

if (( a > b )); then
    ...
fi

if (( a > b )); then
    ...
else
    ...
fi

Activities

• Read http://www.rosettacode.org/wiki/Conditional_structures#UNIX_Shell

See also

• Programming: C, Python, go, loop, while, for, if, variable, Error handling, Regex, Function, IDE, await, R (programming language), XACML, Type, Class inheritance, Methods, Scheme, Array, Deserialization