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判断

判断命令是否存在​

if not command -sq kubecolor
    echo "kubecolor not installed"
else
    echo "kubecolor installed"
end

判断字符串是否为空​

if test -z "$str"
    echo "str is empty"
else
    echo "str is not empty"
end

判断字符串是否不为空​

if test -n "$str"
    echo "str is not empty"
else
    echo "str is empty"
end

判断变量是否存在​

if set -q _flag_n
    echo "\$_flag_n is $_flag_n"
else
    echo "\$_flag_n is not set"
end