相关疑难解决方法(0)

我在bash(3.00)shell脚本中对变量进行了大量测试,如果未设置变量,则会分配一个默认值,例如:

if [ -z "${VARIABLE}" ]; then 
    FOO='default'
else 
    FOO=${VARIABLE}
fi

我似乎记得在一行中有一些语法,类似于三元运算符,例如:

FOO=${ ${VARIABLE} : 'default' }

(虽然我知道这不起作用......)

我疯了,还是有类似的东西存在？

我一直在努力PERCY_TOKEN根据percy的官方指南在本地测试运行中设置它，并通过yarn.

指南说：

$ PERCY_TOKEN=aaabbbcccdddeeefff PERCY_BRANCH=local npm test

我现在的尝试是这样的：

包.json

$ PERCY_TOKEN=aaabbbcccdddeeefff PERCY_BRANCH=local npm test

...
"scripts": {
    "start": "react-scripts -r @cypress/instrument-cra start",
    "start:silent": "BROWSER=none yarn start",
    "start:server": "start-server-and-test start:silent http://localhost:3000",
    "build": "react-scripts build",
    "eject": "react-scripts eject",
    "envGenerateExample": "cat .env | sed 's/=.*/=/g' > .env.example",
    "jest:test": "react-scripts test --env=jest-environment-jsdom-sixteen",
    "cy:run": " 'yarn start:server './node_modules/.bin/cypress run'",
    "cy:open": "yarn start:server './node_modules/.bin/cypress open'",
    "cy:ci": "yarn start:server cy:chrome",
    "cy:chrome": "cypress run --browser chrome --record",
    "percy:exec": "yarn percy …