我试图将环境变量定义的价值(如果有的话)从纸面上取而代之。 我知道,我可以使用<条码>,以做到这一点,但我并不肯定如何取代环境变量的价值?
这里我想做的是:
鉴于该行的档案(见grep):
export MY_ENV=SOME_VALUE
我愿用其他东西取代SOME_VALUE。 我如何用<条码>填写<>。
This searches for the line beginning with export MY_ENV= and substitutes the rest of the line with NEW_VALUE:
sed s/^(export MY_ENV=).*$/1NEW_VALUE/
sed -e "s/SOME_VALUE/$MY_ENV/"
This locates the string SOME_VALUE and substitutes the value of $MY_ENV. The double quotes are crucial; don t use single quotes unless you want $, M, Y, ... in the replacement text.
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