将控制台输出捕获到变量中？

Question

运行实用程序时如何将控制台输出捕获到变量中，以便过滤文本？

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示例：我试图在键入时捕获控制台输出，bitcoind 以便可以过滤掉rpcpassword并将其写入配置文件。

ubuntu@ip-172-31-3-49:~$ bitcoind
Error: To use bitcoind, you must set a rpcpassword in the configuration file:
/home/ubuntu/.bitcoin/bitcoin.conf
It is recommended you use the following random password:
rpcuser=bitcoinrpc
rpcpassword=Eb5WDgzKqt77U4LhvvfnYxaNvw2rpztSvM5XKsonXBWC
(you do not need to remember this password)
The username and password MUST NOT be the same.
If the file does not exist, create it with owner-readable-only file permissions.
It is also recommended to set alertnotify so you are notified of problems;
for example: alertnotify=echo %s | mail -s "Bitcoin Alert" admin@foo.com

Answer 1

将输出重定向到一个文件，例如

bitcoind >~/bitcoind_output.txt 2>&1

这会将输出放在您的主目录中名为 bitcoind_output.txt 的文件中