Linux tee命令

Usage: tee [OPTION]... [FILE]...
Copy standard input to each FILE, and also to standard output.

-a, --append              append to the given FILEs, do not overwrite
-i, --ignore-interrupts   ignore interrupt signals
--help     display this help and exit
--version  output version information and exit

If a FILE is -, copy again to standard output.

ls "*" 2>&1 | tee ls.txt

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