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When using Bash, how do I search for a string in output?

To search for a string in output using grep in bash, you can use the following command:“`
command | grep “string”

Replace "command" with the command that produces the output you want to search, and "string" with the string you want to search for. 
For example, if you want to search for the word "error" in the output of a command that lists files in a directory, you can use the following command:

ls -l | grep

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