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grepflags

Combining grep flags

I'm trying to find lines that start with 'query' or the following sign: '>' but I don't know how to do this.

If this is the dataset:

query=345
query=4565
brink=980
>ehlhdhdk
>blonk

I want to only preserve the lines 1,2,4 and 5. I have tried: grep -e 'query=' filename.txt||grep -F '>' filename.txt > newfile.txt

and: cat filename.txt | grep -e 'query='||grep -F '>' > newfile.txt. But these do not work and they do not output the newfile.txt and instead they just output into the terminal.

Solution

  • Use multiple patterns with option -e:

    grep -e '^>' -e '^query' file

    Output:

    query=345
query=4565
>ehlhdhdk
>blonk