How to grep text from a specific line?

Question

I need to grep text from a specific line.

I don't need to grep from the whole file, but only one line.

CATS_COLOR_TEST=$(grep FF0000 "${STYLE_FILENAME}")

how to specify a line, for example, I need 31.

Answer 1

您可以像这样使用单个awk ：

CATS_COLOR_TEST=$(awk 'NR == 31 && /FF0000/' "$STYLE_FILENAME")

Answer 2

您可以像这样使用 head 和 tail：

head -n 31 file_to_grep | tail -n 1