LinuxQuestions.org - [SOLVED] Using cut in continuous follow (tail -F)

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Using cut in continuous follow (tail -F)

I want to follow a file, filter for the word FOOBAR and only display certain fields of it by delimiting with a space.
Is this possible?

This works ok, but I just want the 1st, 2nd and 5th field

Code:

sudo tail -F /var/log/syslog | grep --color FOOBAR

This just sits there with no output.

Code:

sudo tail -F /var/log/syslog | grep --color FOOBAR | cut -d' ' -f 1,2,5

Running this works as expected (example output would be Oct 2 127.0.0.1)

Code:

sudo tail /var/log/syslog | grep --color FOOBAR | cut -d' ' -f 1,2,5

Try using the "--line-buffered" option of grep: https://www.gnu.org/software/grep/ma...#Other-Options

That solved it. Thanks

Code:

      --line-buffered

              Use line buffering on output.  This can cause a performance penalty.

Code:

sudo tail -f /var/log/syslog | grep --line-buffered --color FOOBAR | cut -d' ' -f 1,2,3,7,11