Its very similar to the questions second example but the command to use is grep -F ep -F here can be replaced with fgrep for short. I am using GNU bash, version 4.4.7(1)-release on 17.04. Heres a solution that works without installing extra programs such as multitail. Output of byobu -version is: byobu version 5.116 txt grep foo slightly modified to show the filename When it's not piped, the filename is conveniently part of the output. In fact the more general problem is if I encapsulate the command in quotes (whether single ' or double "), I get the same error. I get, sh: 1: tail -n 15 /var/log/syslog | grep -v -E "pattern1|pattern2": not found Here begins the problem: If I include the following line in my window.tmux new-window -n log watch -n 1 'tail -n 15 /var/log/syslog | grep -v -E "pattern1|pattern2"' The combination of watch, tail and grep can be achieved as per my need (thanks to steeldriver for his answer here.) watch -n 1 'tail -n 15 /var/log/syslog | grep -v -E "pattern1|pattern2"' So I would like to grep -v on these lines. ![]() However the problem (which is completely irrelevant to this thread) that there are lots of entries in my syslog (almost 4/5 lines per second), which I would like to avoid while monitoring. New-window -n log watch -n 1 tail -n 15 /var/log/syslog To find lines from a tail of /var/log/syslog that have 'cron' in them, just run: tail -f /var/log/syslog grep cron And since it accepts anything over stdin, you can use it on the output of any other command as well, by piping in the same way as above (using the symbol). So far I am able to achieve by doing the following: new-session -AD -s 'root' sudo su. ![]() In the upper portion I want to monitor my /var/log/syslog and in the lower one dmesg. I would like the second one to be split horizontally. (On start, it waits for the sudo passwd). I would like to have a tab (or window?) with a root prompt. I am (re)writing my windows.tmux for my frequently used byobu sessions. grep searches the named input FILEs (or standard input if no files are named, or if a single hyphen-minus (-) is given as file name) for lines containing a.
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