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Full Discussion: Tail -f Command help
Top Forums UNIX for Beginners Questions & Answers Tail -f Command help Post 303026559 by Corona688 on Thursday 29th of November 2018 12:29:59 PM
Old 11-29-2018
You can probably do this in your terminal by printing an escape sequence to change color (and another after, to reset it to normal). 1;31 means bold+red, 0 means reset. See this list for other colors.

Code:
$ tail -f file | awk '/ERROR/ { $0="\x1b[1;31m" $0 "\x1b[0m"; } 1'

text
text
text
something something ERROR something something
text
text
text

You may even be able to make your computer beep from your terminal, as there's a special nonprinting character \a just for that:
Code:
$ tail -f file | awk '/ERROR/ { $0="\a\x1b[1;31m" $0 "\x1b[0m"; } 1'

text
text
text
something something ERROR something something
text
text
text

These 2 Users Gave Thanks to Corona688 For This Post:
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LEARN ABOUT NETBSD

set_color

set_color(1)							       fish							      set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
       font color, while set_color --bold white will result in a white font color.

       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
       incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1							  Sun Jan 8 2012						      set_color(1)
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