How to highlight certain words in the output of a bash script?

Question

linux

Tell me please.
I want to write a simple script to make it easier to parse the iptables trace.

#!/bin/bash
tail /var/log/syslog -n $1 | cut -d" " -f8-10,12-13,20-22,31

Here's what happens

filter:FORWARD:rule:6 IN=eth2 OUT=eth0 SRC=91.210.170.11 DST=10.200.2.2 PROTO=TCP SPT=40860 DPT=22 MARK=0x210014
filter:WWW_SERV_FILTER:rule:17 IN=eth2 OUT=eth0 SRC=91.210.170.11 DST=10.200.2.2 PROTO=TCP SPT=40860 DPT=22 MARK=0x210014
filter:FORWARD_ACCEPT:rule:1 IN=eth2 OUT=eth0 SRC=91.210.170.11 DST=10.200.2.2 PROTO=TCP SPT=40860 DPT=22 MARK=0x210014
raw:PREROUTING:policy:3 IN=eth2 OUT= SRC=91.210.170.11 DST=178.217.153.77 PROTO=TCP SPT=40860 DPT=10022
mangle:PREROUTING:rule:6 IN=eth2 OUT= SRC=91.210.170.11 DST=178.217.153.77 PROTO=TCP SPT=40860 DPT=10022
mangle:WWW_SERV:rule:1 IN=eth2 OUT= SRC=91.210.170.11 DST=178.217.153.77 PROTO=TCP SPT=40860 DPT=10022
mangle:WWW_SERV:rule:3 IN=eth2 OUT= SRC=91.210.170.11 DST=178.217.153.77 PROTO=TCP SPT=40860 DPT=10022
mangle:WWW_SERV:return:5 IN=eth2 OUT= SRC=91.210.170.11 DST=178.217.153.77 PROTO=TCP SPT=40860 DPT=10022

It outputs in this form, but so that it is not just a black and white sheet, I want to highlight the keywords in different colors. (table names raw, mangle, nat, filter and fields IN, OUT, SRC, DST, etc.)
Tell me how this can be done?

Answer 1

#!/bin/bash
tail /var/log/syslog -n $1 | cut -d" " -f8-10,12-13,20-22,31 | \
sed '
s/filter/\o33[32m&\o033[0m/g;
s/mangle/\o33[33m&\o033[0m/g;
s/raw/\o33[31m&\o033[0m/g;
s/nat/\o33[35m&\o033[0m/g;
s/OUT/\o033[1m&\o033[0m/g;.
s/IN/\o33[1m&\o033[0m/g;.
s/PROTO/\o33[1m&\o033[0m/g;.
s/MARK/\o33[1m&\o033[0m/g;.
s/DPT/\o33[1m&\o033[0m/g;.
s/SPT/\o33[1m&\o033[0m/'

Yes, it worked, thanks

Answer 2

google "color in bash" kua descriptions.
https://habr.com/ru/post/119436/

Answer 3

echo -e '\e[31;1mПривет!\e[0m'
See man console_codes for details.