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And I see it works fine on multiple lines to :)echo "toy
home" | rev
yot
emoh

If it cant be done with awk, its not worth doing it ;)

This works.
ps | awk "{print $var}"

Single quote does not expand variable.

Since I do not like to use bc because its not in all image. And normal I use bash. To do use math I use awk. This should work in most image.
Sed is not tool for math, so I do not see any reason...

Some more awk
awk -F"sip:|@" '{print $2}' file

gnu awk
awk '{print gensub(/.*sip:(.*)@.*/,"\\1","g")}' file

Its not a good habit to use _ as an variable. New user would have problem understanding what is going on.
Change it to some like
awk -F, '{arr[$3]=arr[$3]?arr[$3] OFS $2:$1 FS $2} END {for(i in...

Your problem with this: awk '/unburnt:.*burnt:/{Tu=$6;Tb=$NF}END{print Tu, Tb}' star.log is that you do the print in the END section. This will just print one instance.
Change it to:
awk...

awk -F"[ =]" ' #setting the field separator to space or equal
/WORD1/ { #search for lines containing "WORD1"
print $3 #print filed number 3
}' file

This was very interesting, and an eye opener. I have never tested this, just thought i many be solver to run ting in loop. This prove it many be wrong.
Thanks for taking time to test. :)

Why not use awk???
awk is a good tool for this job. Here is another version.
echo a,b,c,d,e,f,g,h,i | awk 'NR>5 && $1~/f/ {print "yes"}' RS=,
yes
This prints yes if an f is found after 5th ,

I try to avoid loops in awk to speed things up. If you have gnu awk, you can do this:
awk '{a+=$1} END {print a}' RS=" |\n" file?
1779
If you like to store this into a variable do this:...

Using awk and getting text at correct position (tabbed)
awk -F"\t" '/parent::__construct()/ {$0=$0"\n";for (i=1;i<NF;i++)t=t "\t";$0=$0 t "NEW STRING"}1' application/core/MY_Controller.php
<?php ...

awk -F"[ =]" '/WORD1/ {print $3}' file
value1-idkey1

EDIT:
Did not fix the space.
Here is another version that should work.
awk -F/ '{print $NF"§"$0}' file | sort | awk -F§ '{print $2}'
Path=/home/pikamon/Desktop/ABC;...

Using awk
awk 'NR%2==0' RS=\' file
/project/cars/version/scripts/
/project/cars/version/scripts/y.txt
/project/cars/version/scripts/x.txt

To get many of the awk version to work with code like this [0-9]{3}, you need to add --posix.
Eks
awk --posix '/^[0-9-]{3}/' file

This should make the original code to work.

And if your terminal support 256 colors, try this script:
#!/bin/bash
#
# generates an 8 bit color table (256 colors) for reference,
# using the ANSI CSI+SGR \e[48;5;${val}m for background and
#...

@disedorgue
Sed solution does not work with this line:
aa,"bb,rr,ff","cc,aa",dd,ee gives aa,"bb,rr,ff","LQcc,aa",dd,ee
correct aa,"bb,rr,ff","cc,aa",LQdd,ee



Fixed my solution to handle...

What is wrong with this post:
https://www.unix.com/shell-programming-scripting/234857-shell-script-extract-data-csv-file.html

With 40 post here, you should now how to use Code Tags

awk 'NR>=3 && NR<=5 {$0="OK "$0} 1'
surya
rama
OK ranga
OK laxman
OK rajesh
reddy

Use google
Or read section 43 here: Famous Awk One-Liners Explained, Part II: Text Conversion and Substitution - good coders code, great reuse...

awk -F"[][]" '{print $2}' /var/log/maillog
55.66.77.88

using awk
awk '{match($0,"[0-9][0-9][0-9][0-9][0-9][0-9]",a);print a[0]}' test1.txt
370956

PS do not cat the file to sed/awk, add file behind, like my example.

You did remove this OFS=","

Using or in regex
$9~/regex1|regex2|regex3|.../

This should work. No need print, since print $0 is default action.
awk -F\| '$9 ~ /\/.*[0-9]+/' file1 > file2

The * here \/* makes / optional. 0 or more hits. Remove this.
Same here:...