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Don't use single quotes (which prevent expansion by the shell), but double quotes:
grep -E "^$variable" file.csv

$ awk -F, 'BEGIN{print "COL1,COL2"} NR>1 && $9 {print $1,$6}' OFS=, input.csv
COL1,COL2
1111,X100
3333,X300
4444,X400

Hello Ads89,

Could you please try following.

awk 'FNR==NR{A[$1]=$NF;next} FNR!=NR && FNR>1{Q=$1;$0=(Q in A)?$0 FS A[$1]:$0 FS;print;next} {print}' FS="|" Input_file2 Input_file1
Output...

If the data in COL2 is the same number of characters in every record and the data in COL3 is the same number of characters in every record, just concatenating those three fields in the awk variable...

I'm not sure that I fully understand what you're trying to do, but this seems to produce the output you want for each of the sample inputs you have shown us:
awk '
NR == 1 {
print
FS = OFS =...

The 4 is the element count from the conversion; see above:Can't you see the error in ?

---------- Post updated at 16:54 ---------- Previous update was at 16:52 ----------

Enclose split and...

How about I /tmp/bash-fc-763387004 Row 1 Col 1 3:16 Ctrl-K H for help
awk '...

Hello Ads89,

Welcome to forums, thank you for using code tags around some of codes you have shown in your post, request you to please use code tags for all commands/codes/Inputs shown in your...