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Your if constructs need to be rearranged, as if the first if conditions is true, the others in the then branch won't come true any more. Try



while read YEAR
do for i in...

This is another example of why you should always tell us what operating system and shell you're using when you post a question in this forum.

From what I have seen in other threads in this forum...

Have you considered reading "dynamic_years.txt" first, in a while-loop, and applying that to the inner for-loop?

e.g.

while read YEAR; do
for i in XYZ_*ABC$YEAR.csv; do
printf "%s\n"...

Go back to nawk or /usr/xpg4/bin/awk with:
/usr/xpg4/bin/awk -F, '$1 == "a" && $4 ~ /^"(2[3-5]|998|1003|14356)"$/ {$1 = "b"}1' file

This way, you look for a number with 5 digits.
Starting with 2, the second digit can be 3, 4 or 5
the third digit can be 1, 0 or 3 and so on
You must use the | (or) to catch what you need.
sed -E...

Using nawk:-
nawk -F, '$4>=23&&$4<=25{$1="b"}1' OFS=, file

Hi.

Unclear to me what is meant by dynamically. Here is a solution with grep:
#!/usr/bin/env bash

# @(#) s1 Demonstrate delete lines with reference file, grep.

# Utility functions:...

As long as empty lines between sets of data aren't important, you can also use:
sed -n '/^Test/,/Ended/p' file
and:
awk '/^Test/,/Ended/' file
both of which produce the output:
Test [Red]
...

Three examples:

perl -ne '/^Test|^Time/ and print' weknowd.file
Test [Red]
Time Started= [2.3] secs
Time Ended = [4.5] secc
Test[Yellow]
Time Started= [2.3] secs
Time Ended = [4.5] secc

...

awk -F, '{print FNR,$0}' OFS=, myFile

What shell are you using? What OS are you using?

Your pseudo-code raise lots of ambiguities. You have ifs and thens, but no elses or fis.

count it as digit is not a valid shell command and...

#!/bin/bash

COUNT=0

cp a/x.csv b/x.csv 2>/dev/null
(( $? != 0 )) && (( COUNT++ ))

cp a/d.csv b/f.csv 2>/dev/null
(( $? != 0 )) && (( COUNT++ ))

mv b/x.csv b/vin.csv 2>/dev/null
(( $?...

Sorry, use this

$ for i in al*.csv; do [ $(wc -l < "$i" ) -gt 1 ] && zip "${i%%.*}" "$i"; done

Assuming that you're using a shell that recognizes basic POSIX shell constructs, you could try something like:
for i in a_cd_*.csv
do if [ $(wc -l < "$i") -gt 1 ]
then printf "%s\n" "$i"
fi...