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Just place an echo before your sed command to see where n why you are going wrong.

One way to go, using the sed editor is:

# assuming default IFS
## based on Kusalananda's observations
set -f ;# disable globbing
list="2 5 7 10"
for i in $list;do
  echo "${i}p"
done | sed -nf - longText.txt

## or per K.
# printf '%sp\n' $list | sed -nf - longText.txt

Just place an echo before your sed command to see where n why you are going wrong.

One way to go, using the sed editor is:

# assuming default IFS
## based on Kusalananda's observations
set -f ;# disable globbing
list="2 5 7 10"
for i in $list;do
  echo "${i}p"
done | sed -nf - longText.txt

## or per Kusalanda method has a bug in it
## for empty list it generates wrong output
# printf '%sp\n' $list | sed -nf - lonxt.txt

Just place an echo before your sed command to see where n why you are going wrong.

One way to go, assuming GNU sed, is:

# assuming default IFS
## based on Kusalananda's observations
set -f ;# disable globbing
list="2 5 7 10"
for i in $list;do
  echo "${i}p"
done | sed -nf - longText.txt

## or per K.
# printf '%sp\n' $list | sed -nf - longText.txt

Just place an echo before your sed command to see where n why you are going wrong.

One way to go, using the sed editor is:

# assuming default IFS
## based on Kusalananda's observations
set -f ;# disable globbing
list="2 5 7 10"
for i in $list;do
  echo "${i}p"
done | sed -nf - longText.txt

## or per K.
# printf '%sp\n' $list | sed -nf - longText.txt

Just place an echo before your sed command to see where n why you are going wrong.

One way to go, assuming GNU sed, is:

# assuming default IFS
## based on Kusalananda's observations
set -f ;# disable globbing
list="2 5 7 10"
for i in $list;do
  echo "${i}p"
done | sed -nf - longText.txt

Just place an echo before your sed command to see where n why you are going wrong.

One way to go, assuming GNU sed, is:

# assuming default IFS
## based on Kusalananda's observations
set -f ;# disable globbing
list="2 5 7 10"
for i in $list;do
  echo "${i}p"
done | sed -nf - longText.txt 

## or per K.
# printf '%sp\n' $list | sed -nf - longText.txt