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With for and IFS:

#!/bin/bash

IFS=$'\n'       # make newlines the only separator
set -f          # disable globbing
for i in $(cat < "$1"); do
  echo "tester: $i"
done

Note however that it will skip empty lines as newline being an IFS-white-space character, sequences of it count as 1 and the leading and trailing ones are ignored. With zsh and ksh93 (not bash), you can change it to IFS=$'\n\n' for newline not to be treated specially, however note that all trailing newline characters (so that includes trailing empty lines) will always be removed by the command substitution.

Or with read (no more cat):

#!/bin/bash

while IFS= read -r line; do
  echo "tester: $line"
done < "$1"

There, empty lines are preserved, but note that it would skip the last line if it was not properly delimited by a newline character.

With for and IFS:

#!/bin/bash

IFS=$'\n'       # make newlines the only separator
set -f          # disable globbing
for i in $(cat < "$1"); do
  echo "tester: $i"
done

Note however that it will skip empty lines as newline being an IFS-white-space character, sequences of it count as 1 and the leading and trailing ones are ignored. With zsh and ksh93 (not bash), you can change it to IFS=$'\n\n' for newline not to be treated specially, however note that all trailing newline characters (so that includes trailing empty lines) will always be removed by the command substitution.

Or with read (no more cat):

#!/bin/bash

while IFS= read -r line; do
  echo "tester: $line"
done < "$1"

There, empty lines are preserved, but note that it would skip the last line if it was not properly delimited by a newline character.

With for and IFS:

#!/bin/bash

IFS=$'\n'       # make newlines the only separator
set -f          # disable globbing
for i in $(cat < "$1"); do
  echo "tester: $i"
done

Or with read (no more cat):

#!/bin/bash

while IFS= read -r line; do
  echo "tester: $line"
done < "$1"

With for and IFS:

#!/bin/bash

IFS=$'\n'       # make newlines the only separator
set -f          # disable globbing
for i in $(cat < "$1"); do
  echo "tester: $i"
done

Note however that it will skip empty lines as newline being an IFS-white-space character, sequences of it count as 1 and the leading and trailing ones are ignored. With zsh and ksh93 (not bash), you can change it to IFS=$'\n\n' for newline not to be treated specially, however note that all trailing newline characters (so that includes trailing empty lines) will always be removed by the command substitution.

Or with read (no more cat):

#!/bin/bash

while IFS= read -r line; do
  echo "tester: $line"
done < "$1"

There, empty lines are preserved, but note that it would skip the last line if it was not properly delimited by a newline character.

With for and IFS:

#!/bin/bash

IFS=$'\n'       # make newlines the only separator
set -f          # disable globbing
for i in $(cat "$1"); do
  echo "tester: $i"
done

Or with read (no more cat):

#!/bin/bash

while IFS= read -r line; do
  echo "tester: $line"
done < "$1"

With for and IFS:

#!/bin/bash

IFS=$'\n'       # make newlines the only separator
set -f          # disable globbing
for i in $(cat < "$1"); do
  echo "tester: $i"
done

Or with read (no more cat):

#!/bin/bash

while IFS= read -r line; do
  echo "tester: $line"
done < "$1"