Compare a list of strings in Bash - linux

Question

I have a list of rpm files in a file called rpmlist.txt which I have to compare with another list, newlist.txt, and see if they are same in Bash. For example, this is my requirement:
files inside rpmlist.txt
bash-4.4-9.10.1_x86_64
binutils-2.32-7.8.1_x86_64
bison-3.0.4-1.268_x86_64
files inside newlist.txt
bash-5.4-9.10.1_x86_64
binutils-2.32-7.8.1_x86_64
bison-6.0.4-1.268_x86_64
And print if they are matching or not. Any help would be appreciated

Answer 1

Try with:
#!/bin/bash
# Load files into arrays
readarray source_list < rpmlist.txt
readarray target_list < newlist.txt
# Check files size
source_size=${#source_list[#]}
target_size=${#target_list[#]}
if [ ${source_size} -ne ${target_size} ]; then
echo "File lines count not matching!" >&2
exit 1
fi
# Enum files
for (( i=0; i < ${source_size}; i++ )); do
# Get file name
source_file=${source_list[$i]}
target_file=${target_list[$i]}
# Remove CR/LF
source_file=$(echo "${source_file}" | sed 's:\r$::')
target_file=$(echo "${target_file}" | sed 's:\r$::')
# Check if files exist
if [ ! -f ${source_file} ] || [ ! -f ${target_file} ]; then
echo "Source and/or Target does not exist." >&2
exit 2
fi
# Compare files
diff -q "${source_file}" "${target_file}"
done
PS: I tested it and it works.
Edit (1)
Based on comments, I think you should replace my script with the following simple command:
cat rpmlist.txt | xargs -I "{}" grep "{}" newlist.txt
Edit (2) - Unmatched list
cat rpmlist.txt | xargs -I "{}" grep -v "{}" newlist.txt

Answer 2

This will cross-compare an arbitrary number of such files.
#!/bin/bash
set -e
declare -ar list_names=("$#")
declare -Ai "${list_names[#]}"
for list in "${list_names[#]}"; do
declare -n set="$list"
while IFS= read -r line; do
((++set["$line"]))
done < "${list}.txt"
done
compare_lists() {
local -rn set1="$1"
local -rn set2="$2"
local name
echo "Lines in ${1}, but not in ${2}:"
for name in "${!set1[#]}"; do
((set2["${name}"])) || printf ' %s\n' "$name"
done
}
declare -i idx jdx
for ((idx = 0; idx < ${#list_names[#]}; ++idx)); do
for ((jdx = idx + 1; jdx < ${#list_names[#]}; ++jdx)); do
compare_lists "${list_names[idx]}" "${list_names[jdx]}"
compare_lists "${list_names[jdx]}" "${list_names[idx]}"
done
done
Example (when the above script is called listdiff.sh):
$ ./listdiff.sh rpmlist newlist
Lines in rpmlist, but not in newlist:
bison-3.0.4-1.268_x86_64
bash-4.4-9.10.1_x86_64
Lines in newlist, but not in rpmlist:
bison-6.0.4-1.268_x86_64
bash-5.4-9.10.1_x86_64
And it can get more arguments than 2.