Bash: variable from file match regex

Question

My script goes as follow:

Search for all the isos available under some path
Compare the isos names to a list in a file
Return only the matches

To abreviate, the code is:

isos_found=() # here we save the isos
isos_search=<find isos>
mapfile -t supported_isos < supported_systems # see below
for iso in "${isos_search[@]}" ; do
  [[ "${supported_isos[@]}" =~ "$(basename "$iso")"  ]] && isos_found+=("$iso")
done

Where supported_systems is a file with the contents:

clonezilla-live-2.6.1-25-amd64.iso
debian-live-10.0.0-amd64-xfce+nonfree.iso
linuxmint-19.1-cinnamon-64bit.iso
linuxmint-19.1-xfce-32bit.iso
lubuntu-18.04-alternate-amd64.iso

Now I would like that the file supported_systems had the content like this:

clonezilla*
debian*
linuxmint*
lubuntu*

So I have to match only the name of the distro without harcoding every version/release.

Using code similar to the one above ("${supported_isos[@]}" =~ "$(basename "$iso")") is this possible? If not, I'm open to suggestions.

Kusalananda · Accepted Answer · 2019-12-18 07:22:45Z

Assuming that your supported_systems file contains prefix strings (not patterns) like

clonezilla
debian
linuxmint
lubuntu

Then you could simply read these string and use them in a file glob match instead of first trying to find all ISO files and then manually go through an see whether they match some pattern.

shopt -s dotglob nullglob globstar

isos=()
while IFS= read -r prefix; do
        isos+=( ./**/"$prefix"-*.iso )
done <supported_systems

printf '%s\n' "${isos[@]}"

If you do want to find all ISO files first and then go through them to find the ones that match any of the prefixes, then you could use

shopt -s dotglob nullglob globstar

isos=( ./**/*.iso )
while IFS= read -r prefix; do
        for iso in "${isos[@]}"; do
                if [[ $iso =~ /"$prefix"-[^/]*$ ]]; then
                        matched_isos+=( "$iso" )
                fi
        done
done <supported_systems

printf '%s\n' "${matched_isos[@]}"

Here, the regular expression /"$prefix"-[^/]*$ would match any base name that starts with a given $prefix (followed by -).

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