Bash script string manipulation

Question

So I have a array of file names, that contain some tar files, So for example there are 2 file names in the array, acceptance-tests-0.0.134.tar and grafana-9.3.2-debian-11-r11.tar. How to we write a bash command that gets us, 0.0.134 from the first but 9.3.2-debian-11-r11 from the second ?

I tried {imageName##*-} that gives me the correct answer for the first 0.0.134 but just r11 for the second

Here is the list of the entire array, if someone needs it,

acceptance-tests-0.0.134.tar
alertmanager-0.25.0-debian-11-r4.tar
blackbox-exporter-0.23.0-debian-11-r10.tar
busybox-1.36.tar
cephcsi-v3.5.1.tar
csi-attacher-v3.4.0.tar
csi-node-driver-registrar-v2.4.0.tar
csi-provisioner-v3.1.0.tar
csi-resizer-v1.3.0.tar
csi-snapshotter-v4.2.0.tar
dashboard-test-0.0.134.tar
fluent-bit-2.0.8.tar
grafana-9.3.2-debian-11-r11.tar
graylog-5.0.2.tar
grm-test-0.0.134.tar
kube-state-metrics-2.7.0-debian-11-r9.tar
lrm-sim-test-0.0.134.tar
mongodb-6.0.4-debian-11-r0.tar
node-exporter-1.5.0-debian-11-r9.tar
opensearch-2.3.0.tar
pcs-sim-test-0.0.134.tar
postgresql-repmgr-15.1.0-debian-11-r22.tar
prometheus-2.41.0-debian-11-r5.tar
prometheus-operator-0.62.0-debian-11-r0.tar
sftp-5.1.5.tar
system-tests-0.0.134.tar

Are the filenames in an array or in a file, with one name per line? — Cyrus
– Cyrus, Commented Feb 28, 2023 at 14:56
How would you explain, with your own words and in plain English, what you want to achieve? What is the rule that tells which - is the last to remove? Once you'll have answered this, and checked that it works with all examples you have, coding will be much easier. — Renaud Pacalet
– Renaud Pacalet, Commented Feb 28, 2023 at 16:25

Ionuț G. Stan · Accepted Answer · 2023-02-28 15:03:14Z

1

Something like this:

#!/usr/bin/env bash

declare -a files=(
  acceptance-tests-0.0.134.tar
  grafana-9.3.2-debian-11-r11.tar
)

shopt -s extglob # enable extended pattern matching

for f in ${files[@]}; do
  f=${f##+([[:alpha:]-])}
  f=${f%.*}
  printf "$f\n"
done

Will produce:

0.0.134
9.3.2-debian-11-r11

answered Feb 28, 2023 at 15:03

Ionuț G. Stan

180k19 gold badges196 silver badges206 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

pynexj Over a year ago

OP may have not realized but it's very common for a pkg name to include digit chars (like python3).

Ionuț G. Stan Over a year ago

@pynexj absolutely, you're right. I will leave my answer as is, since your own already offers a better alternative.

ufopilot · Accepted Answer · 2023-03-01 10:35:39Z

0

$ awk '{ print gensub(/.*-(v?[0-9]+\..*).tar/,"\\1","g") }' <(printf "%s\n" "${myarray[@]}")

0.0.134
0.25.0-debian-11-r4
0.23.0-debian-11-r10
...

$ awk '{ printf "%s \n", $0; print gensub(/(.*)-(v?[0-9]+\..*).tar/,"\\1 ==> \\2","g") }' \
     <(printf "%s\n" "${myarray[@]}")

acceptance-tests-0.0.134.tar 
acceptance-tests ==> 0.0.134
alertmanager-0.25.0-debian-11-r4.tar
alertmanager ==> 0.25.0-debian-11-r4
blackbox-exporter-0.23.0-debian-11-r10.tar
blackbox-exporter ==> 0.23.0-debian-11-r10

answered Mar 1, 2023 at 10:35

ufopilot

3,9852 gold badges13 silver badges14 bronze badges

Comments

pjh · Accepted Answer · 2023-03-01 23:10:34Z

Try this Shellcheck-clean pure Bash code:

#! /bin/bash -p

tarfiles=(  acceptance-tests-0.0.134.tar
            alertmanager-0.25.0-debian-11-r4.tar
            blackbox-exporter-0.23.0-debian-11-r10.tar
            busybox-1.36.tar
            cephcsi-v3.5.1.tar
            csi-attacher-v3.4.0.tar
            csi-node-driver-registrar-v2.4.0.tar
            csi-provisioner-v3.1.0.tar
            csi-resizer-v1.3.0.tar
            csi-snapshotter-v4.2.0.tar
            dashboard-test-0.0.134.tar
            fluent-bit-2.0.8.tar
            grafana-9.3.2-debian-11-r11.tar
            graylog-5.0.2.tar
            grm-test-0.0.134.tar
            kube-state-metrics-2.7.0-debian-11-r9.tar
            lrm-sim-test-0.0.134.tar
            mongodb-6.0.4-debian-11-r0.tar
            node-exporter-1.5.0-debian-11-r9.tar
            opensearch-2.3.0.tar
            pcs-sim-test-0.0.134.tar
            postgresql-repmgr-15.1.0-debian-11-r22.tar
            prometheus-2.41.0-debian-11-r5.tar
            prometheus-operator-0.62.0-debian-11-r0.tar
            sftp-5.1.5.tar
            system-tests-0.0.134.tar                        )

shopt -s extglob
for tf in "${tarfiles[@]}"; do
    name_ver=${tf%.tar}
    name=${name_ver%%-@(v[0-9]|[0-9])*}
    if [[ $name == "$name_ver" ]]; then
        printf 'ERROR: Cannot extract version from: %q\n' "$tf" >&2
    else
        ver=${name_ver#"$name"-}
        printf '%s => %s\n' "$tf" "$ver"
    fi
done

shopt -s extglob enables "extended globbing" (including patterns like @(v[0-9]|[0-9])). See the extglob section in glob - Greg's Wiki.
See Removing part of a string (BashFAQ/100 (How do I do string manipulation in bash?)) for an explanation of ${var%pat}, ${var%%pat}, and ${var#pat}.

Collectives™ on Stack Overflow

Bash script string manipulation

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related