How to optionally show a progress bar, i.e. stop and show error output in a bash script?

Question

I successfully use the python tool tqdm to display a nice progress bar for e.g. unzipping a large file. However I don't know how to stop that and showing errors from the unzip command if any.

#!/bin/bash
function progressBarFiles() {
    local total_files="$1"
    if hash tqdm 2>/dev/null; then
        tqdm --total $total_files --unit files --desc counting | wc -l >/dev/null
    else
        cat
    fi
}
unzip -o huge.zip | progressBarFiles 1697

Currently I have the case of unzipping in a network folder fails due to file permission changes failing:

counting:   1%|█▉                   | 22/1697 [00:00<00:28, 58.36files/s]
chmod (directory attributes) error: Permission denied
chmod (directory attributes) error: Permission denied
chmod (directory attributes) error: Permission denied
counting:   2%|██▎                  | 26/1697 [00:00<00:35, 46.64files/s]
chmod (directory attributes) error: Permission denied

I would like to stop the script after the progress bar and print this error output all together instead of at the moment in unzipping (which breaks the progress bar).

PS: Is the idea with cat to have that progress bar completely optional improvable?

Redirect stderr of the `unzip` to a temp file, cat it to stderr after it's finished. — choroba, Jun 18 '18 at 09:49

score 1 · Accepted Answer · answered Jul 02 '18 at 13:14

1

Solved this as stated in the comment with redirecting, but with a clean temporary file that will be deleted 100%, see https://stackoverflow.com/a/51137057/1184842 for more details.

answered Jul 02 '18 at 13:14

jan

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How to optionally show a progress bar, i.e. stop and show error output in a bash script?

1 Answers1