executing find command with a file having directory list

Question

I have a big file which contains directories paths like below:

$PRJ/fp/t/mxl/lf/
$PRJ/fp/t/mxl/lf/

I want to read this file line by line and list out all the files inside each directory file in a line in output file.

I can use find command with directory path directory specify but how to use it with a file having directory paths is something I want. find input_file -type f does not work.

There are no nested directories inside. The input file have directory path which just have files inside it. — Shreya, Aug 02 '22 at 12:11
Does this answer your question? [How do you run a command eg chmod, for each line of a file?](https://stackoverflow.com/questions/13939038/how-do-you-run-a-command-eg-chmod-for-each-line-of-a-file) — F. Hauri - Give Up GitHub, Aug 02 '22 at 14:29
Please don't multi-post: https://unix.stackexchange.com/q/712147/133219 — Ed Morton, Aug 02 '22 at 16:11

score 2 · Accepted Answer · answered Aug 02 '22 at 14:02

2

while IFS= read -r dir; do
    find "$dir" -type f
done < <(envsubst < my_big_file)

See https://unix.stackexchange.com/a/294400/133219 and the man page for more info on envsubst.

answered Aug 02 '22 at 14:02

Ed Morton

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Interesting solution. I believe `$PRJ_WORK_DIR` should be set as an environmental variable for this to work. If that's not the case, `eval` is other more dangerous alternative. – r_31415 Aug 02 '22 at 22:02

executing find command with a file having directory list

1 Answers1