如何在bash中循环包含通配符的目录列表？

Question

Assuming that I have a directory which contains decades of subdirectories:

$ ls -d /very/long/path/*/
adir1/ adir2/ b2dir/ b3dir/ k101/ k102/ k103/ k104/ k220/ k221/ k222/ etc

I would like to loop over a selection of directories which will be defined "dynamically" based on the answer given by the user and it will contain wildcards. For example (the code that doesn't work):

$ cat my_script.sh

DATADIR="/very/long/path"
echo -n "Select dirs to involve: "
read dirlist
for DIR in "$dirlist"; do
  echo $DATADIR/$DIR 
  [do stuff]
  ...
done

What would be desired is the following:

$ ./my_script.sh
Select dirs to involve: a* k10?

/very/long/path/adir1
/very/long/path/adir2
/very/long/path/k101
/very/long/path/k102
/very/long/path/k103
/very/long/path/k104

Any hint?

Answer 1

One potential solution is to use find :

#!/bin/bash
DATADIR="/very/long/path"
echo -n "Select matching expression: "
IFS= read -r dirlist
while IFS read -r -d '' DIR; do
  echo "$DIR"
  [do stuff]
  ...
done < <(find "$DATADIR" -path "$dirlist" -print0)

I would advise that you read the manpage of find , as matching will eat up slashes, and might not behave as you are used to with shell globbing.

Please note that using the -print0 and read -d'' is a way to make sure files with funny names (whitespace, newlines) are handled without issues.

If you want to be able to handle several expressions input at the same time, you would have to do something like this :

#!/bin/bash
DATADIR="/very/long/path"
echo -n "Select matching expression: "
IFS= read -r -a dirlist_array
for dirlist in "${dirlist_array[@]}" ; do
  while IFS read -r -d '' DIR; do
    echo "$DIR"
    [do stuff]
    ...
  done < <(find "$DATADIR" -path "$dirlist" -print0)
done

Answer 2

Not sure if this would run into problems, but give it a whirl:

DATADIR="/very/long/path"

read -r -p "Select dirs to involve: " -a dirs

cd $DATADIR

for dir in ${dirs[@]}
do
    echo "$dir"
done

Leaving the array unquoted allows for the globs to expand.

UPDATE: Dual loop to allow for using directory location

DATADIR="/very/long/path"

read -r -p "Select dirs to involve: " -a dirs

for item in "${dirs[@]}"
do
  for dir in "$DATADIR/"$item
  do
    echo "$dir"
  done
done