In bash, how to store top-level dirs in an array for post-processing?-CodePudding

I'm trying to get a list of my top-level dirs in a subdir, so I can post process them, e.g., delete certain ones. I have

# List the top-level dirs and create an array with the resul
DIRS=`ls -1`
IFS=$'\n' read -ra TOP_DIRS <<< "$DIRS"

# Iterate the array
for D in "${TOP_DIRS[@]}"; do
    # For now, just echo the dirs
    echo $D
done

The ls -1 command gives me this for example

00 PRM - AUTO GA
00 PRM - AUTO GA Prod
00 PRM - AUTO GA Prod@script
00 PRM - AUTO GA Prod@script@tmp
00 PRM - AUTO GA STG
00 PRM - AUTO GA STG@script
00 PRM - AUTO GA STG@script@tmp

However, the for loop only echoes the first value, that is

$ ./clean_workspace.sh 
00 PRM - AUTO GA

So obviously my IFS statement is wrong. What am I missing? TIA!

CodePudding user response：

There's no need for ls. Just use a wildcard in an array literal.

top_dirs=(*)

BTW, it's bad style to use uppercase names for your variables. These are conventionally reserved for environment variables.

CodePudding user response：

Just addressing the issue of why OP's current code only processes one directory ...

read is designed to read a single line of input so OP's current code only reads in and stores the first directory:

$ IFS=$'\n' read -ra TOP_DIRS <<< "$DIRS"
$ typeset -p TOP_DIRS
declare -a TOP_DIRS=([0]="00 PRM - AUTO GA")

mapfile is designed to process multiple lines of input, storing each line in a new array entry, eg:

$ mapfile -t TOP_DIRS <<< "$DIRS"
$ typeset -p TOP_DIRS
declare -a TOP_DIRS=([0]="00 PRM - AUTO GA" [1]="00 PRM - AUTO GA Prod" [2]="00 PRM - AUTO GA Prod@script" [3]="00 PRM - AUTO GA Prod@script@tmp" [4]="00 PRM - AUTO GA STG" [5]="00 PRM - AUTO GA STG@script" [6]="00 PRM - AUTO GA STG@script@tmp")

NOTE: this doesn't negate the comment/link about why you shouldn't try to parse ls