Get files in bash script that contain an underscore

In a directory with a bunch of files that look like this:

./test1_November 08, 2014 AM.flv
./test2.flv
./script1.sh
./script2.sh

I want to process only files that have an .flv extension and no underscore. I'm trying to eliminate the files with underscores without much luck.

bash --version
GNU bash, version 4.2.37(1)-release (x86_64-pc-linux-gnu)

script:

#!/bin/bash

FILES=$(find . -mtime 0) 
for f in "${FILES}"
do
        if [[ "$f" != *_* ]]; then
                echo "$f"
        fi
done

This gives me no files. Changing the != to == gives me all files instead of just those with an underscore. Other answers on SO indicate this should work.

Am I missing something simple here?

---

You can use this extended glob pattern:

shopt -s extglob
echo +([^_]).flv

+([^_]) will match 1 or more of any non underscore character.

Testing:

ls -l *flv
-rw-r--r-- 1 user1 staff 0 Nov  8 12:44 test1_November 08, 2014 AM.flv
-rw-r--r-- 1 user1 staff 0 Nov  8 12:44 test2.flv

echo +([^_]).flv
test2.flv

To process these files in a loop use:

for f in +([^_]).flv; do
   echo "Processing: $f"
done

PS: Not sure you're using -mtime 0 in your find as my answer is for the requiremnt:

I want to process only files that have an .flv extension and no underscore

---

You can pass multiple patterns to find and include a not

find . -name "*.flv" -not -name "*_*"

You can loop over the results of find by piping it into a while

find -name "*.flv" -not -name "*_*" -print0 | while IFS= read -r -d '' filename; do
    echo "$filename"
done

or you can forgo the loop completely and use xargs

find -name "*.flv" -not -name "*_*" -print0 | xargs -0 -n1 echo

---

The problem is this line:

for f in "${FILES}"

The quotes are preventing word splitting, so entire list of filenames is being processed as a single item. What you want is:

IFS=$'n'
for f in $FILES

The IFS setting makes it use newlines as the word delimiters, so you can have filenames with spaces in them.

A better way to write loops like this is to avoid using the variable:

find ... | while read -r f
do
    ...
done

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