Run a function on all filenames in a list - bash

Question

I use ag to select filenames and pipe them into fzy with the following script
set "$(ag -g "\.gz$" archives/ | fzy )"
echo "selected file: $1"
How can I run a function on all files in the folder archives , so only files in are selected, that are newer than already existing files with the same name the folder itp-files/? and pipe only those into fzy then?
I tried something like
for f in $(ag --nonumbers -g "\.gz$" archives/); do
echo do something with $f and only output if file is older than the same in itp-files/;
done | fzy
But I am not sure how to compare the filetimes ike this

Answer 1

I tried something like
for f in $(ag --nonumbers -g "\.gz$" archives/); do
echo do something with $f and only output if file is older than the same in tmp/;
done | fzy
But I am not sure how to compare the filetimes ike this
If you like your construction for ... in ... with ag, you may compare timestamps like this:
for f in $(ag --nonumbers -g "\.gz$" archives/); do
fn=$(basename $f)
if [ $f -ot tmp/$fn ]; then
fzy $f
fi
done
Ajust full path of tmp folder, if needed.
-ot means "older than".
Narrowed solution (to provide a list of newline-separated items for fzy):
find archives -iname "*.gz" -type f -printf "%f\n" | \
xargs -I '{}' find itp-files -name '{}' -type f -newer '{}' -printf "%f\n" | \
sort | \
fzy

Answer 2

You can use the xargs command to run a command on each line of output.
For example: find . -name '*.bak' -type f -print | xargs rm -r will remove all files that end in .bak

Answer 3

I believe you need the find -exec approach, something like:
find /directory -name "*.gz" -mtime +5 -exec ag -g {} \; | fzy
This means:
Search within the /directory
The name of the file needs to end with .gz (file extension)
The last modification date needs to be older than 5 days (can be altered according to your wishes)
-exec ag -g {} : executed the ag command, using the -g switch, on the find result ({}).
\; ends the -exec part.
You can launch the fzy command on the results.
Feel free to add comments in case you have doubts.