Batch file convert to Linux script - linux

Question

due to migrating of batch job to Linux server I have problem finding the equivalent of the following commands in Linux:
Y drive is a map drive to the NAS drive which is also connected to Ubuntu server /NAS/CCTV . Need to search every sub folders for all .264 files
Z drive is on the Ubuntu server itself. Just move every .mp4 files here, no folder here. Path on Ubuntu is /Share/CCTV/
Its just a simple script to convert the cctv capture .264 format to mp4 and move to server to be process and delete off any h264 files and any folder thats older than 1 day, the script will schedule to run every 3 mins.
I have ffmpeg installed on the Ubuntu server, just unable to find the for each file in the folders to do the same.
Also for the last for files command that delete folder older than 1 days
FOR /r y:\ %%F in (*.h264) do c:\scripts\ffmpeg -i %%F %%F.mp4
FOR /r y:\ %%F in (*.h264) do del %%F
FOR /r y:\ %%G in (*.mp4) do move %%G Z:\
forfiles -p "Y:\" -d -1 -c "cmd /c IF #isdir == TRUE rd /S /Q #path"
Appreciate any forms of help or point me to the right guide so I can rewrite it on the Linux server. I did try to search for for loop but all show me to count number, maybe I search wrongly.

Answer 1

Find all .h264 files (recursively)
find /NAS/CCTV -type f -name '*.h264'
Convert all such files to .mp4
while IFS= read -d '' -r file ; do
ffmpeg -i "$file" "$file".mp4
done < <(find /NAS/CCTV -type f -name '*.h264' -print0)
Note that this will create files called like filename.h264.mp4. This matches your batch file behavior. If you would prefer to replace the extension use ffmpeg -i "$file" "${file%.*}".mp4 instead and you will get a name like filename.h264.
Also move those mp4 files to another directory
while IFS= read -d '' -r file ; do
ffmpeg -i "$file" "$file".mp4
if [[ -f $file.mp4 ]] ; then
mv -f -- "$file".mp4 /Share/CCTV
fi
done < <(find /NAS/CCTV -type f -name '*.h264' -print0)
Delete old directories (recursively)
find /NAS/CCTV -type d -not -newermt '1 day ago' -exec rm -rf {} +
Documentation.
The find command recursively lists files according to criteria you specify. Any time you need to deal with files in multiple directories or very large numbers of files it is probably what you want to use. For safety against malicious file names it's important to -print0 so file names are delimited by null rather than newline, which then requires using the IFS= read -d '' construct to interpret later.
The while read variable ; do ... done construct reads data from input and assigns each record to the named variable. This allows each matching file to be handled one at a time inside the loop. The insides of the loop should be fairly obvious.
Again find is used to select files, but in this case the files are directories. The switches -not -newer select files which are not newer (in other words, files which are older) according to their m time, the modification time, compared against t, which in this case means that the next argument is text describing a time. Here you can use any expression understood by GNU date's -d switch, so I can write in plain English and it will work as expected.
As you embark on your shell scripting journey you should keep two things by your side:
shellcheck - Always runs scripts you write through shellcheck to catch basic errors.
Bash FAQ - The bash FAQ at wooledge.org. Most of the answers to questions you have not thought of yet will be here. For example FAQ 15 is highly relevant to this question.

Answer 2

for f in /NAS/CCTV/*.h264; do ffmpeg -i "$f" "$f".mp4; done
rm /NAS/CCTV/*.h264
mv /NAS/CCTV/*.mp4 /Share/CCTV
find /NAS/CCTV/ -type d -ctime +1 -exec rm -rf {} \;