In my main_dir, I have a lot of sub-folders say DFT1 to DFT150, and in each directory, there is a file named OSZICAR. However, some of this would have file size 0.
So I would like to have a script, that goes into each folder and checks the size of OSZICAR, if it is below size of 10 bytes, then delete its DFT folder.
The pseudo-code (which doesn't work), I have is:
for f in *; do
cd $f
status=(check whether OZICAR has size below 10bytes)
cd ..
if (status); do
rm -r $f
fi
done
Use find:
find DFT*/OSZICAR -size -10c -printf "%h\0" | xargs -r0 rm -r
find searches for all files inside a DFT* directory called OSZICAR, whose file size is below 10 bytes; the c means bytes.find prints the directory name %h where the file was found (DFT105 for instance), terminated by a nullbyte \0xargs which reads the line terminated by a nullbyte -0 and calls rm -r on every of them.I recommend to call the command without the xargs part, to check if everything works correctly, before deleting anything.
Edit: If your find doesn't accept the -printf (like OSX) option, use this instead:
find DFT*/OSZICAR -size -10c -exec sh -c 'rm -r $(dirname "$1")' sh {} \;
man dirname
if [ ! -s file ] ; then. Citingman bash: " -s file True if file exists and has a size greater than zero." I.e.-s= look for non-empty files.