I want to do search through a bunch of directories to find missing files. The format of the directories and files is YYYY/MM/file_name_YYYYMMDD.csv. So what I want to do is something like:

for date in `list_of_dates.txt`
 if [! -f /YYYY/MM/file_name_YYYYMMDD.csv]
   echo $date

What I can't figure out how to do is make each iteration look for the right file in the right directory. Is there a way to do this in a bash script?

  • The question is a bit uncertain to me. How do you define a "missing file"? Do you want to list all files that do not follow the pattern you described? – vatsug Jan 27 '17 at 15:52
  • Dose the file contain only the filenames on the format file_name_YYYYMMDD.csv or is there a path as well? – Kusalananda Jan 27 '17 at 16:09
  • The list_of_dates.txt file, what does it contain? – Kusalananda Jan 27 '17 at 16:11
  • list_of_dates.txt is a text file that just has a list of strings representing the dates for which I expect there to be a file. A file is "missing" if I expect there to be a file for that date, but can't find a file matching the pattern. – Gree Tree Python Jan 27 '17 at 16:17
  • @GreeTreePython It's difficult to write a solution when the data is unknown. A date can have many many different formats... – Kusalananda Jan 27 '17 at 16:18
for dir in ????/??; do
    days=$(cal "$month" "$year" | awk 'NF {DAYS = $NF}; END {print DAYS}') 
    for date in seq 1 "$days"; do
        if [[ ! -f /"$year"/"$month"/"$filename" ]]; then
            echo "$filename is missing."
  • cool +1 or even days=$(($(cal $mon $year | wc -w) -9)) – JJoao Jan 28 '17 at 8:53

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