Explanation needed on a "find | awk" command (Linux)

Question

I am trying to figure out the command below;

find ./ -type f |
awk -F / -v OFS=/ '{$NF="";dir[0ドル]++} END {for (i in dir) print dir[i]i}'

the output is like:

6./Release_1_18_1_0_06_26/metadata/3_Control_Files/ 
5./Release_1_18_1_0_06_26/metadata/7_SAS_Code/ 
5./Release_1_18_1_0_06_26/others/1_content/ 
1./.cache/pip/selfcheck/ 
2./Release_1_18_1_0_06_26/metadata/5_Status/ 
1./Release_1_18_1_0_06_26/compute/2_packages/ 
1./sasuser.v94/ 
4./metadata/FR1_Release_1.17.1.1/3_Control_Files/ 
4./Release_1_18_1_0_06_26/metadata/6_Patches/ 

This command am counting the number of incode in the current path. However, I did not understand {$NF="";dir[0ドル]++} END {for (i in dir) print dir[i]i}, especially dir[0ドル]. anyone can explain that?

Answer 1

Could you please go through following, detailed explanation of OP's code here.

find ./ -type f | ##Running find command to find files in current directory and passing output as input to awk command.
awk -F / -v OFS=/ ' ##Running awk command setting field separator and output field separator as /
{
 $NF="" ##Nullifying last field of current line here.
 dir[0ドル]++ ##creating array dir with current line and keep increasing its value with one here.
}
END{ ##starting END block of this code here.
 for(i in dir){ ##traversing through dir array here.
 print dir[i]i ##printing index of dir array and it's index here.
 }
}'

NOTE:END block of any awk code is executed when Input_file is being done with reading at last.

• d_vincent: Nice. dir[0ドル] can remember the last count for its line, That is why the array can increase the value.

Answer 2

The -F / tells awk to split the line by slashes. 0ドル is the whole line.

$NF="" replaces the last item on the line (in this case the filename) with blank.

Then dir[0ドル]++ takes the whole line (after the filename as been removed) and uses that as the index into a hash, incrementing that value by one. Effectively counting the number of items that had the same path.

The END block loops through all keys in the dir[] hash printing first the count, then the directory name.