GREP: exclude file extensions in specific directory - bash

Question

My code takes added, modified, deleted, renamed, copied files from git status -s and compare them with the list of file paths from the file.
git status -s |
grep -E "^M|^D|^A|^R|^C" |
awk '{if ($1~/M+/ || $1~/D+/ || $1~/A+/ || $1~/R+/ || $1~/C+/) print $2}' |
grep --file=$list_of_files --fixed-strings |
grep -r --exclude="*.jar" "SVCS/bus/projects/Resources/"
Prints out git status like M foo.txt
Does some "filtering" operations
More filtering operations
Takes path to files for compare from the text file
Here I am trying to make so the last step would exclude .jar files from specific directory.
How can I do the last step? Or need to add something to the 4th step?

Answer 1

The simple fix is to change the last line to
grep -v 'SVCS/bus/projects/Resources/.*\.jar$'
but that really is some horrible code you have there.
Keeping in mind that grep | awk and awk | grep is an antipattern, how about this refactoring?
git status -s |
grep -E "^M|^D|^A|^R|^C" |
awk '{if ($1~/M+/ || $1~/D+/ || $1~/A+/ || $1~/R+/ || $1~/C+/)
... Hang on, what's the point of that? The grep already made sure that $1 contains one or more of those letters. The + quantifier is completely redundant here.
print $2}'
Will break on files with whitespace in them. This is a very common error which is aggravating because a lot of the time, the programmer knew it would break, but just figured "can't happen here".
git status -s | awk 'NR==FNR { files[$0] = 1; next }
/^[MDARC]/ { gsub(/^[MDARC]+ /, "");
if ($0 ~ /SVCS\/bus\/projects\/Resources\/.*\.jar$/)
next;
if ($0 in files) print }' "$list_of_files" -
The NR==FNR thing is a common idiom to read the first file into an array, then fall through to the next input file. So we read $list_of_files into the keys of the associative array files; then if the file name we read from git status is present in the keys, we print it. The condition to skip .jar files in a particular path is then a simple addition to this Awk script.
This assumes $list_of_files really is a list of actual files, as suggested by the file name. Your code will look for a match anywhere in that file, so a partial file name would also match (for example, if the file contains path/to/ick, a file named somepath/to/icktys/mackerel would match, and thus be printed). If that is the intended functionality, the above script will require some rather drastic modifications.