# Pastebin cG4ksCZ9
# Q:  are files in lib2 contained in lib?  

# below has 34 files 
ls -1 --color=none ../foo/lib2/ > /tmp/lib2.txt

# below has 166 files
ls -1 --color=none lib/ > /tmp/lib.txt

# Find what files if any in lib2 are contained in lib
git diff --color=never --word-diff /tmp/lib{2,}.txt | egrep '^\w' | sed -n '3,$p' > /tmp/libs_common_to_both_libs_and_lib2.txt
# raw git diff output (with line #s) looks something like:  
# 1 diff --git a/tmp/lib2.txt b/tmp/lib.txt
# 2 index 6407082..4a23e01 100644
# 3 --- a/tmp/lib2.txt
# 4 +++ b/tmp/lib.txt
# 5 @@ -1,5 +1,74 @@
# 6 {+foo-1.14.jar+}
# 7 bar-2.3.jar
# 8 {+baz-3.14.jar+}
# ...
# egrep filters out all lines that don't begin with a word char (2-4,5,7,etc.)
# the sed command is to strip header (1-2)  

# compare what's common to both with original lib2 list to find what's extra
git diff --color=never --word-diff /tmp/lib{s_common_to_both_libs_and_lib2,2}.txt
# raw git diff output (with line #s) looks something like:  
# 1 diff --git a/tmp/libs_common_to_both_libs_and_lib2.txt b/tmp/lib.txt
# 2 index 6407082..4a23e01 100644
# 3 --- a/tmp/libs_common_to_both_libs_and_lib2.txt
# 4 +++ b/tmp/lib.txt
# 5 @@ -1,5 +1,74 @@
# 6 {+foo-1.14.jar+}
# 7 bar-2.3.jar
# 8 {+baz-3.14.jar+}
# ...

# files prefixed with {+ == files that are missing from lib2 list?