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I did this with this command:
git diff d62bd1^..d62bd1 | egrep '^old mode ' -C1 \
| tr '\n' ' ' | sed 's/diff --git/\n&/g' \
| sed -r 's|^diff --git a/([^ ]*) b/([^ ]*) old mode 100([0-9]*) new mode 100([0-9]*)|chmod \3 ./\1|' \
| bash
The first line finds all of the file-permission changes in the commit.
The second line squashes some newlines to get one line per file. This line
is in the format:
diff --git a/FILE b/FILE old mode OLDMODE new mode NEWMODE
The third line extracts the values from those lines and transforms the line
into:
chmod FILE ./OLDMODE
The fourth line (obviously) just executes the output.
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