On 19 Nov 2025, at 11:57, Glenn Parker via mailmate wrote:
On 18 Nov 2025, at 17:21, Bill Cole wrote:
It strikes me as a very trivial "mission." An exported mailbox is
just text, so if you have an exported mailbox named 2025.mbox:
grep '^Subject: ' 2025.mbox | grep -o ' .*'
Will give you all the subjects without the leading "Subject:" tag
A little bit fancier. Strips out the filename and avoids a potential
shell error for large directories:
cd [message-folder]
find . -name '*.eml' -exec grep -h -m 1 '^Subject: ' {} + | sed
's/Subject: //'
Append the following to remove duplicate subjects:
| sort -su
Ah, but this will truncate long subject lines that are continued over
multiple lines.
Farewell grep, enter sed:
find . -name '*.eml' -exec \
sed -n -e '/^Subject: /!d' \
-e 's/^Subject: //' \
-e ':x' -e 'N' -e 's/\n */ /g' -e 'tx' -e 'P' -e 'b' {} \;
If you have a recent version of sed, i.e. gnu-sed aka “gsed”, this
can be written *somewhat* more legibly as:
find . -name '*.eml' -exec \
gsed -n -e '/^Subject: /!d
s/^Subject: //
:x; N; s/\n / */g; tx; P; b' {} \;
I’m not going to attempt to handle quoted-printable encoding in
subject lines. :-)
Glenn P. Parker
[email protected]
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