Samples

Pine Output Filter

I use this script as my default output filter in Pine 3.95. The list of recipients is placed as arguments (the $@, bash syntax) and the message body is on stdin. This checks that if there are some recipients (there aren't, generally, in newsgroup posts for example) that you have a public key for each of them, and if so encrypts and signs the message to stdout. Otherwise, it clearsigns the message to stdout.

#!/bin/sh
TMP=/tmp/pine_humbugf.$LOGNAME.$$.tmp

umask 077
cat - >$TMP

COMMAND=encrypt
LOOP=no
for TO in "$@"; do
    if pgp -kv 2>/dev/null | grep "$TO" >/dev/null 2>&1; then
      LOOP=yes
      true;
    else 
      COMMAND=sign
    fi
done

cat $TMP | (
  if [ $COMMAND = encrypt ] && [ $LOOP = yes ]; then
    pgpencrypt "$@" "aj@humbug.org.au"
  else
    pgpsign
  fi
)

rm $TMP

Pine Input Filter

This is my input filter. It checks for encrypted sections, and if it finds any pipes it through pgppipe, and also checks any signatures that happen to be in the file.

#!/bin/sh
TEMP="/tmp/pgp_filter.$LOGNAME.$$.tmp"

umask 077
cat > $TEMP

if grep >/dev/null 2>&1 "^-----BEGIN PGP MESSAGE-----" $TEMP; then 
  pgppipe < $TEMP > $TEMP.2
  mv $TEMP.2 $TEMP
fi

if grep >/dev/null 2>&1 "^-----BEGIN PGP SIGNATURE-----" $TEMP; then 
  (
    echo -----BEGIN PGP SIGNATURE CHECK----- 
    cat $TEMP | pgp -f +batchmode 2>&1 >/dev/null | tr -d "\a"
    echo -----END PGP SIGNATURE CHECK-----
  ) | cat $TEMP - | tr -d "\a" > $TEMP.2
  mv $TEMP.2 $TEMP
fi

cat $TEMP