/usr/lib/ssl/misc/c_issuer is in openssl 1.0.2g-1ubuntu4.15.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #!/bin/sh
#
# print out the issuer
#
for i in $*
do
n=`openssl x509 -issuer -noout -in $i`
echo "$i $n"
done
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