I'm running into a weird problem with sed. I believe what I'm trying to do
should work fine, but seem to be stymied by weirdness in sed's argument
processing. This is on 8.2-RELEASE-p2.
> which sed
/usr/bin/sed
According to years of experience and re-reading the man page five times today
this should work, however sed is treating the second -e as a file name:
> sed -i'' -e 's/^\(REVOKE ALL ON SCHEMA public FROM \)postgres/\1pgsql/' \
? -e 's/^\(GRANT ALL ON SCHEMA public TO \)postgres/\1pgsql/' \
? /tmp/pgdump
sed: -e: No such file or directory
If I drop the second -e it seems to work (the permission denied is expected):
> sed -i'' -e 's/^\(REVOKE ALL ON SCHEMA public FROM \)postgres/\1pgsql/' \
? /tmp/pgdump
sed: /tmp/pgdump: Permission denied
This is contrary to the sed man page:
A single command may be specified as the first argument to sed. Multiple
commands may be specified by using the -e or -f options. All commands
are applied to the input in the order they are specified regardless of
their origin.
I thought maybe it was an argument order problem, since -i is listed after -e
in the syntax synopsis (sometimes that matters) but that is actually even
weirder:
sed -e 's/^\(REVOKE ALL ON SCHEMA public FROM \)postgres/\1pgsql/' \
-e 's/^\(GRANT ALL ON SCHEMA public TO \)postgres/\1pgsql/' \
-i'' /tmp/pgdump
sed: -I or -i may not be used with stdin
Fiddling around some more, I found that -e can't be supplied for the first
command if there are multiple commands to be given.. but it does work if
there's only one. That doesn't seem right.
sed -i'' 's/^\(REVOKE ALL ON SCHEMA public FROM \)postgres/\1pgsql/' \
-e 's/^\(GRANT ALL ON SCHEMA public TO \)postgres/\1pgsql/' \
/tmp/pgdump
sed: /tmp/pgdump: Permission denied
However, that breaks again if -i is moved:
> sed 's/^\(REVOKE ALL ON SCHEMA public FROM \)postgres/\1pgsql/' \
-e 's/^\(GRANT ALL ON SCHEMA public TO \)postgres/\1pgsql/' \
-i'' /tmp/pgdump
sed: -e: No such file or directory
sed: s/^\(GRANT ALL ON SCHEMA public TO \)postgres/\1pgsql/: No such file or
directory
sed: -i: No such file or directory
sed: /tmp/pgdump: Permission denied
I'm fairly certain this has worked the way I'm expecting it to in the past.
After all, I wrote it this way out of habit. Either way, it seems to me that
argument processing in the current sed distributed with the OS is broken with
respect to the way it's documented. Or am I missing something?
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