NAME

     msed — manipulate message headers

SYNOPSIS

     msed script [msgs ...]

DESCRIPTION

     msed prints the messages msgs with message headers transformed by the commands in script.
     (See mmsg(7) for the message argument syntax.)  If no msgs are passed, msed will default to
     the current message.

     msed scripts are akin to a subset of sed(1) scripts, but optimized for modifying messages.
     Note that msed unfolds and normalizes message headers, so they may need to be passed through
     mmime(7) to ensure RFC 5322 conformance.  The message body is not affected.

     msed supports the following commands.  The separators after the command letter may be
     substituted with an arbitrary symbol, just as in sed(1).  Multiple commands can be separated
     by ‘;’.

     /header/a/value/
             If the header ‘header:’ is not set in the message, add it with the given value.

     /headers/c/value/
             Change colon-separated headers matching the regular expression headers, with
             implicit anchoring to the header name, to the value given in value.

     /headers/d
             Delete colon-separated headers matching the regular expression headers, with
             implicit anchoring to the header name.  Use explicit ‘.*’ to match arbitrary strings
             at the beginning or end of the headers.

             For example, ‘/x-.*/d’ will delete all headers starting with ‘X-’ (always case
             insensitive), and ‘/from:to:cc/d’ will delete the headers ‘From:’, ‘To:’, and ‘Cc:’.

     [/headers/]s/regex/replacement/[flags]
             Substitute matches of the POSIX Basic Regular Expression regex in headers matching
             the POSIX Basic Regular Expression headers, with implicit anchoring to the header
             name (or all headers, if omitted), with the string replacement, expanding ‘&’ to the
             matched string, and ‘\N’ to the Nth sub-expression, where N is between 1 and 9.

             If flags contains the letter ‘d’, the header is removed if regex matched.

             By default, only the first match is replaced, unless flags contains the letter ‘g’.

             By default, regex is matched case sensitively, unless flags contains the letter ‘i’.

EXIT STATUS

     The msed utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     sed(1), mhdr(1), mmsg(7), regex(7) / re_format(7)

AUTHORS

     Leah Neukirchen <leah@vuxu.org>

LICENSE

     msed is in the public domain.

     To the extent possible under law, the creator of this work has waived all copyright and
     related or neighboring rights to this work.

     http://creativecommons.org/publicdomain/zero/1.0/