mirror of
https://github.com/leahneukirchen/mblaze
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130 lines
2.7 KiB
Groff
130 lines
2.7 KiB
Groff
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.Dd August 1, 2016
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.Dt MSED 1
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.Os
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.Sh NAME
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.Nm msed
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.Nd stream editor for transforming mail
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.Sh SYNOPSIS
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.Nm
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.Ar script
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.Op Ar msgs\ ...
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.Sh DESCRIPTION
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.Nm
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prints the messages
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.Ar msgs
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with mail headers transformed by the commands in
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.Ar scripts .
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See
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.Xr mmsg 7
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for the message argument syntax.
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If no
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.Ar msgs
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are passed,
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.Nm
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will default to the current message.
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.Pp
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.Nm
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scripts are akin to a subset of
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.Xr sed 1
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scripts, but optimized for modifying mail.
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Note that
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.Nm
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unfolds and normalizes the mail headers, so they may need to be
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passed through
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.Xr mmime 7
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to ensure RFC 5322 conformance.
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The mail body is copied as-is.
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.Pp
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.Nm
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supports the following commands.
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The separators
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.Em after
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the command letter may be subsituted with an arbitrary symbol, just as in
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.Xr sed 1 .
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Multiple commands can be separated by
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.Sq Cm ";" .
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.Bl -tag -width Ds
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.It Cm "/" Ns Ar header Ns Cm "/" Ns Ic a Ns Cm "/" Ns Ar value Ns Cm "/"
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If the header
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.Sq Ar header Ns Cm ":"
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is not set in the message, add it with given
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.Ar value .
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.It Cm "/" Ns Ar headers Ns Cm "/" Ns Ic c Ns Cm "/" Ns Ar value Ns Cm "/"
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Change colon-separated headers matching the regular expression
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.Ar headers ,
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with implicit anchoring to the header name,
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to the value given in
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.Ar value .
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.It Cm "/" Ns Ar headers Ns Cm "/" Ns Ic d
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Delete colon-separated headers matching the regular expression
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.Ar headers ,
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with implicit anchoring to the header name.
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Use explicit
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.Sq Li ".*"
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to match arbitrary strings at the beginning or end of the headers.
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.Pp
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For example,
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.Sq Li "/x-.*/d"
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will delete all headers starting with
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.Sq Li "X-"
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(always case insensitive),
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and
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.Sq Li "/from:to:cc/d"
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will delete the headers
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.Sq Li "From:" ,
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.Sq Li "To:" ,
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and
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.Sq Li "Cc:" .
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.It Oo Cm "/" Ns Ar headers Ns Cm "/" Oc Ns Ic s Ns Cm "/" Ns Ar regex Ns Cm "/" Ns Ar replacement Ns Cm "/" Ns Op Ar flags
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Substitute matches of the POSIX Basic Regular Expression
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.Ar regex
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in headers matching the POSIX Basic Regular Expression
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.Ar headers ,
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with implicit anchoring to the header name
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(or all headers, if omitted),
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with the string
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.Ar replacement ,
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expanding
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.Sq Li "&"
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to the matched string,
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and
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.Sq Li "\\" Ns Ar N
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to the
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.Ar N Ns
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th
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sub-expression,
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where
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.Ar N
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is between 1 and 9.
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.Pp
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By default, only the first match is replaced, unless
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.Ar flags
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contains the letter
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.Sq Cm g .
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.Pp
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By default,
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.Ar regex
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is matched case sensitively, unless
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.Ar flags
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contains the letter
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.Sq Cm i .
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.El
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.Sh EXIT STATUS
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.Ex -std
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.Sh SEE ALSO
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.Xr sed 1 ,
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.Xr mmsg 7 ,
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.Xr regex 7
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.Sh AUTHORS
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.An Christian Neukirchen Aq Mt chneukirchen@gmail.com
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.Sh LICENSE
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.Nm
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is in the public domain.
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.Pp
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To the extent possible under law,
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the creator of this work
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has waived all copyright and related or
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neighboring rights to this work.
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.Pp
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.Lk http://creativecommons.org/publicdomain/zero/1.0/
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