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1 .\" @(MHWARNING)
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2 .\" @(#)$Id$
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3 .SC SHOW 1
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4 .NA
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5 show \- show (list) messages
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6 .SY
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7 show
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8 \%[+folder] \%[msgs]
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9 \%[\-draft]
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10 \%[\-header] \%[\-noheader]
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11 \%[\-showproc\ program] \%[\-noshowproc]
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12 \%[switches\ for\ \fIshowproc\fR]
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13 \%[\-help]
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14 .DE
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15 \fIShow\fR lists each of the specified messages to the standard
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16 output (typically, the terminal).
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17 Typically, the messages are listed exactly
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18 as they are, with no reformatting.
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19 A program named by the \fIshowproc\fR profile component is
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20 invoked to do the listing, and any switches not recognized by
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21 \fIshow\fR are passed along to that program.
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22 The default program is known as \fImore\fR\0(1).
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23 To override the default and the \fIshowproc\fR profile component,
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24 use the `\-showproc\ program' switch.
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25 For example, `\-show\ pr' will cause the \fIpr\fR\0(1) program to list the
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26 messages.
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27 The \fIMH\fR command \fImhl\fR can be used as a \fIshowproc\fR
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28 to show messages in a more uniform format.
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29 Normally, this program is specified as the \fIshowproc\fR is the user's
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30 \&.mh\(ruprofile.
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31 See \fImhl\fR\0(1) for the details.
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32 If the `\-noshowproc' option is specified,
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33 `/bin/cat' is used instead of \fIshowproc\fR.
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34 @BEGIN: MIME
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35
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36 If you have messages with multi-media contents,
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37 the profile entry \fImhnproc\fR defines the name of a program to
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38 manipulate multi-media messages.
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39 (The \fImhn\fR\0(1) program,
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40 which is suitable for this purpose,
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41 is the default.)
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42 If the `\-noshowproc' option is NOT specified,
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43 and if one or more named messages has a multi-media content,
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44 then the program indicated by \fImhnproc\fR will be run instead of
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45 \fIshowproc\fR.
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46 The use of the \fImhnproc\fR can also be disabled if the
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47 environment variable \fBNOMHNPROC\fR is set.
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48 Note that the \fImhnproc\fR may be invoked even for textual contents,
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49 depending on the character set involved.
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50 The environment variable \fBMM_CHARSET\fP should be set to the terminal's
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51 character set to avoid gratuitous invocations of the \fImhnproc\fR.
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52 @END: MIME
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53
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54 The `\-header' switch tells \fIshow\fR to display a one\-line
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55 description of the message being shown.
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56 This description includes the folder and the message number.
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57
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58 If no `msgs' are specified, the current message is used.
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59 If more than one message is specified,
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60 \fImore\fR will prompt for a <RETURN> prior to listing each message.
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61 \fImore\fR will list each message, a page at a time.
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62 When the end of
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63 page is reached, \fImore\fR will ring the bell and wait for a <SPACE>
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64 or <RETURN>.
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65 If a <RETURN> is entered, \fImore\fR will print the next line,
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66 whereas <SPACE> will print the next screenful.
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67 To exit \fImore\fR, type \*(lqq\*(rq.
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68
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69 If the standard output is not a terminal, no queries are made,
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70 and each file is listed with a one\-line header and two lines of
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71 separation.
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72
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73 \*(lqshow \-draft\*(rq will list the file <mh\-dir>/draft if it
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74 exists.
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75
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76 If the profile entry \*(lqUnseen\-Sequence\*(rq is present and non\-empty,
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77 then \fIshow\fR will remove each of the messages shown from each
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78 sequence named by the profile entry.
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79 This is similar to the \*(lqPrevious\-Sequence\*(rq profile entry supported
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80 by all \fIMH\fR commands which take `msgs' or `msg' arguments.
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81 .Fi
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82 ^$HOME/\&.mh\(ruprofile~^The user profile
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83 .Pr
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84 ^Path:~^To determine the user's MH directory
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85 .Ps
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86 ^Current\-Folder:~^To find the default current folder
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87 .Ps
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88 ^Unseen\-Sequence:~^To name sequences denoting unseen messages
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89 .Ps
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90 ^showproc:~^Program to show messages
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91 @BEGIN: MIME
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92 .Ps
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93 ^mhnproc:~^Program to show messages with multi-media content
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94 @END: MIME
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95 .Sa
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96 mhl(1), more(1), next(1), pick(1), prev(1), scan(1)
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97 .De
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98 `+folder' defaults to the current folder
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99 .Ds
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100 `msgs' defaults to cur
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101 .Ds
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102 `\-header'
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103 .Co
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104 If a folder is given, it will become the current folder.
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105 The last message shown will become the current message.
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106 .Bu
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107 The `\-header' switch doesn't work when `msgs' expands to more than
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108 one message.
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109 If the \fIshowproc\fR is \fImhl\fR,
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110 then is problem can be circumvented by referencing
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111 the \*(lqmessagename\*(rq field in the \fImhl\fR format file.
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112
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113 \fIShow\fR updates the user's context before showing the message.
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114 Hence \fIshow\fR will mark messages as seen prior to the user
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115 actually seeing them.
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116 This is generally not a problem,
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117 unless the user relies on the \*(lqunseen\*(rq messages mechanism,
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118 and interrupts \fIshow\fR while it is showing \*(lqunseen\*(rq messages.
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119
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120 If \fIshowproc\fR is \fImhl\fR,
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121 then \fIshow\fR uses a built\-in \fImhl\fR:
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122 it does not actually run the \fImhl\fR program.
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123 Hence, if you define your own \fIshowproc\fR,
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124 don't call it \fImhl\fR since \fIshow\fR won't run it.
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125
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126 If \fImore\fR\0(1) is your showproc (the default),
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127 then avoid running \fIshow\fR in the background
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128 with only its standard output piped to another process, as in
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129
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130 .ti +.5i
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131 show | imprint &
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132
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133 Due to a bug in \fImore\fR,
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134 show will go into a \*(lqtty input\*(rq state.
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135 To avoid this problem,
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136 re\-direct \fIshow\fR's diagnostic output as well.
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137 For users of \fIcsh\fR:
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138
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139 .ti +.5i
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140 show |& imprint &
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141
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142 For users of \fIsh\fR:
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143
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144 .ti +.5i
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145 show 2>&1 | imprint &
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146 .En
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