annotate doc/jp/shell.rst @ 3153:2c7b42f53e9a

core (xmpp): avoid starting several clients at the same time: a check is done to avoid running startConnection several times at once, which would lead to the creation of several SatXMPPEntity instances at the same time, resulting in many issues. If startConnection is called while a previous one is not finished yet, a CancelError is now raised.
author Goffi <goffi@goffi.org>
date Mon, 03 Feb 2020 13:46:24 +0100
parents 9464ad3b2ece
children
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1 ========================
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2 shell: use SàT with REPL
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3 ========================
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4
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5 ``shell`` launch a read–eval–print loop (REPL) with some helpers to launch jp commands.
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6 This is useful if you are willing to a session when you'll use several commands in a row
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7 (for e.g. to inspect something on a PubSub service).
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8
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9 start the shell
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10 ===============
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11
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12 To start the shell, you just have to enter ``jp shell``. You can eventually specify a
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13 profile to use an other one than the default one by entering ``jp shell -p
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14 <some_profile>``.
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16
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17 .. _jp-shell_use:
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18
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19 use the shell
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20 =============
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21
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22 Once in the shell, you can launch a command by entering it as usual (without having to
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23 specify ``jp``). For instance to get last 2 blog posts from your personal blog, you just
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24 have to enter::
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25
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26 > blog get -m 2
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27
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28 There are 2 kinds of commands in the shell:
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29
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30 - **shell commands** which are command to manipulate the shell itself
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31 - **jp commands** which are the classic commands that you use with jp
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32
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33 The most important thing to remember is that you can use ``?`` (or ``help`` which is
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34 equivalent) to get the list of commands (shell + jp), and ``?<command>`` (or ``help
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35 <command>``) to get information on a shell command. For jp commands, you can use the usual
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36 ``--help`` argument.
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37
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38 You may move in the commands hierarchy using ``cmd`` which can be seen as something
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39 roughly equivalent to ``cd`` for the filesystem. for instance if you know you'll work with
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40 XMPP blogs, you can enter::
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41
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42 > cmd blog
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43
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44 Then you'll be in the blog hierarchy, you can check that by entering ``?``. From there you
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45 can use blog commands directly, like in this example to retrieve last 2 blog posts::
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46
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47 blog> get -m 2
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48
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49 You can even go further, e.g. if you know that you'll do several ``get`` command (in this
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50 can you'll only have to specify the arguments of ``get``)::
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51
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52 blob> cmd get
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53 blog/get> -m 2
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54
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55 You can use ``/`` with ``cmd``, including as first character to indicate that you want to
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56 start from root::
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57
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58 blog/get> cmd /pubsub
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59 pubsub> cmd node/info
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60
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61 Similarly, you can use ``..`` to move to parent command::
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62
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63 pubsub/node/info> cmd ..
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64
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65 One of the interesting feature of shell is that you can fix an argument, i.e. indicate
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66 the value to use in the next commands. For instance if you're willing to work on a
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67 specific node, you can set its value with ``use``::
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68
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69 blog> use node some_interesting_node
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70
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71 Then you won't have to specify it anymore for each command. The name of the argument to
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72 fix must be the long form. To check which arguments are fixed, just enter ``use`` without
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73 argument. If an argument is fixed but not used in a command, it will be ignored.
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74
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75 To clear a fixed argument, you have the ``use_clear`` command. To clear the ``node``
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76 argument set above, just enter::
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77
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78 blog> use_clear node
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79
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80 Without argument, all fixed arguments will be cleared.
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81
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82
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83 Shell commands
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84 ==============
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85
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86 Below is a description of shell commands.
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87
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88
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89 cmd
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90 ---
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91
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92 Move in the command hierarchy, this avoid to type again a command if you know you'll use
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93 it several times. See jp-shell_use_ for explanation and examples
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94
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95 do
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96 --
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97
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98 Launch a jp command. By default the command is launched if you enter directly its name and
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99 arguments, but if a command or argument conflict with a shell command, the shell command
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100 will be launched instead. The ``do`` command avoid such a situation by always launching a
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101 jp command::
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102
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103 > do blog get -m 2
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104
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105 exit
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106 ----
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107
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108 Quit the shell (alias of ``quit``).
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109
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110 help (alias ``?``)
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111 ------------------
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112
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113 Give information on available commands or on a specific command, see jp-shell_use_ for
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114 more explanations.
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115
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116 examples
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117 ^^^^^^^^
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118
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119 Get general help::
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120
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121 > ?
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122
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123 Get help on ``do`` command::
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124
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125 > ?do
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126
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127 quit
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128 ----
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129
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130 Quit the shell
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131
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132 shell (alias ``!``)
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133 -------------------
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134
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135 Launch an external command.
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136
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137 example
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138 ^^^^^^^
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139
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140 Print a calendar with ``cal``::
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141
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142 > !cal
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143
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144 use
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145 ---
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146
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147 Fix the value of an argument, which will then be set for all following commands, see
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148 jp-shell_use_ for more explanations.
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149
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150 Without argument, show all fixed arguments
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151
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152 examples
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153 ^^^^^^^^
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154
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155 Fix the PubSub node (the long name of the argument is used, so it will go to ``--node``)::
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156
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157 pubsub> use node some_intersting_node
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158
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159 Show all fixed arguments::
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160
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161 > use
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162
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163 use_clear
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164 ---------
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165
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166 Unfix the value of an argument (i.e. use the normal default value). Without argument,
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167 it unfixes all arguments.
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168
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169 examples
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170 ^^^^^^^^
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171 Clear the node::
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172
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173 pubsub> use_clear node
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174
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175 Clear all arguments::
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176
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177 > use_clear
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178
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179 verbose
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180 -------
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181
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182 Without argument, show if verbose mode is activated. With an argument evaluating to a
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183 boolean, activate or deactivate this mode.
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184
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185 In verbose mode, the fixed arguments and the command launched are printed before launching
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186 a jp command.
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187
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188 examples
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189 ^^^^^^^^
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190
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191 Show if verbose mode is activated::
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192
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193 > verbose
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194
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195 Activate verbose mode::
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196
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197 > verbose on
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198
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199 version
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200 -------
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201
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202 Print current version of jp/Salut à Toi.
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203
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204 whoami
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205 ------
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206
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207 Show the name of the connected profile (the one set with ``--profile`` when launching the
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208 shell). This profile will be used as default profile.