Mercurial > python-cmd2

annotate README.txt @ 195:455ebe415d5e 0.4.6

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author catherine@dellzilla
date Wed, 25 Feb 2009 14:00:43 -0500
parents 403e1c3ffc4a
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1 ----
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2 cmd2
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3 ----
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4
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5 :Author: Catherine Devlin, http://catherinedevlin.blogspot.com
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6
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7 `cmd2` is a tool for writing command-line interactive applications. It is based on the Python Standard Library's `cmd` module, and can be used anyplace `cmd` is used simply by importing `cmd2` instead.
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8
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9 `cmd2` provides the following features, in addition to those already existing in `cmd`:
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10
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11 - Searchable command history
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12 - Load commands from file, save to file, edit commands in file
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13 - Multi-line commands
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14 - Case-insensitive commands
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15 - Special-character shortcut commands (beyond cmd's `@` and `!`)
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16 - Settable environment parameters
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17 - Parsing commands with flags
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18 - Redirection to file with `>`, `>>`; input from file with `<`
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19 - Bare '>', '>>' with no filename send output to paste buffer
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20 - Pipe output to shell commands with `|`
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21 - Simple transcript-based application testing
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22
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23 Instructions for implementing each feature follow.
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24
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25 - Searchable command history
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26
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27 All commands will automatically be tracked in the session's history, unless the command is listed in Cmd's excludeFromHistory attribute.
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28 The history is accessed through the `history`, `list`, and `run` commands
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29 (and their abbreviations: `hi`, `li`, `l`, `r`).
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30 If you wish to exclude some of your custom commands from the history, append their names
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31 to the list at Cmd.ExcludeFromHistory.
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32
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33 - Load commands from file, save to file, edit commands in file
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34
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35 Type `help load`, `help save`, `help edit` for details.
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36
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37 - Multi-line commands
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38
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39 Any command accepts multi-line input when its name is listed in `Cmd.multilineCommands`.
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40 The program will keep expecting input until a line ends with any of the characters
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41 in `Cmd.terminators` . The default terminators are `;` and `/n` (empty newline).
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42
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43 - Case-insensitive commands
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44
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45 All commands are case-insensitive, unless `Cmd.caseInsensitive` is set to `False`.
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46
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47 - Special-character shortcut commands (beyond cmd's "@" and "!")
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48
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49 To create a single-character shortcut for a command, update `Cmd.shortcuts`.
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50
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51 - Settable environment parameters
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52
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53 To allow a user to change an environment parameter during program execution,
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54 append the parameter's name to `Cmd.settable`.
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55
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56 - Parsing commands with `optparse` options (flags)
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57
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58 ::
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59
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60 @options([make_option('-m', '--myoption', action="store_true", help="all about my option")])
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61 def do_myfunc(self, arg, opts):
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62 if opts.myoption:
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63 ...
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64
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65 See Python standard library's `optparse` documentation: http://docs.python.org/lib/optparse-defining-options.html
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66
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67 cmd2 can be installed with `easy_install cmd2`
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68
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69 Cheese Shop page: http://pypi.python.org/pypi/cmd2
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70
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71 Example cmd2 application (example/example.py) ::
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72
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73 '''A sample application for cmd2.'''
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74
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75 from cmd2 import Cmd, make_option, options, Cmd2TestCase
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76 import unittest, optparse, sys
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77
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78 class CmdLineApp(Cmd):
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79 multilineCommands = ['orate']
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80 Cmd.shortcuts.update({'&': 'speak'})
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81 maxrepeats = 3
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82 Cmd.settable.append('maxrepeats')
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83
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84 @options([make_option('-p', '--piglatin', action="store_true", help="atinLay"),
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85 make_option('-s', '--shout', action="store_true", help="N00B EMULATION MODE"),
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86 make_option('-r', '--repeat', type="int", help="output [n] times")
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87 ])
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88 def do_speak(self, arg, opts=None):
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89 """Repeats what you tell me to."""
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90 arg = ''.join(arg)
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91 if opts.piglatin:
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92 arg = '%s%say' % (arg[1:], arg[0])
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93 if opts.shout:
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94 arg = arg.upper()
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95 repetitions = opts.repeat or 1
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96 for i in range(min(repetitions, self.maxrepeats)):
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97 self.stdout.write(arg)
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98 self.stdout.write('\n')
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99 # self.stdout.write is better than "print", because Cmd can be
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100 # initialized with a non-standard output destination
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101
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102 do_say = do_speak # now "say" is a synonym for "speak"
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103 do_orate = do_speak # another synonym, but this one takes multi-line input
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105 class TestMyAppCase(Cmd2TestCase):
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106 CmdApp = CmdLineApp
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107 transcriptFileName = 'exampleSession.txt'
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108
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109 parser = optparse.OptionParser()
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110 parser.add_option('-t', '--test', dest='unittests', action='store_true', default=False, help='Run unit test suite')
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111 (callopts, callargs) = parser.parse_args()
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112 if callopts.unittests:
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113 sys.argv = [sys.argv[0]] # the --test argument upsets unittest.main()
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114 unittest.main()
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115 else:
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116 app = CmdLineApp()
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117 app.cmdloop()
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118
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119 The following is a sample session running example.py.
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120 Thanks to `TestMyAppCase(Cmd2TestCase)`, it also serves as a test
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121 suite for example.py when saved as `exampleSession.txt`.
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122 Running `python example.py -t` will run all the commands in the
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123 transcript against `example.py`, verifying that the output produced
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124 matches the transcript.
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125
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126 example/exampleSession.txt::
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127
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128 (Cmd) help
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129
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130 Documented commands (type help <topic>):
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131 ========================================
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132 _load edit history li load pause run say shell show
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133 ed hi l list orate r save set shortcuts speak
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134
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135 Undocumented commands:
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136 ======================
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137 EOF cmdenvironment eof exit help q quit
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138
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139 (Cmd) help say
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140 Repeats what you tell me to.
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141 Usage: speak [options] arg
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142
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143 Options:
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144 -h, --help show this help message and exit
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145 -p, --piglatin atinLay
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146 -s, --shout N00B EMULATION MODE
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147 -r REPEAT, --repeat=REPEAT
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148 output [n] times
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149
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150 (Cmd) say goodnight, Gracie
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151 goodnight, Gracie
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152 (Cmd) say -ps --repeat=5 goodnight, Gracie
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153 OODNIGHT, GRACIEGAY
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154 OODNIGHT, GRACIEGAY
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155 OODNIGHT, GRACIEGAY
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156 (Cmd) set
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157 prompt: (Cmd)
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158 editor: gedit
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159 echo: False
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160 maxrepeats: 3
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161 (Cmd) set maxrepeats 5
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162 maxrepeats - was: 3
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163 now: 5
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164 (Cmd) say -ps --repeat=5 goodnight, Gracie
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165 OODNIGHT, GRACIEGAY
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166 OODNIGHT, GRACIEGAY
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167 OODNIGHT, GRACIEGAY
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168 OODNIGHT, GRACIEGAY
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169 OODNIGHT, GRACIEGAY
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170 (Cmd) hi
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171 -------------------------[1]
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172 help
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173 -------------------------[2]
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174 help say
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175 -------------------------[3]
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176 say goodnight, Gracie
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177 -------------------------[4]
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178 say -ps --repeat=5 goodnight, Gracie
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179 -------------------------[5]
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180 set
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181 -------------------------[6]
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182 set maxrepeats 5
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183 -------------------------[7]
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184 say -ps --repeat=5 goodnight, Gracie
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185 (Cmd) run 4
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186 say -ps --repeat=5 goodnight, Gracie
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187 OODNIGHT, GRACIEGAY
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188 OODNIGHT, GRACIEGAY
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189 OODNIGHT, GRACIEGAY
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190 OODNIGHT, GRACIEGAY
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191 OODNIGHT, GRACIEGAY
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192 (Cmd) orate Four score and
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193 > seven releases ago
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194 > our BDFL
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195 > blah blah blah
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196 >
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197 >
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198 Four score and seven releases ago our BDFL blah blah blah
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199 (Cmd) & look, a shortcut!
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200 look, a shortcut!
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201 (Cmd) say put this in a file > myfile.txt
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202 (Cmd) say < myfile.txt
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203 put this in a file
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204 (Cmd) set prompt "---> "
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205 prompt - was: (Cmd)
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206 now: --->
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207 ---> say goodbye
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208 goodbye