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doc/Simtool-command-shell article written
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 20 Feb 2021 23:55:25 +0000
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1 Our fc-simtool and fc-uicc-tool operate as interactive shells. When you run
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2 either program, it selects the "card reader" device it will use and connects to
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3 the card via pcsc-lite facilities, and then it gives you an interactive command
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4 shell. The communication session with the card (including vital volatile state
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5 like PIN authentication and currently selected directory and EF) remains
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6 unbroken until you exit the shell, at which point our tools tell pcsc-lite to
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7 power down the card.
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8
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9 The actual useful commands available in fc-simtool and fc-uicc-tool are
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10 described in other documents; this document describes program invokation and
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11 the command shell itself.
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12
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13 Program invokation
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14 ==================
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15
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16 Both tools share the same command line structure:
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17
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18 fc-simtool [-p num] [batch-command]
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19 fc-uicc-tool [-p num] [batch-command]
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20
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21 If you run either tool without any options or arguments, it will select the
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22 first reader supported by pcsc-lite (reader number 0, same as if -p0 was
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23 specified), and if the card connection is successful, it will enter the
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24 interactive command shell. Use the -p num option to select a different reader
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25 number; to tell which reader number is which, use fc-pcsc-list to list all
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26 available readers.
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27
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28 Aside from the -p num option, any arguments given on the command line suppress
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29 the default interactive shell and select the tool's batch mode instead - the
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30 arguments specify the command to be executed. For example, the following
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31 invokation will read and display the inserted card's ICCID, and immediately
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32 exit:
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33
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34 fc-simtool iccid
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35
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36 This batch mode is particularly useful with the exec command described further
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37 in this document.
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38
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39 Command shell basic features
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40 ============================
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41
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42 The interactive command shell prompt is "simtool> " in fc-simtool and "uicc> "
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43 in fc-uicc-tool. In this interactive command shell mode commands are entered
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44 naturally, with white space separating the command keyword and any arguments.
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45 Arguments containing spaces need to be enclosed in double-quotes as in
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46 "quoted string"; our tools have two main instances where such complex arguments
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47 are used:
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48
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49 * Many of our commands, particularly low-level ones, take hexadecimal byte
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50 strings as arguments. In such hex byte strings each byte must be given as
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51 exactly two hex digits (no 0x and no single-digit bytes for small values),
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52 but spaces between bytes for human readability are optional. If these
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53 optional spaces are included, the whole argument needs to be included in
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54 double-quotes.
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55
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56 * Some of our commands take arguments that represent GSM 03.38 text strings,
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57 using our ASCII representation format for such strings that is defined in the
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58 SIM-data-formats document in the freecalypso-docs repository. If these
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59 arguments contain spaces, they need to be enclosed in double-quotes, and any
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60 embedded '"' characters need to be entered as \".
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61
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62 Output redirection
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63 ==================
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64
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65 Most of our information retrieval and dumping commands support output
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66 redirection at the tool-internal command shell level. For example, the
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67 following command will list the SIM Service Table (SST) on the terminal and
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68 redisplay the "simtool> " prompt:
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69
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70 simtool> sst
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71
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72 The following form of the same command will write the output to the named file
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73 and not send anything to the terminal:
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74
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75 simtool> sst > sst-list-file
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76
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77 If you try the '>' output redirection construct on a command that does not
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78 support it, you will get an error message.
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79
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80 Working with the local host file system
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81 =======================================
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82
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83 Because our tools provide a lot of commands for saving SIM data into host files
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84 (the above output redirection mechanism and some binary file writes) as well as
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85 reading data and command scripts from host files, having a sensible interaction
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86 with the local host file system is important. Users should have a convenient
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87 way to see what directory they are in, change their current directory, and
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88 invoke other local host commands like mkdir from inside their fc-simtool session
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89 - hence the following features are provided:
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90
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91 * Any command beginning with '!' is passed to the system shell /bin/sh - the
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92 primary use of this feature is to be able to run !pwd to see what directory
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93 you are in, and more rarely do other things like !mkdir mysimdata.
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94
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95 * The built-in cd command changes the current directory of the running
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96 fc-simtool process - because of the way UNIX works, cd is one command that
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97 cannot be usefully executed via the '!' shell invokation mechanism.
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98
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99 Command script facility
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100 =======================
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101
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102 Both fc-simtool and fc-uicc-tool implement an exec command:
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103
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104 exec script-file
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105
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106 This command opens the named file, reads it line by line, and executes each
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107 read line as a command. Whitespace-only lines are skipped, and any lines
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108 beginning with '#' are treated as comments. exec scripts can be nested. If
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109 the execution of any command encounters an error, all nested scripts are
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110 stopped: we implement the "stop on first error" policy.
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111
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112 If the given script file name contains any slashes, it is used as-is. If there
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113 are no slashes in the requested script file name, the file is sought first in
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114 the script installation directory /opt/freecalypso/sim-scripts, and if it is
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115 not found there, then in the current directory.
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116
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117 Data file sourcing
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118 ==================
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119
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120 All fc-simtool and fc-uicc-tool commands that read from ASCII-based data files
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121 named as arguments implement the same search logic as the exec command. This
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122 design allows complex SIM programming scripts to be installed in
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123 /opt/freecalypso/sim-scripts along with their data files, ready to be invoked
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124 as needed.