1 | |
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2 | alias - provide an alias for a command |
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3 | _________________________________________________________________ |
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4 | |
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5 | alias [-h] [<name> [<string>]] |
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6 | |
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7 | The "alias" command, if given no arguments, will print the definition |
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8 | of all current aliases. |
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9 | |
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10 | Given a single argument, it will print the definition of that alias |
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11 | (if any). Given two arguments, the keyword "name" becomes an alias for |
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12 | the command string "string", replacing any other alias with the same |
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13 | name. |
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14 | |
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15 | Command options: |
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16 | |
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17 | -h |
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18 | Print the command usage. |
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19 | |
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20 | <name> |
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21 | Alias |
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22 | |
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23 | <string> |
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24 | Command string |
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25 | |
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26 | It is possible to create aliases that take arguments by using the |
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27 | history substitution mechanism. To protect the history substitution |
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28 | character `%' from immediate expansion, it must be preceded by a `\' |
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29 | when entering the alias. |
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30 | |
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31 | For example: |
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32 | |
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33 | vis> alias read read_\%:1 \%:2.\%:1 |
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34 | vis> read blif lion |
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35 | |
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36 | |
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37 | will create an alias `read', execute "read_blif lion.blif". |
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38 | |
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39 | And... |
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40 | |
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41 | vis> alias echo2 "echo Hi ; echo \%* !" |
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42 | vis> echo2 happy birthday |
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43 | |
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44 | |
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45 | will print: |
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46 | |
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47 | Hi |
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48 | happy birthday ! |
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49 | |
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50 | |
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51 | CAVEAT: Currently there is no check to see if there is a circular |
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52 | dependency in the alias definition. e.g. |
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53 | |
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54 | vis> alias foo "print_network_stats; print_network; foo" |
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55 | |
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56 | |
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57 | creates an alias which refers to itself. Executing the command "foo" |
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58 | will result an infinite loop during which the commands |
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59 | "print_network_stats" and "print_network" will be executed. |
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60 | _________________________________________________________________ |
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61 | |
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62 | Last updated on 20050519 10h16 |
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