By Keith Bradnam, Ian Korf

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Extra info for UNIX and Perl to the Rescue!. A Field Guide for the Life Sciences

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Indd 49 11/5/2011 6:02:27 PM 50 Essential Unix Explanation We make a test file in the “Unix_and_Perl” directory and copy it to the “Temp” directory. We then remain in the same directory but make a copy of our test file and rename it in the process (from “test1” to “test2”). Because the act of copying could potentially overwrite an existing file, there is a -i command-line option which works in exactly the same way as the -i option for the mv and rm commands (remember, you can check the man page if you want to know more).

You can even press tab twice before typing anything at all. If you do this you will probably see a warning message like this: Display all 1712 possibilities? (y or n) This suggests that, on our computer, there are 1712 different Unix commands and programs that can be run. 10 autoheader automake automator autoreconf autoscan autoupdate Explanation The first part of this example shows that even when you have typed the name of an existing command (in this case ls), there may be other Unix commands that match the combination of letters that you have typed; in this case by pressing tab twice we see the six Unix commands that all start with “ls”.

If you do this you will probably see a warning message like this: Display all 1712 possibilities? (y or n) This suggests that, on our computer, there are 1712 different Unix commands and programs that can be run. 10 autoheader automake automator autoreconf autoscan autoupdate Explanation The first part of this example shows that even when you have typed the name of an existing command (in this case ls), there may be other Unix commands that match the combination of letters that you have typed; in this case by pressing tab twice we see the six Unix commands that all start with “ls”.

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