By Y. Nishinuma, J. A. Mariani, M. J. Srewart, R. Espresser
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Extra info for UNIX: First Contact
In the rm command. $ rm musette? $ Is kitty useful $ So, we have removed two files at a stroke. What is more, a single ? can designate single letter files, if they exist. The next command line only relates to two-character file names, which do not exist here. UNIX - 18 First contact $ rm ?? rm: ?? nonexistent $ = system message Note in this reply that since the ?? does not refer to any file, the shell has interpreted these symbols as a literal string. This is a general rule in the expansion of generic metacharacters.
The numbers of the first and last line are given, followed by d instead of p. 3,$d® The command line destroying the third to the last line has been 37 Text editor cancelled at the last minute with the command that removes the current line. Before saving this file, let us look at its present contents. :l,$p Earth has not anything to show more fair: Dull would he be of soul who could pass by A sight so touching in its majesty: This City now doth, like a garment, wear The beauty of the morning; silent, bare.
Think $ rm * about it! For those who wish to try rm *, but not too painfully, we suggest using the -i (interactive) option, which lists all the files, one by one in alphabetical order. You reply with y or n depending on your choice. This option is useful for destroying files whose name contains invisible or unprintable characters owing to a keying error. $ rm -i kitty: * = reply as you wish In contrast, the question mark? is less disastrous; it represents any character in the file name. To illustrate this, we shall create two files musette 1 and musette2.
UNIX: First Contact by Y. Nishinuma, J. A. Mariani, M. J. Srewart, R. Espresser