| 1 | #!/bin/sh
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| 2 |
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| 3 | # Regular expression (regex) is also pattern searching through file
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| 4 | # names but also through text or any string.
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| 5 | #
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| 6 | # . matches any single character except newline.
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| 7 | # $ ls tests/ | grep 2. # if you want to see it tested
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| 8 | #
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| 9 | #
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| 10 | # ^ matches the start of a line
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| 11 | # $ grep ^"Long, long" file # same as below
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| 12 | # $ grep "^Long, long" file
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| 13 | #
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| 14 | #
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| 15 | # $ matches the end of a line
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| 16 | # $ grep end$ file
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| 17 | #
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| 18 | # [-] gives a range within the brackets, a-z A-Z 0-9 can be used
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| 19 | # $ ls 1[0-6]* # an easier way of completing the previous
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| 20 | # # exercise without globbing
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| 21 | #
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| 22 | # + matches one or more of the previous character
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| 23 | # $ ls tests/ | grep -E 'o+' # for regex expressions like this you
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| 24 | # # may have to have the -E option
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| 25 | #
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| 26 | # ? matches zero or more of the previous character
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| 27 | # $ ls tests/ | grep -E 'o+*' # not a helpful example
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| 28 | #
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| 29 | # You want to verify if someone has inputted a valid file from tests/
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| 30 | # Your job is to match the file to a file if the user either inputs a
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| 31 | # number associated with that file, or the name between the number and
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| 32 | # file extension. Meaning inputs with .sh should return an error.
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| 33 |
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| 34 | verify() {
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| 35 | # duplicate more or remove lines below if needed
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| 36 | ls tests/ | grep -E && exit 0
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| 37 | ls tests/ | grep -E && exit 0
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| 38 | }
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| 39 |
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| 40 | verify $1
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| 41 | exit 1
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