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Homework 2 Fun with grep and find
UNIX System Programming Homework 2
Fun with grep and find. Store your answers in a textfile
1. Write a grep command that will match all words in a file that have at least one 'a'. 2. Write a grep command that will match all words in a file that have exactly one 'a'. 3. Write a single command line using only grep (perhaps multiple times) that will match all words in a file containing at least one occurrence of the vowels 'a', 'e', 'i', 'o', and 'u', in any order. E.g., unquestionable. 4. Write a single command line using only grep (perhaps multiple times) that will find all the words in a file containing at least one occurrence of the vowels 'a', 'e', 'i', 'o', and 'u', appearing in that order. E.g., unfacetious. 5. Write a single command line using only grep (perhaps multiple times) that will find all the words in a file containing exactly one occurrence of the vowels 'a', 'e', 'i', 'o', and 'u', in any order. E.g., unsportsmanlike. 6. Write a single command line using only grep (perhaps multiple times) that will find all the words in a file containing exactly one occurrence of the vowels 'a', 'e', 'i', 'o', and 'u', in that order. E.g., facetious. 7. Write a find command that will list all the files in your current directory (and its subdirectories) with the '.o' extension. 8. Write a find command that will list all the files in your current directory (and its subdirectories) that are larger than 50KB in size. 9. Write a find command that will list all the files in your home directory that are larger than 50 KB with the '.o' extension 10.Write a find command that will delete all the '.o' files that are larger than 50 KB in your home directory (and its subdirectories) that were accessed last more than 7 days ago. Notes: 1. You should assume that the grep commands are used on a file with one word on each line all in lowercase. You can test your commands using /usr/share/dict/words on a Linux box (after you test it on a much smaller file). 2. You can use dd if=/dev/urandom of=<filename.o bs=1k count=<numBlocks to create random '.o' files. You can modify access times with the touch command (see man page on how to change times other than modification time).
Fun with grep and find. Store your answers in a textfile
1. Write a grep command that will match all words in a file that have at least one 'a'. 2. Write a grep command that will match all words in a file that have exactly one 'a'. 3. Write a single command line using only grep (perhaps multiple times) that will match all words in a file containing at least one occurrence of the vowels 'a', 'e', 'i', 'o', and 'u', in any order. E.g., unquestionable. 4. Write a single command line using only grep (perhaps multiple times) that will find all the words in a file containing at least one occurrence of the vowels 'a', 'e', 'i', 'o', and 'u', appearing in that order. E.g., unfacetious. 5. Write a single command line using only grep (perhaps multiple times) that will find all the words in a file containing exactly one occurrence of the vowels 'a', 'e', 'i', 'o', and 'u', in any order. E.g., unsportsmanlike. 6. Write a single command line using only grep (perhaps multiple times) that will find all the words in a file containing exactly one occurrence of the vowels 'a', 'e', 'i', 'o', and 'u', in that order. E.g., facetious. 7. Write a find command that will list all the files in your current directory (and its subdirectories) with the '.o' extension. 8. Write a find command that will list all the files in your current directory (and its subdirectories) that are larger than 50KB in size. 9. Write a find command that will list all the files in your home directory that are larger than 50 KB with the '.o' extension 10.Write a find command that will delete all the '.o' files that are larger than 50 KB in your home directory (and its subdirectories) that were accessed last more than 7 days ago. Notes: 1. You should assume that the grep commands are used on a file with one word on each line all in lowercase. You can test your commands using /usr/share/dict/words on a Linux box (after you test it on a much smaller file). 2. You can use dd if=/dev/urandom of=<filename.o bs=1k count=<numBlocks to create random '.o' files. You can modify access times with the touch command (see man page on how to change times other than modification time).
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