Term
| 3.2 - Name the standard channels and their Linux names? |
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Definition
| Standard input = stdin(channel 0), standard output = stdout(channel 1), standard error output = stderr(channel 2) |
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Term
| 3.2 - How can you set the standard error output? |
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Definition
By using the "2>" operator
Example: find /usr games 2> text-error |
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Term
| 3.2 - How do you redirect the standard output (channel 1) to a file? |
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Definition
By using the ">" operator
Example: top > result.txt |
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Term
| 3.2 - How do you append information to a file? |
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Definition
Use the ">>" operator.
Example: echo "This is my additional information" >> my-file.txt |
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Term
| 3.2 - How do you combine the redirection of standard output and input? |
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Definition
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Term
| 3.2 - What does the "grep -i" switch do? |
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Definition
| Makes the search case insensitive |
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Term
| 3.2 - What does the "grep -r" switch do? |
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Definition
| Makes the search recursive (it searches into all files within the given directory and its subdirectory) |
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Term
| 3.2 - What does the "grep -c" switch do? |
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Definition
| Makes the search counts the number of matches |
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Term
| 3.2 - What does the "grep -v" switch do? |
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Definition
| Makes the search invert the match, to print lines that do not match the search term |
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Term
| 3.2 - What does the "grep -E" switch do? |
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Definition
| Turns on extended regular expressions (needed by some of the more advanced meta-characters like "|", "+", "?") |
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Term
| 3.2 - What does the regex character "[^abcABC]" match (quotations not included) |
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Definition
| Match any one character except the ones in the brackets |
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Term
| 3.2 - What does the regex character "[a-z]" match (quotations not included) |
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Definition
| Match any character in the range |
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Term
| 3.2 - What does the regex character "[^a-z]" match (quotations not included) |
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Definition
| Match any character except the ones in the range |
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Term
| 3.2 - What does the regex character "^" do? (quotations not included) |
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Definition
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Term
| 3.2 - What does the regex "$" character do? |
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Definition
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Term
| 3.2 - Where should the "^" regex meta-character need to be placed? |
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Definition
Before the expression
Example: grep "^a" and not grep "a^"
This is the beginning of a line so it is placed before the expression |
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Term
| 3.2 - Where does the "$" regex meta-character need to be placed? |
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Definition
After the expression
Example: grep "a$" and not grep "$a"
This is the end of a line so it is placed at the end of the expression |
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Term
| 3.2 - What is the "grep -i" switch? |
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Definition
| Makes the search case insensitive |
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Term
| 3.2 - What is the "grep -r" switch? |
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Definition
| Make the search recursive (searches all files within the given directory) |
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Term
| 3.2 - What is the "grep -c" switch? |
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Definition
| Counts the numbers of matches |
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Term
| 3.2 - What is the "grep -v" switch? |
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Definition
| Inverts the match, to print lines that do not match the search |
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Term
| 3.2 - What is the "grep -E" switch? |
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Definition
| Turns on extended regular expressions |
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Term
| 3.2 - What does the "." regular expression do? |
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Definition
| Match any single character |
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Term
| 3.2 - What does the "[abcABC]" regular expression do? |
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Definition
| Match any one character within the brackets |
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Term
| 3.2 - What does the "[^abcABC]" regular expression do? |
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Definition
| Match any one characters EXCEPT the ones in the bracket |
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Term
| 3.2 - What does the "[a-z]" regular expression do? |
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Definition
| Match any character in the range within the brackets |
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Term
| 3.2 - What does the "[^a-e]" regular expression do? |
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Definition
| Match an character except the ones in the range within the brackets |
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Term
| 3.2 - What does the "sun|moon" regular expression do? |
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Definition
| Match either of the listed strings |
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Term
| 3.2 - What does the "$" regular expression do? |
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Definition
| Match any characters at the end of the line |
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Term
| 3.2 - What does the "^" regular expression do? |
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Definition
| Match any character at the beginning of the line |
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