Term
| A set of rules that can be used to specify one or more items in a single character string (sequence of characters). |
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Term
| Which regular expression operator means alternationA set of rules that can be used to specify one or more items in a single character string (sequence of characters). |
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Definition
| | - x|y|z meaning x,y, or z |
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Term
| Which regular expression operator means any character |
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Definition
| . (dot) - .com means Acom, acom |
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Term
| Which regular expression operator means beginning of line? |
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Definition
| ^ caret - ^x means a line starting with x |
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Term
| Which regular expression operator means concatenation |
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Term
| Which regular expression operator means end of line |
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Definition
| $ - x& means a line ending with an x |
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Term
| Which regular expression operator means escape sequence, which cancels the special meaning of the metacharacter following it? |
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Definition
| \ backslash - \* meaning * |
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Term
| Which regular expression operator means delimiter: marks the beginning or end of a regular expression |
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Definition
| / forward slash - /L.e/ means Love, Live,etc |
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Term
| Which regular expression operator means grouping |
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Definition
| () or \(\) - (xy)+ means xy, xyxy, xyxyxy |
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Term
| Which regular expression operator means optional |
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Term
| Which regular expression operator means repetition (0 or more times) |
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Definition
| * - xy* means x, xy, xyy, xyyy |
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Term
| Which regular expression operator means repetition (1 or more times) |
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Definition
| + - xy+ means xy, xyy, xyyy |
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Term
| Which regular expression operator means Set: Matches any character enclosed in brackets. |
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Definition
| [] - /[Hh]ello/ means Hello, hello |
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Term
| Which regular expression operator means Set: Matches any character not enclosed in brackets. |
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Definition
| [^] /[^A-KM-Z]ove/ means Love |
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Term
| Which regular expression operator means do forward search for a single-stand-alone digit character in the current file; digits that are part of strings are not identified |
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| Which regular expression operator means Do backward search for words or strings in words that end with .c followed by single digit between 1 and 7 |
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Term
| Which regular expression operator means search the whole file and substitue colon and the end of the line with a period |
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Definition
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Term
| Which regular expression operator means from the current line to the end of file, substitute the words Hello and hello starting a line with the word Greetings |
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Definition
| :.,$s/^[Hh]ello/Greetings/ |
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Term
| Which regular expression operator means eliminate one or more spaces at the beginning of all the lines in the file. |
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Term
| Reduction in the size of a file is known as __ |
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Term
| Which command is the GNU tool for compressing files |
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Term
| Which command is the GNU tool for uncompressing files |
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Term
| Means ordering a set of items according to come criteria |
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Term
| Unix utility to sort items in text (ASCII files) |
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Term
| Sort the students file in revers order by using the phone number as sort key and ignoring leading blanks. |
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Definition
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Term
| Sort the students file with the last name as the primary key and the phone number as the secondary key |
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Definition
| sort +1 -2 +3 -b students, +1 -2 means that the key starts and ends before the e-mail address field (-2) starts |
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Term
| Search the directories in directory-list to locate files that meet the 'criteria' described by the expression (the second argument) |
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Definition
| find directory-list expression |
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Term
| Search for files with inode number 'N' |
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Definition
find -inum N directory-list
example: find /usr . -inum 258072 -print |
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Term
| Search for files that are specified by the 'pattern' |
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Definition
find -name pattern
example: find ~ -name Pakistan.gif -print |
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Term
| Command used to locate binaries, source codes, and manual pages for hte command in file-list - a space-seperated list of command names |
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Definition
whereis [options] file-list
examples: whereis ftp, whereis -b cat
whereis find compress tar |
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Term
| The command used to determine the location (absolute pathname) of the version that is executed by the shell you are using when you type the command |
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Definition
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Term
| Search the files in 'file-list' for the given pattern, or expression; if no file-list, take input from standard input |
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Definition
| grep, egrep, fgrep [options] pattern file-list |
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Term
| display the line the students file that contain string 'sarwar' |
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Definition
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Term
| Display the lines in the students file with line number that contain the string 'sanwar' |
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Term
| Search for the string 'include' in all the files in the present working directory that end with .c |
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Term
| Display the names of files that contain the word Portland in the ~/States directory |
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Definition
| egrep -l Portland ~/States |
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Term
| Display the lines in the students file that start with letters A through H. |
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Definition
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Term
| Display the lines in the students file that contain at least eight consecutive lowercase letters |
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Definition
| egrep '[a-z]\{8\}' students |
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Term
| Display the lines in the students file that contain a word ending starting with the word(string) Ke. |
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Definition
| egrep "\note: \< is used to indicate the start of a word. |
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Term
| Display the lines in the students file that contain words that end with net. |
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Definition
egrep 'net\>' students
note \> is used to indicate end of a word |
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Term
| Display the lines that contain either Kimberly or Nabeel. |
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Definition
| egrep -n "Kimberly|Nabeel" students |
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Term
| Display the lines in the students file that starts with letter J. |
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Term
| Command to cut out fields of a table in a file |
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Definition
cut -flist [-dchar] [-s] file-list
-f list cut fields specified in the list
-d char Use 'char' instead of as field seperator
-s Do not output lines that do not have the delimiter character |
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Term
| Display only the first and last names in the students file |
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Term
| Display the first three fields in the students file |
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Term
| Command that concatenates files in file-list horizontally. Hence, this command can be used to paste tables in a column. |
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Definition
paste [options[ file-list
-d list Use 'list' characters as line seprators; is the default character |
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Term
| Use student_address and student_records tables to generate and display a table that has student names, majors and home phone numbers |
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Definition
| paste student_records student addresses | cust -f1-3,7 |
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Term
| When a file is encrypted it becomes: |
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Definition
| indecipherable even if access is granted to read it. |
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Term
| Command to encode source-file from binary to ASCII |
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Definition
| uuencode source-file decode-label |
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Term
| Command to decode encoded-file from ASCII to binary |
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Definition
| uudecode [option] encoded-file |
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Term
| Command to encrypt a file |
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Definition
>gpg --gen-key
>create passphrase
>gpg -e -r passphrase original_file
example: gpg -e -r 'Karina' smallFile |
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Term
| Command to decrypt an encrypted file |
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Definition
> gpg -d encrypted_file
>passphrase
example gpg -d smallfile.gpg |
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Term
| A process by which a file is converted to a form completely different from its original version |
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Definition
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