- About egrep : Print lines matching a pattern
- It comes from “grep-2.6.3” package.
Examples:
1. To Interpret PATTERN as an extended regular expression
| $ egrep –extended-regexp PATTERN $ egrep -E PATTERN |
2. To Interpret PATTERN as a list of fixed strings
| $ egrep -F PATTERN $ egrep –fixed-strings PATTERN |
3. To Interpret PATTERN as a basic regular expression
| $ egrep -G PATTERN $ egrep –basic-regexp PATTERN |
4. To Interpret PATTERN as a Perl regular expression
| $ egrep -P PATTERN $ egrep –perl-regexp PATTERN |
5. To Use PATTERN as the pattern
| $ egrep -e PATTERN $ egrep –regexp=PATTERN |
6. To Obtain patterns from FILE, one per line
| $ egrep -f FILE, –file=FILE |
7. To Ignore case distinctions in both the PATTERN and the input files.
| $ egrep -i PATTERN $ egrep –ignore-case PATTERN |
8. To Invert the sense of matching, to select non-matching lines
| $ egrep -v PATTERN $ egrep –invert-match PATTERN |
9. To Select only those lines containing matches that form whole words.
| $ egrep -w PATTERN $ egrep –word-regexp PATTERN |
10. To Select only those matches that exactly match the whole line.
| $ egrep -x PATTERN $ egrep –line-regexp PATTERN |
11. To ignore the case
| $ egrep -y PATTERN |
12. To Suppress normal output; instead print a count of matching lines
| $ egrep -c PATTERN $ egrep –count PATTERN |
13. To display in color
| $ egrep –color PATTERN |
14. To Suppress normal output; instead print the name of each input file, from out will not be expected
| $ egrep -L $ egrep –files-without-match |
15. To Suppress normal output; instead print the name of each input file from which output have been printed
| $ egrep -l $ egrep –files-with-matches |
16. To Quiet; do not write anything to standard output Exit immediately with zero status if any match is found
| $ egrep -q $ egrep –quiet $ egrep –silent |
17. To Stop reading a file after NUM matching lines
| $ egrep -m NUM $ egrep –max-count=NUM |
18. To Print only the matched (non-empty) parts of a matching line
| $ egrep -o PATTERN $ egrep –only-matching PATTERN |
19. To Suppress error messages about nonexistent or unreadable files.
| $ egrep -s PATTERN $ egrep –no-messages PATTERN |
20. To Print the 0-based byte offset within the input file before each line of output.
| $ egrep -b PATTERN $ egrep –byte-offset PATTERN |
21. To Print the file name for each match.
| $ egrep -H PATTERN $ egrep –with-filename PATTERN |
22. To Suppress the prefixing of file names on output
| $ egrep -h PATTERN $ egrep –no-filename PATTERN |
23. To Display input actually coming from standard input as input coming from file LABEL.
| $ egrep -cd PATTERN | egrep –label=mysearch -H PATTERN |
24. To Prefix each line of output with the 1-based line number within its input file.
| $ egrep -n PATTERN $ egrep –line-number PATTERN |
25. To Make sure that the first character of actual line content lies on a tab stop
| $ egrep -T PATTERN $ egrep –initial-tab PATTERN |
26. To Report Unix-style byte offsets
| $ egrep -u PATTERN $ egrep –unix-byte-offsets PATTERN |
27. To Output a zero byte instead of the character that normally follows a file name.
| $ egrep -Z PATTERN $ egrep –null PATTERN |
28. To Print NUM lines of trailing context after matching lines
$ egrep -A NUM PATTERN
$ egrep –after-context=NUM PATTERN
To Print NUM lines of leading context before matching lines
$ egrep -B NUM PATTERN
$ egrep –before-context=NUM PATTERN
To Print NUM lines of output context
$ egrep -C NUM PATTERN
$ egrep –context=NUM PATTERN
To Process a binary file as if it were text
$ egrep -a PATTERN /tmp/bin
$ egrep -text PATTERN /tmp/bin
To assume that the file is of type TYPE.
$ egrep –binary-files=TYPE PATTERN
To If an input file is a device, FIFO or socket, use ACTION to process it
$ egrep -D ACTION PATTERN
$ egrep –devices=ACTION PATTERN
To If an input file is a directory, use ACTION to process it
$ egrep -d ACTION PATTERN
$ egrep –directories=ACTION PATTERN
To Skip files whose base name matches GLOB
$ egrep –exclude=GLOB PATTERN
To Skip files whose base name matches any of the file-name globs read from FILE
$ egrep –exclude-from=FILE PATTERN
To Exclude directories matching the pattern DIR from recursive searches
$ egrep –exclude-dir=DIR PATTERN
To Process a binary file as if it did not contain matching data
$ egrep -I PATTERN
To Search only files whose base name matches GLOB
$ egrep –include=GLOB PATTERN
To Read all files under each directory, recursively
$ egrep -r PATTERN
$ egrep -R PATTERN
To Use line buffering on output
$ egrep –line-buffered PATTERN
To If possible, use the mmap system call to read input, instead of the default read
$ egrep –mmap PATTERN
To Treat the file(s) as binary
$ egrep -U /tmp/file PATTERN
$ egrep –binary /tmp/file PATTERN
To Treat the input as a set of lines
$ egrep -z PATTERN
$ egrep –null-data PATTERN
To display the help
$ egrep -h
To print the version number of the grep
$ egrep -V
