Linux and Unix fgrep command
fgrep searches for fixed-character strings in a file or files. "Fixed-character" means the string is interpreted literally — metacharacters do not exist, and therefore regular expressions cannot be used.
fgrep is useful when you need to search for strings which contain lots of regular expression metacharacters, such as "$", "^", etc. By specifying that your search string contains fixed characters, you don't need to escape each of them with a backslash.
If your string contains newlines, each line will be considered an individual fixed-character string to be matched in the search.
Running fgrep is the same as running grep with the -F option.
fgrep [-b] [-c] [-h] [-i] [-l] [-n] [-s] [-v] [-x] [ -e pattern_list] [-f pattern-file] [pattern] [file]
|-b||Precede each line by the block number on which it was found. This can be useful in locating block numbers by context (first block is 0).|
|-c||Print only a count of the lines that contain the pattern.|
|-h||Suppress printing of files when searching multiple files.|
|-i||Ignore upper/lower case distinction during comparisons.|
|-l||Print the names of files with matching lines once, separated by new-lines. Does not repeat the names of files when the pattern is found more than once.|
|-n||Precede each line by its line number in the file (first line is 1).|
|-s||Work silently, that is, display nothing except error messages. This is useful for checking the error status.|
|-v||Print all lines except those that contain the pattern.|
|-x||Print only lines matched entirely.|
|-e pattern_list||Search for a string in pattern-list (useful when the string begins with a "-").|
|-f pattern-file||Take the list of patterns from pattern-file.|
|pattern||Specify a pattern to be used during the search for input.|
|file||A path name of a file to be searched for the patterns. If no file operands are specified, the standard input will be used.|
fgrep "support" myfile.txt
Search for "support" in the file myfile.txt.
ed — A simple text editor.
egrep — Filter text which matches an extended regular expression.
grep — Filter text which matches a regular expression.
sed — A utility for filtering and transforming text.
sh — The Bourne shell command interpreter.