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Full Discussion: Grep multiple patterns(file) and replace whole line
Top Forums UNIX for Beginners Questions & Answers Grep multiple patterns(file) and replace whole line Post 303036206 by bakunin on Wednesday 19th of June 2019 05:28:00 AM
Old 06-19-2019
Quote:
Originally Posted by wxboo
How to replace them with either the new name or pattern name . The reason i want to replace them is that later i need to count how many patterns had been found. Maybe using
Code:
sort -u | wc

.
I stuck after grep all the matched, but do not know how many patterns had been found.
Code:
less input_file | grep -f pattern_file | ... | sort -u | wc

OK, first: if you want to change something, grep is not the right tool for it. You should use sed. grep is for finding things - but only finding, not changing them.

Second: before you start on a solution you should define your problem correctly. For instance, your sample input file has seven lines, your expected output has 5. Are the two missing lines left on purpose? If yes, say so. If not, how should they be handled? Maybe let unchanged?

So, let us first rephrase your task. I will make some assumptions here which might as well be wrong. Don't hesitate to correct them:

you have an input file containing certain text patterns and a pattern file which you want to apply to the input. When a pattern is matched you want to replace the whole line in the input with a certain marker, which is defined distinctly for each pattern found that way. Lines not matched by any pattern should be deleted from the result set. In a final step you want to count how many markers of each kind are found in the result set.

Is that correct?

I hope this helps.

bakunin
 

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LEARN ABOUT SUNOS

fgrep

fgrep(1)							   User Commands							  fgrep(1)

NAME

       fgrep - search a file for a fixed-character string

SYNOPSIS

       /usr/bin/fgrep [-bchilnsvx] [-e pattern_list] [-f pattern-file] [pattern] [file...]

       /usr/xpg4/bin/fgrep [-bchilnsvx] [-e pattern_list] [-f pattern-file] [pattern] [file...]

DESCRIPTION

       The  fgrep (fast grep) utility searches files for a character string and prints all lines that contain that string. fgrep is different from
       grep(1) and from egrep(1) because it searches for a string, instead of searching for a pattern that matches an  expression.  fgrep  uses  a
       fast and compact algorithm.

       The characters $, *, [, ^, |, (, ), and  are interpreted literally by fgrep, that is, fgrep does not recognize full regular expressions as
       does egrep. These characters have special meaning to the shell. Therefore, to be safe, enclose the entire string within single quotes (').

       If no files are specified, fgrep assumes standard input. Normally, each line that is found is copied to the standard output. The file  name
       is printed before each line that is found if there is more than one input file.

OPTIONS

       The following options are supported:

       -b	       Precedes  each  line  by the block number on which the line was found. This can be useful in locating block numbers by con-
		       text. The first block is 0.

       -c	       Prints only a count of the lines that contain the pattern.

       -e pattern_list Searches for a string in pattern-list. This is useful when the string begins with a -.

       -f pattern-file Takes the list of patterns from pattern-file.

       -h	       Suppresses printing of files when searching multiple files.

       -i	       Ignores upper/lower case distinction during comparisons.

       -l	       Prints 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	       Precedes each line by its line number in the file. The first line is 1.

       -s	       Works silently, that is, displays nothing except error messages. This is useful for checking the error status.

       -v	       Prints all lines except those that contain the pattern.

       -x	       Prints only lines that are matched entirely.

OPERANDS

       The following operands are supported:

       file	       Specifies a path name of a file to be searched for the patterns. If no file operands are specified, the standard input will
		       be used.

   /usr/bin/fgrep
       pattern	       Specifies a pattern to be used during the search for input.

   /usr/xpg4/bin/fgrep
       pattern	       Specifies one or more patterns to be used during the search for input. This operand is treated as if it were  specified	as
		       -e pattern_list.

USAGE

       See largefile(5) for the description of the behavior of fgrep when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

ENVIRONMENT VARIABLES

       See  environ(5)	for  descriptions of the following environment variables that affect the execution of fgrep: LC_COLLATE, LC_CTYPE, LC_MES-
       SAGES, and NLSPATH.

EXIT STATUS

       The following exit values are returned:

       0	If any matches are found

       1	If no matches are found

       2	For syntax errors or inaccessible files, even if matches were found.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

   /usr/bin/fgrep
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

   /usr/xpg4/bin/fgrep
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWxcu4			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ed(1), egrep(1), grep(1), sed(1), sh(1), attributes(5), environ(5), largefile(5), XPG4(5)

NOTES

       Ideally, there should be only one grep command, but there is not a single algorithm that spans a wide enough range of space-time tradeoffs.

       Lines are limited only by the size of the available virtual memory.

   /usr/xpg4/bin/fgrep
       The /usr/xpg4/bin/fgrep utility is identical to /usr/xpg4/bin/grep -F (see grep(1)). Portable applications  should  use	/usr/xpg4/bin/grep
       -F.

SunOS 5.10							    4 Oct 2002								  fgrep(1)
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