Login or Register to Ask a Question and Join Our Community

Sponsored Content
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
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

grep for multiple patterns

I want to get a list of all the files in the current directory that have two patterns. I can do first grep of one pattern and then with the output do the grep of the second pattern. if the output of 1st pattern search results in many files, it is very difficult to do a grep of the 2nd pattern for... (1 Reply)
Discussion started by: tselvanin
1 Replies

2. Shell Programming and Scripting

Grep multiple patterns

Hi, Can we grep multiple patterns in UNIX. for example: cat /x/y/oratab | grep -i "pattern1|pattern2" .... etc I require the syntax for multiple patterns. | is not working as I explained in example. Malay (4 Replies)
Discussion started by: malaymaru
4 Replies

3. Shell Programming and Scripting

Grep for Multiple patterns

Hi All, I have a file. I need to find multiple patterns in a row and need those rows to divert to new file. I tried using grep -e / -E / -F options as given in man. But its not working. ==> cat testgrep.txt william,fernandes,xxxxx mark,morsov,yyyy yy=,xx= yyyy=,xxxx== ==>... (7 Replies)
Discussion started by: WillImm123
7 Replies

4. Shell Programming and Scripting

grep for multiple patterns

I have a file with many rows. I want to grep for multiple patterns from the file. For eg: XX=123|YY=222|ZZ=566 AA=123|EE=222|GG=566 FF=123|RR=222|GG=566 DD=123|RR=222|GG=566 I want the lines which has both XX and ZZ. I know I can get it like this. grep XX file | grep YY But... (10 Replies)
Discussion started by: tene
10 Replies

5. UNIX for Dummies Questions & Answers

replace multiple patterns in a string/filename

This should be somewhat simple, but I need some help with this one. I have a bunch of files with tags on the end like so... Filename {tag1}.ext Filename2 {tag1} {tag2}.ext I want to hold in a variable just the filename with all the " {tag}" removed. The tag can be anything so I'm looking... (4 Replies)
Discussion started by: kerppz
4 Replies

6. Shell Programming and Scripting

Match multiple patterns in a file and then print their respective next line

Dear all, I need to search multiple patterns and then I need to print their respective next lines. For an example, in the below table, I will look for 3 different patterns : 1) # ATC_Codes: 2) # Generic_Name: 3) # Drug_Target_1_Gene_Name: #BEGIN_DRUGCARD DB00001 # AHFS_Codes:... (3 Replies)
Discussion started by: AshwaniSharma09
3 Replies

7. Shell Programming and Scripting

Grep and replace multiple strings in a file with multiple filenames in a file

Hi, I have a file containing list of strings like i: Pink Yellow Green and I have file having list of file names in a directory j : a b c d Where j contains of a ,b,c,d are as follows a: Pink (3 Replies)
Discussion started by: madabhg
3 Replies

8. Shell Programming and Scripting

Grep from multiple patterns multiple file multiple output

Hi, I want to grep multiple patterns from multiple files and save to multiple outputs. As of now its outputting all to the same file when I use this command. Input : 108 files to check for 390 patterns to check for. output I need to 108 files with the searched patterns. Xargs -I {} grep... (3 Replies)
Discussion started by: Diya123
3 Replies

9. Shell Programming and Scripting

Replace multiple patterns together with retaining the text in between

Hi Team I have the following text in one of the file j1738-abc-system_id(in.value1)-2838 G566-deF-system_id(in.value2)-7489 I want to remove system_id(...) combination completely The output should look like this j1738-abc-in.value1-2838 G566-deF-in.value2-7489 Any help is appreciated... (4 Replies)
Discussion started by: Thierry Henry
4 Replies

10. Shell Programming and Scripting

How to use grep with multiple patterns?

I am trying to grep a variable with multiple lines with multiple patterns below is the pattern list in a variable called "grouplst", each pattern is speerated by "|" grouplst="example1|example2|example3|example4|example5|example6|example7" I need to use the patterns above to grep a... (2 Replies)
Discussion started by: ajetangay
2 Replies

LEARN ABOUT NETBSD

zgrep

ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME

     zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files

SYNOPSIS

     zgrep [grep-flags] [--] pattern [files ...]

     zegrep [grep-flags] [--] pattern [file ...]

     zfgrep [grep-flags] [--] pattern [file ...]

DESCRIPTION

     zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1).

     The grep-flags and pattern arguments are passed on to grep(1).  If an -e flag is found in the grep-flags, zgrep will not look for a pattern
     argument.

     zegrep calls egrep(1), while zfgrep calls fgrep(1).

EXIT STATUS

     In case of missing arguments or missing pattern, 1 will be returned, otherwise 0.

SEE ALSO

     egrep(1), fgrep(1), grep(1), gzip(1), zcat(1)

AUTHORS

     Thomas Klausner <wiz@NetBSD.org>

BSD
								 December 28, 2003							       BSD
All times are GMT -4. The time now is 10:37 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy