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0
votes
1answer
26 views

how to print the count of matched /unmatched patterns and print multiple patterns separated by line

how to print the count of matched /unmatched patterns and print multiple patterns separated by line. Input example (test.log): This 23 line has eight 8888 This 11 line has three 3333 need 12 to ...
1
vote
4answers
81 views

Impose character between repeated characters

Given a string of characters ,,a,,,b,,,, I want to impose the character - at the beginning, if no character is preceded comma, and between every comma that has no character. Meaning the result is ...
1
vote
2answers
69 views

BASH: count # of words in each line of a document

I need to identify patterns in a text file for further analysis. So the input files may contain semi-structured text as follows; file1 905:john: abc123: john@doe.com: US 920:eric: ericaA: ...
0
votes
1answer
26 views

Pattern matching on if block

I'm trying to match a pattern stored in a variable through an if block. As per my understanding, this should be a match and get "Match" echo statement. However, it doesn't seems to be matching. ...
1
vote
1answer
78 views

Pattern matching [duplicate]

I am trying to follow Bash Cookbook to learn about Bash Scripting. I am on example 6.8 Testing with Regular Expression. I have the following script: #!/usr/bin/env bash # cookbook filename: ...
3
votes
2answers
37 views

Searching /usr/dict/words to find words with certain properties

I would like to write a script to search through /usr/dict/words to find all words that meet some criteria I specify. For example, finding all palindromic words (like "racecar", "madam", etc.) or ...
1
vote
1answer
112 views

grep -f failing on a file edited in Windows

I just want to share a problem I had this morning using grep -f to obtain the patterns to match from a text file. Symptom $ echo 'sandbox/test/script.py' | grep -G '^sandbox/' sandbox/test/script.py ...
6
votes
2answers
201 views

Match the next pattern which is less than the previous match

I've got a file with QR-code lines and I want to grep for only those whose subsequences do not increase in length. Example: This one is good because the next sequence is less or same as previous: ...
5
votes
2answers
63 views

Scrabble helper in bash

I'm trying to make a scrabble helper in bash, which when given a list of characters, finds all the words in the /usr/share/dict/words file. For example, when given the letters a,c,r,t The word cart ...
0
votes
1answer
46 views

sed: multiple ranges between patterns, with one pass

I have a script that reads a file of about 3GB and sends it through a pipeline involving a very small number of replacements in a very small part of the file. To accomplish this with minimal overhead, ...
3
votes
5answers
3k views

How to create an array of unique elements from a string/array in bash?

If I have a string "1 2 3 2 1" - or an array [1,2,3,2,1] - how can I select the unique values, i.e. "1 2 3 2 1" produces "1 2 3" or [1,2,3,2,1] produces [1,2,3] Similar to uniq but uniq seems ...
10
votes
4answers
656 views

List files that match a pattern but ignore files that match another pattern?

Let's say I have a directory with files a1, a2, a3, b1, b2, b3. I only want to match files that start with a but don't contain 3. I tried ls -I "*3" *a* but it returns a1 a2 a3, even though I don't ...
2
votes
4answers
204 views

Need to print the matching lines in different file

For example, I have data like this 1111111 test1 test2 test3 1111111 block 1 block 2 block 3 1111111 page1 page2 page3 I would like to print the content as different files as shown below. Test1 - ...
1
vote
1answer
173 views

Why does this rename operation not work? [duplicate]

This works: $ touch abcdefg $ mv -v abcdefg abc[de]fg ‘abcdefg’ -> ‘abc[de]fg’ But this doesn't work: $ touch abcdefg $ mv -v abcdefg abc[d]efg mv: ‘abcdefg’ and ‘abcdefg’ are the same file ...
6
votes
4answers
402 views

Delete column that includes a specific text

I was looking for an option to delete a column with a specific text like "ddd" aaa bbb ccc ddd eee fff 1 2 3 4 5 6 2 3 4 5 6 0 So that the output looks likes this: aaa bbb ccc ...
1
vote
1answer
88 views

Recursively delete subdirectories not containing pattern on OSX

I am trying to delete all sub directories (and files inside) that do not contain one of two patterns in the directory name using Bash on OSX. I am trying to do this recursively - for a bunch of parent ...
0
votes
0answers
24 views

awk - how to reorder the contents of a file based on another pattern input file

I have a huge file with a list of names/characters in each line. The good thing is each line is unique, not sorted, but the order makes some sense and same needs to be retained. This is the file to be ...
24
votes
1answer
8k views

How do we specify multiple ignore patterns for `tree` command?

I need to print the directory structure of our production system and I would like to remove some specific directories from the tree? How do we specify multiple ignore patterns for tree command?
10
votes
5answers
2k views

Case matching pattern replacement with sed

I have a source code spread across several files. It has a pattern abcdef which I need to replace with pqrstuvxyz. The pattern could be Abcdef (Sentence Case) then it needs to be replaced with ...
1
vote
2answers
530 views

How to use logical OR in find?

In bash shell ls can use a logical OR functionality through (of course I could also do ls name1 name2 but my true examples are more complicated): ls @(name1|name2) Is there a way to do this using ...
0
votes
3answers
192 views

Shell pattern matching and arithmetic operators (+ - * / %)

This looks so simple but it isn't: [[ "1234+5678" =~ [0-9]+(\s*(\-|\*)\s*[0-9]+)* ]] && echo $? returns a 0. However, it actually should not do that, as only minus (-) and multiplication (*) ...
4
votes
2answers
3k views

ls pattern matching

I know that [] is working in ls pattern matching: $ ls foo.c foo.h $ ls foo.[ch] foo.c foo.h but I cannot find where this is documented. I would like to know the syntax that would match these: ...
-2
votes
1answer
67 views

Using 'grep' to search for a specific pattern [duplicate]

I'm playing with the Linux terminal and I have to do a exercise which states that I have to find inside a file for any line that contains at least an a, b and c, it doesn't matter it the lane has 2 a, ...
5
votes
3answers
520 views

grep for multiple regexes, and count the number of occurences

Say, I have a file, and multiple regexes have to be searched in it and the number of matches for each regex has to be counted. Thus, I cannot combine the patterns: grep -Po ...
3
votes
3answers
2k views

Find files that end with number

Im trying to make some backup script as the log files get bigger and bigger. What i have is coping the current file, (for example secure file in /var/log/) and remove the content from that file. But ...
2
votes
2answers
285 views

regex - Searching for only character pairs

I have the following data from which I mean to extract only those lines which contain "bb" only. Not "b" or "bbb" or anything else just "bb". abb abbb aabbcc aabab abbbbc Now when I use the ...
0
votes
1answer
38 views

to print line starting with desire number

I have some query relating to some files. Inputs : A=”1n” List=”R1 7n 3n” “R2 8n 1n” “R3 1n 2n” “R4 2n 3n” “R5 3n 4n” In output I want new list should start with the string having ...
1
vote
2answers
88 views

C Shell: different actions depending on the file type

I very new to C Shell. I am trying to read a file from the command line, and determine whether it's a zip file, a .txt, a symbloic link, a pipe, or whatever ("unknown"). Then I'd like to execute a ...
1
vote
5answers
195 views

How to delete files, symbolic in one folder, but leave its subdirectories unchanged?

Assume there is a folder that has files, symbolic links, and subdirectories as following: files: file1, file2, file3, file4 symbolic links: link1-->file2, link2-->file3 subdirectories: dir1, ...
1
vote
3answers
2k views

Remove patterns from string using bash

I'm trying to remove some patterns from a file input string (parsing file line by line). Here is a sample string: 1: (10/17 12:49:31.175) - CONSTANT ID1 - CONSTANT ID2: RAW DATA OUT > ...
-1
votes
2answers
796 views

Matching multiple patterns with ls

I'd like to get a list of fail logs in the current directory for use in an outside script, the logs are determined with the pattern FAIL in the filename, so I've been using a FAIL* to feed my script ...
4
votes
1answer
41 views

Initializing search in vi before starting

I use a small program I wrote that takes a regular expression pattern as parameter and searches 2000+ files. The files are in a directory hierarchy. The pattern can be in multiple files and multiple ...
0
votes
2answers
2k views

Shell pattern matching vs. regular expressions occurence [duplicate]

I am relatively new to Unix, and I stumbled across one curiosity. Some shell constructs like case or find, employ pattern matching, but it is not quite regex. Other commands, like ed, sed, vi, and ...
2
votes
3answers
469 views

Should I embed a command in a conditional or test its return code?

It's a simple question of best pratices: Which should I use? Option 1 ping -c1 "$host" if [[ $? -eq 0 ]] ; then command else command fi Option 2 if ping -c1 "$host" ; then command ...
3
votes
4answers
660 views

How to remove text matching specific patterns from a file

I want to compare two files to check for differences between them, fileA and fileB. fileA is like a template file and fileB is the file which I want to compare to it. Anytime I find a difference I ...
2
votes
3answers
2k views

find command: -or option doesn't work

I want to execute a command for an each file that matches a pattern. But the command that seems to be right, doesn't work for me, I have no idea why. $ find . -type f -name '*.c' -or -name '*.h' -or ...
2
votes
6answers
999 views

How to search, replace and append a pattern to the end of each line

I have the following list of items: bigBone fishMarket dogCollar ... I need to generate a two character mapping like this: bigBone -> bb fishMarket -> fm dogCollar -> dc ... How can I ...
3
votes
1answer
1k views

How to find files that contain newline in filename?

I am trying to find files that have a newline in the filename. But I can't figure out what pattern to use. The following works, but is not very useful if I want to use it in indented code. find . ...
5
votes
6answers
7k views

How to match exact string using `sed`? But not the part of it.?

I have a input file FILE1.TXT as below. 11 id1 12 13 AGE = 20 14 NAME = NAME1 15 16 id2 17 18 AGE = 30 19 NAME = NAME2 . . . 110 idXYZ 111 112 AGE = AGEXYZ 113 NAME = ...
6
votes
3answers
1k views

Is it possible to match multiple specific line numbers (not range) with sed?

Consider: echo -e "a\nb\nc\nd\ne\nf\ng\nh" | sed '3,5a test' This will match lines 3, 4 and 5. But I am trying to match only lines 3 and 5 (not 4). And append 'test' after them.
2
votes
2answers
877 views

How do I check that a filename conforms to a pattern?

I'm tasked with writing a shell script which checks that a filename conforms to a specific pattern and I'm not sure how to go about it. The filename should follow a pattern which looks like: ...
3
votes
2answers
3k views

How to find frequency of occurrences of strings contained in a file?

I have a file that contains a list of URLs of the form EDIT http://www.google.com/absd/siidfs/kfd837382$%^$&, www.google.com, google.com yahoo.com/list/page/jhfjkshdjf... I ...
2
votes
3answers
14k views

Multiple pattern match and print in single line

I need to match two patterns in a log file and need to get the next line of the one of the pattern (out of two patterns) that is matched, finally need to print these three values in a single line. ...
3
votes
3answers
993 views

Rename the last 8 characters in filename

I am receiving video files with different names but the final 8 characters of all are numbers (also different every time). This is the pattern of the file name: custom text 00030402.avi I have to ...
2
votes
1answer
1k views

wget recursive with files without extension

I'm not very good with Linux so I have maybe a basic question. I've search around for the "how to" and I couldn't find anything. I'm trying to get a site with wget. The problem is that it: Have ...
5
votes
2answers
346 views

Modifying zsh globbing patterns to use with cp

I'm trying to write a script to copy files recursively from a particular folder except files A.extn, B/*.extn and C/* where B and C are directories and extn is just some generic extension. This is ...
0
votes
3answers
1k views

How to find files ending with ~ and pyc? [duplicate]

I want to find all files (in current and all subdirectory) which end in'~' or 'pyc'. To do so I have tried the following find pattern: find . -name '*{~,pyc}' find . -name '{*~,*.pyc}' but neither ...
10
votes
5answers
4k views

Pattern matching on path names in bash

I want to act on a list of subdirectories in a directory. Consider: for x in x86-headers/*/C/populate.sh; do echo $x; done This gives x86-headers/elf/C/populate.sh x86-headers/gl/C/populate.sh ...
12
votes
1answer
9k views

What is the .gitignore pattern equivalent of the regex (Big|Small)(State|City)-[0-9]*\.csv

I have a regex I stuck in my .gitignore similar to: (Big|Small)(State|City)-[0-9]*\.csv It didn't work so I tested it against RegexLab.NET. I then found the gitignore man page which led me to ...
1
vote
2answers
1k views

Pattern matching exception for shell script

So I have the following shell script for batch renaming the episodes of some given TV series: #!/bin/bash #script for renaming files of form "*01*.ext" to "Episode 01.ext"; counter=0 for all_files in ...