2
votes
3answers
22 views

Reverse match in sed, replace opposite of what was found

Say I have this output from my syslog, precalculated src_hash => 20 bytes @ 0x7f811c001e20 A6 2D E5 CD 2A BA F0 42 56 66 19 D4 61 1A E3 A0 .-..*..BVf..a... C7 5E 5F 77 ...
4
votes
2answers
46 views

sed regex issue

I'm trying to replace a string in a file: $RELEASE = '1234'; The whitespace between RELEASE and the = symbol could be either spaces OR tabs. The quotes around the version number could be either ...
4
votes
3answers
121 views

Regex alternation/or operator (foo|bar) in GNU or BSD Sed

I cannot seem to make it work. GNU sed documentation says to escape the pipe, but that doesn't work, nor does using a straight pipe without the escape. Adding parens makes no difference. $ echo ...
1
vote
4answers
52 views

Simple sed replacement of tabs mysteriously failing

This ought to be really simple, but for some reason it is not working: sed -i.bak -E 's/\t/ /' file.txt Instead of replacing tab characters, it's replacing t characters. I've tried every ...
2
votes
1answer
39 views

Removing non-printable characters using POSIX sed

Files created with roff and other "old-school" tools (for example man pages on many Unix systems) generate bold and underlined text in minimalistic terminals using tricks involving non-printable ASCII ...
4
votes
3answers
93 views

Search and replace strings that are not substrings of other strings

I have a list of replacements like so: search_and -> replace big_boy -> bb little_boy -> lb good_dog -> gd ... I need to make replacements for the above, but at the same time avoid ...
3
votes
1answer
26 views

How do back-references match in sed?

I found a one-line sed command on this site which removes duplicate entries in $PATH. There is one concept that I can't get my mind around. It uses saved matches in the match section to detect the ...
6
votes
5answers
225 views

Strategy to extract movies's name from this ununiform dataset?

I am working on a movie database problem to improve regular expressions, this is the problem I'm running into. My dataset looks like this: Movie Name (variable space and tabs) year Movie1(can ...
2
votes
3answers
48 views

A challenge for sed convert code from Mathematica to Matlab

I have the following output from Mathematica to C code: $ cat file.txt Complex(1.3, 2.7)*Power(kappa, 2.0) + Complex(0.3, 2.0)*Power(kappa,5.0)*log(alpha) The file is extremely long (many tens of ...
2
votes
1answer
64 views

sed regexp HEX char

i have this string: echo -e "a12\x8fb12\x9f"|xxd 0000000: 6131 328f 6231 329f 0a a12.b12.. i want delete this sequence string 12\x9f and 12\x8f with sed. i can do it with this ...
0
votes
4answers
62 views

Print text between tags (inclusive) if certain text is found

I've got a task to extract data from several Apache servers. The task is to print out: <Directory ...> ... </Directory> where +ExecCGI is located within. Let me give an example to ...
1
vote
2answers
81 views

Regular expression find 3 or 4 numbers

So, I have 50+ words and I have to match the numbers in them. These numbers can be 3 or 4 digit numbers. I think I tried every way there is, but nothing seems to work (I need to remember the number as ...
0
votes
1answer
57 views

Search for pattern across multiple files and replace a sub-part in all occurences

I am helping a friend with her thesis written in LaTeX and I need a quick solution for a "search and replace". Using a terminal in Linux, how can I find the following pattern: \caption{*\cite{*}} ...
0
votes
1answer
101 views

bash using grep and sed

This is for our weekly prac, no marking or grade (we don't even get the answers!) I'd really appreciate it if anyone has the time to help explain this exercise to me, as I'm trying to get this work ...
2
votes
2answers
156 views

How can I extract the numbers in the file using sed or any other tool?

I have a file that has this format [ 2014/05/01 10:48:26 | 13963 | DEBUG ] It took 11.16837501525879 seconds to complete the process So I have thousands of lines like this and I would like ...
0
votes
1answer
67 views

Want to replace the words with space in multiple files using SED commmand [closed]

Want to replace the words with space in multiple files using SED commmand I have a word as 'Danny' with single quotes in many of my files in multiple directories which I want to change to 'Danny ...
3
votes
3answers
225 views

Regex not matching

why this does not match..? sed -e '/--Updated?[[:space:]]+Date/d' inputfile this..: --Updated Date: 2013-11-06 15:32:13 d? is because sometimes I have Update Date, and sometimes Updated Date. ...
1
vote
2answers
43 views

How can I append multiple extensions to a string with sed?

I want to create a script that will let me download images from entire subreddits at once, but I'm currently stuck on just getting the links right (one problem at a time! ^^). Anyway, since I can't ...
2
votes
2answers
100 views

Regex `/pattern/g` and ed `:g/pattern/`: which came first, and why `g`?

The g option (e.g. s/pattern/replacement/g) for many tools that use regex-style pattern matching and the :g command in ed/ex/vi/vim have pretty similar usage and meaning: match the given regex ...
4
votes
4answers
555 views

Print line after nth occurrence of a match

I am looking to display the line 4598 in the following file. Effectively I want to display the line AFTER the nth occurrence of a match. In this case, the line after the 3rd occurrence of <Car>. ...
2
votes
1answer
126 views

Counting consecutive repetitions of a specific character (e.g. ,)

Say I have a file with lines like the two following: foo,bar,,baz,xy foo,,bar,baz,xy,, I would like to count how many times I have ,, (two consecutive commas surrounded by any other character) in ...
1
vote
1answer
63 views

Why isn't sed using the extended regex mode by default?

I am using sed. I was using a regex that was correct as far as I could see but sed did not do anything. Turns out that I was using \s+ which sed can not understand (?) and when I switched to [ ]+ it ...
2
votes
2answers
55 views

Why don't I need to escape a character class in sed but I need to escape the rest?

I am confused with sed. I had a file with the following contents: [ 2014/02/10 14:45:15 | INFO ] Saving data for customer: 273667 [ 2014/02/10 14:45:15 | INFO ] Saving data for customer: ...
2
votes
2answers
140 views

SED change only start of line and preserve end of line

Basically I have a situation where I frequently need to modify my hosts file to access different servers at my workplace. In an attempt to automate the process. I've been trying to use sed to make the ...
1
vote
1answer
134 views

How to get the JSON STRING from the given string

I have a string given below. I just need to get the first accountHeader (bolded) JSON string, I tried everything.. It didn't work. Can you help me to get the data? <START ...
0
votes
1answer
49 views

All occurrences of a regex get removed without using the “global” modifier

I have the following text in the file sentence.txt Linux refers to the family of Unix-like computer operating systems that use the Linux kernel. Linux can be installed on a wide variety of ...
5
votes
6answers
552 views

Replace a character except last x occurences

I have a file that has a bunch of hostnames correlated with IPs that looks like this: x-cluster-front-1 192.168.1.2 x-cluster-front-2 192.158.1.10 y-cluster-back-1 10.1.11.99 y-cluster-back-2 ...
4
votes
2answers
83 views

Why sed prints first string from file even if it's failed to find matching groups

I'm trying to write sed expression which will extract matching groups from file. E.g. I have .cue sheet and I want to extract it's genre tag. It has following format: $ cat file.cue | grep GENRE REM ...
1
vote
1answer
119 views

Parsing csv with sed and perl one-liner?

I have a web server which stores configurations to PostgreSQL, and I plan to retrieve information from a certain table and then later parse it into csv format. PAYLOAD <?xml version="1.0" ...
0
votes
2answers
213 views

bash script, printing multiple lines that matching to a specific patern

I have a log file and I'm making a script to do some actions. An action is to print a specific area of the log. Every block at the log starts with a specific time stamp and inside the block may have ...
1
vote
2answers
127 views

Ensure /etc/export contains rule using bash

What's a working example of modifying /etc/export using bash? Example: I want to ensure the following rule is present and valid: /export/home 2400:123::/32(rw,no_root_squash) And it should: Add ...
1
vote
2answers
170 views

What does this regex mean?

I was working on the conversion of Unix newline to Windows newline. I tried to unix2dos but it gave me some binary error, so I looked it up and stumbled upon this regex sed 's/$'"/`echo \\\r`/" ...
3
votes
3answers
180 views

sed - how to (not) match unmatched brackets

How can I do my operation only on lines that close their brackets? For example I want to change ".is" lines and add a bracket but not for lines with unclosed brackets. so these are changed ...
0
votes
2answers
1k views

sed - how to exclude multiple patterns in the match

I have currently a set of seds that's working well except for one thing. The particular expression I'm having an issue with is: sed -i '/[^}.to]\.to[[:space:]]/ s/\(\S\)/expect(\1/' ...
3
votes
1answer
1k views

Get all regex matches between two patterns and print them to file

I've got a file with a bunch of long lines. I'd like to grab every group between two patterns and print them to a new file, one match per line. I could manage to do this with Python, but I'd prefer ...
1
vote
1answer
54 views

How to match a literal '*' with sed?

I have this line in my file called test.php 'dbs_password' => 'a8b*cyP0', and want to replace into: 'dbs_password' => 'password-here', So I use this sed command with syntax: $ sed -e ...
1
vote
3answers
54 views

Stuck in separating chars into strings in my approach. Found a working approach but can not understand it

I am trying to figure out how to break a string to be on character per line. I.e ahebhaaa to be: a h e b h a a a I tried: $ echo ahebhaaa | sed 's/\(.\)\(.\)/\1\n\2/g' I.e. my ...
4
votes
2answers
213 views

Why do I need to escape regex characters in sed to be interpreted as regex characters?

It seems e.g. cat sed_data.txt | sed 's/\b[0-9]\{3\}\b/NUMBER/g' that I must escape characters to form a regular expression. In this case I had to escape braces in order to be interpreted as a number ...
1
vote
2answers
494 views

sed : Ignore line starting whitespace for match

I want to replace the default listening port of httpd to 9090. I can edit the line in httpd.conf file using below sed -i "/^Listen/c\Listen 9090" /etc/httpd/conf/httpd.conf But the line Listen 80 ...
1
vote
2answers
126 views

Remove 2 and 3 newlines in a text file but not 1

I'm developing on a max osx 10.8 and have no preferences to which tool to use probably sed but it doesn't matter. Update after comment: The input file uses windows new lines if that's complicates ...
4
votes
1answer
300 views

grep: display filename once, then display context with line numbers

Our source code has error codes scattered throughout. Finding them is easy with grep, but I'd like a bash function find_code that I can execute (eg. find_code ####) which will provide output along ...
2
votes
3answers
91 views

Pulling out keywords using standard command line utilities?

As an example, this is the pronunciation of "when" according to Wiktionary. enPR, IPA and X-SAMPA are different schemes for showing pronunciations. when:* {{a|US}} {{enPR|wĕn|hwĕn}}, ...
5
votes
1answer
175 views

Execute a command within 'sed'

I have a list of random memory addresses saved in a text file, and I need to sed them out, decode them, and save them back to my file. However, the decoding operation I'm trying to perform is handled ...
3
votes
4answers
276 views

Replace all occurences of \ except \N

I have a file like this: 1,2,subjects,\mat\hs,unix\,\Nato,\N,123,\N I want to replace all occurences of \ with #, except for \N, such that the output looks like this: ...
1
vote
2answers
110 views

Backreferencing with sed

I have a database containing a list of unsigned longs representing a bunch of memory addresses followed by an offset within two brackets (e.g. Mem[offset], 0x2322AD4[3]), and some other data. What I ...
1
vote
2answers
129 views

Tell a regex expression to skip the beginning of a line before matching

If I had a string like 45mb ./aaaa/bbbb/cccc/dddd and I use a regex like [^\/]*\/ it will match 45mb ./aaaa/bbbb/cccc/ I only want it to match ./aaaa/bbbb/cccc/ but I can't figure out how to do ...
1
vote
1answer
81 views

What are the commands that you can use in the beginning of a sed command?

I initially learned to do sed search and replace like so: sed -e 's/<stuff>/<replacement>/' However I recently learned that these will do something different based on what command ...
0
votes
3answers
118 views

Removing second colon

Trying to create a simple script that lists mass mailing by the queue number that appears in /var/log/maillog. I'm starting off with this: [root@ditirdlns01 ~]# lsMails(){ grep -i ...
3
votes
3answers
4k views

extract part of string using sed

ls lib/oracle-11.2.0.3.0.txt | sed 's/lib.\([oracle.*]\)\.txt/\1/' It is giving the whole string instead of just oracle part until .txt What am I doing wrong? I can do it using awk as follows, but, ...
0
votes
4answers
3k views

Extract substring using regular expression on a Unix file

I have file with below contents . /ABC/RTE/AD_900_VOP_123/OPP /ABC/RTE/TRE/AD_900_VOP_145/BBB /ABC/RTE/AN_900_VFP_124/FBF /ABC/RTE/HD_900_FOP_153/WEW /ABD/RDV/AD_900_VOP_123/OPP ...