Sed is a command-line stream editor for filtering and transforming text.

learn more… | top users | synonyms

5
votes
2answers
275 views

How is the inplace modification of a file being done?

What does the "inplace" modification of a file e.g. via sed -i or perl -i mean? My question is about how this inplace modification is done. Is the file copied the modification is done in the copy and ...
2
votes
1answer
50 views

What package has GNU sed for Solaris?

I need to use the features of GNU sed, instead of the built-in version under Solaris 10. Which GNU package contains it? I don't see it listed in the coreutils, and my Google searches haven't helped ...
3
votes
1answer
69 views

Is there a way to pass a variable from an awk statement to a bash function as an argument? [closed]

I am trying to look a for some specific values from (such as 1 or 4 and 2 or 3) a text file using an awk statement in a bash script. If this value is found in the file (within the awk statement), then ...
2
votes
3answers
48 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
56 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 ...
5
votes
2answers
181 views

Comment all lines from last commented line to line with 'foo'

Consider a text file users.txt: #alice #bob charlie dotan eric I need to comment everything from (exclusive) the last commented line until (inclusive) dotan. This is the result: #alice #bob ...
4
votes
3answers
116 views

Frequency of words in non-English language text: how can I merge singular and plural forms etc.?

I'm sorting French language words in some text files according to frequency with a focus on insight rather than statistical significance. The challenge is about preserving accented characters and ...
4
votes
3answers
156 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
63 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 ...
5
votes
2answers
499 views

Does `sed` exist in all *nixes?

My application will be running on all versions of Unix-based OS, say, Linux, MacOS, HP-UX, Sun Solaris , OSX, etc. I'm using the following sed command in a common place to delete the string matched ...
3
votes
3answers
123 views

“Tuning” tr and sed expression

I have MD5 file which lists filename and MD5 sum in the following way: MD5 (file14n0001.xml.gz) = 04eb2524d271077ec8f1a0021779b171 MD5 (file14n0002.xml.gz) = 07e2b29645e9211cce9daf1ae27e7b99 MD5 ...
2
votes
3answers
144 views

sed + remove the first directory from path

Please advise on how to remove the first directory from a path by sed, (the inverse pf what basename does). For example echo "/mnt/VPfig/Amer/AR4/Celtel/files/COM.txt" | sed ... I should get: ...
2
votes
1answer
70 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 ...
1
vote
3answers
31 views

Delete whole line if after “:” less than 4 chars

I have a file with many lines, such as : blue:fish red:tomato black:moon I would like the whole line to be deleted if after ":", there is less than 4 chars. Thanks for your help!
3
votes
2answers
108 views

Counting comma separated characters in a row

How can I count how many elements are separated with comma in a given column of a file (tab_delimited), using awk or sed? Exemple: AC 1,23,5 DC 2,8,89 Would return: AC 3 DC 3
4
votes
3answers
104 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 ...
0
votes
2answers
24 views

Replace selected caracters

How can one replace only the first [:space:] character in each row of a file with a \t using sed ? Input: AC 12 45 DC 56 89 Expected output: AC 12 45 DC 56 89 (Something like sed ...
3
votes
1answer
31 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 ...
2
votes
3answers
43 views

Merging multiple files by row

Is it possible to copy the rows of File1 and File2 in a new File4 following the instruction given by File3 by using a simple bash script (sed? awk?). File1: /*two or more columns, tab delimited*/ ...
1
vote
2answers
81 views

Replace columns using a shell

How could I replace column 1 in File1 with column 2 in File2, when a match is found? File1 id1 36987 id2 75685 id3 12345 id4 12896 File2 id1 ID1 id2 ID2 id3 ID3 id5 ID5 I'd like to write this on ...
2
votes
1answer
87 views

Compare the values of a column with all the values in another column

I have 2 input files. Each line of File1 should be compared to each and every line of File2. Logic is: If Column1 of File1 does not match Column1 (all the values under it) of File2, then print the ...
2
votes
1answer
34 views

SED and PDSH: adding a line to a file on a slave node in a cluster

I am trying to add a new line containing GATEWAY=10.0.10.1 to the /etc/sysconfig/network file on each of 32 slave nodes in a cluster. I read this post on how to insert a line with sed. This works for ...
0
votes
2answers
42 views

Using sed to remove string from list of files fails

I'm on bash (Mac OS X). I have a list of files and there's a string I want to remove: $ grep -l \</html\> *.html 21888601.html 21906283.html 21977081.html ... All matching files are ...
1
vote
3answers
93 views

sed - replace string with file contents

I have two files: file1 and file2. file1 has the following contents: --- host: "localhost" port: 3000 reporter_type: "zookeeper" zk_hosts: - "localhost:2181" file2 contains an IP ...
6
votes
4answers
150 views

How to insert lines with numbers from X to Y into another file after line Z?

I created two files: echo -e "1\n2\n3\n4\n5" > 123.txt echo -e "a\nb\nc\nd\ne" > abc.txt I want to get the file 123.txt with the following contents: 1 2 3 b c d 4 5 So in other words ...
3
votes
1answer
33 views

Matching several patterns on one line

I often use a program called tty0tty, which creates a null modem using PTYs. Now I want to make it part of an automated process. When I start tty0tty it prints (/dev/pts/1) <=> (/dev/pts/2) ...
1
vote
3answers
53 views

Sed + how to set parameters in sed command in order to display lines from text file

I find the following way to print line from file In this example we want to print the first line from the hosts file sed -n '1,1p' /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 ...
6
votes
5answers
233 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 ...
6
votes
4answers
164 views

Replace \n by a newline in sed portably

I'm so confused with GNU sed, POSIX sed, and BSD sed's myriad of options. How do I replace literal \n with the newline character using these three sed types?
4
votes
4answers
160 views

Match two words that is on the same line

The command that I have prints out two of the lines whenever FW_6.0.0 is found, below is the code: grep -oP 'FW_6.0.0, (.*)$' file Below is the output, both has the same value of FW_6.0.0 ...
1
vote
1answer
43 views

Retrieving fasta sequences using bed file information from locally installed file

I have a .bed file containing around 30000 rows for which I have the sequences retrieved using fetch-sequences module of the rsat tool (http://rsat.ulb.ac.be/rsat/help.fetch-sequences.html#usage). ...
2
votes
1answer
41 views

Strip color on OS X with BSD sed (or any other tool)

I'm on OS X, which has a BSD version of sed (which I'm guessing is inferior to a GNU version on Linux), and all the techniques for removing color on commandlinefu.com did not work. I tried replacing ...
1
vote
3answers
35 views

How to truncate only given column length?

INPUT: a@notebook:~$ cat in.csv 'XYZ843141'^'ASDFSAFXYVFSHGDSDg sdGDS dsGDSgfa assfd faSDFAS saDFSAFD adFSA343fa sdfSADF'^'BAAAR'^'YYY'^'..... and so on, further columns ...
3
votes
3answers
188 views

String replacement in file

I have the following file: <?xml version="1.0" encoding="utf-8"?> <!--Generated by crowdin.net--> <string name="test" >- test</string> <string name="test" ...
2
votes
1answer
52 views

Change a specific line using sed

I need to change a line in a Java file called DbConnection.java using the sed command. The line is: connection = DriverManager.getConnection("jdbc:mysql://**localhost**/**bajaj**","**root**", ...
2
votes
1answer
91 views

Extract download progress from curl output

I'm trying to extract the download progress of a file that's being retrieved by curl. I tried this, but this doesn't work: curl --progress-bar http://127.0.0.1/test.tar.bz2 -o test.tar.bz2 ...
6
votes
4answers
443 views

how to remove ctrl F in unix file

While editing a unix file I'm getting data as below in vi editor. MGW:^FVMG107 MGW:^FVMG113 MGW:^FVMG108 MGW:^FVMG103 where in above data ^F is not viewable in cat command. I have tried dos2unix ...
2
votes
2answers
59 views

new pattern required from an input file using sed or awk

I have data as below: MGW: VMG110 836-16 836-18 836-19 336-20 836-23 MGW: VMG120 3802-1 3802-2 3802-3 3456-1 3456-4 Required output is: VMG110:836-16&-18&&-20&-23 ...
1
vote
1answer
29 views

How to echo from specific line of a file to another specific line [duplicate]

Assume I have a file with about 10000 lines. How can I print 100 lines, starting from line 1200 to line 1300?
2
votes
3answers
52 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 ...
5
votes
2answers
72 views

Grepping for a block of text with parts that can be optional

I have multiple entries that describes an event in a very large log file, say A.log. I would like to do two things with the event entries in the log file: Count the number of occurrences of each ...
2
votes
1answer
68 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 ...
3
votes
6answers
72 views

Collapse some repeated parts of successive lines

I have data in notepad like this: 4480-1 4480-2 4480-3 4480-15 4581-1 4581-2 4581-3 4581-4 Can we do it using for loop sort of things? With sed? My required output is ...
2
votes
3answers
59 views

replace a character from a string that is in between first and second search using sed or awk

I need to replace _ (underscore) with ? (question mark) in a file containing email addresses. The file looks like below: EFT_020034-E015133 20140624 /ACC/EMAIL+test_1@mysite.com SHR ...
3
votes
2answers
159 views

Search a string with last two characters as numeric

Suppose I have a file like this: adasfddfd09 dsassd90897 323sdsdsdsd sdddsdf56 dfdf45fdfdf I want to search only those strings which have last two characters numeric with sed, grep and awk.
4
votes
3answers
161 views

Extracting text using sed does not work as expected [duplicate]

I am just starting out using sed and I intend to use it to extract IP addresses from ping output. Here's what I am trying to achieve exactly: input text: ytmti (192.188.2.3) jjggy desired ...
1
vote
2answers
42 views

Formatting a floating point variable in a SED statement

As part of a makefile recipe, I want to repeatedly adjust a few lines in some text file txt.in. In particular, I want to update, among others, the third line which contains simply two numbers ...
0
votes
2answers
50 views

Fastest & Most Core way to replace “\r\n” with “\n” in a file?

I suppose tr is a more core method and thus probably a faster way to replace things within a given file. However tr can only replace equal amounts of characters. meaning... 2 characters can only be ...
0
votes
5answers
67 views

More concise methods for wrapping a file than using sed

Introduction script: sed -i '1i <?xml version=\"1.0\" encoding=\"utf-8\"?>' $1 sed -i '/<?xml version=\"1.0\" encoding=\"utf-8\"?>/a<hello>\n\t<world>' $1 sed -i ...
4
votes
4answers
182 views

How to get lines 10 to 100 from a 200 line file into a new file [duplicate]

I have file with 200 lines. I need to extract lines from 10 to 100 and put them into a new file. How do you do this in unix/Linux? What are the possible commands you could use?