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

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6
votes
2answers
910 views

How would I sort these directory names numerically?

I'm aware that I can somehow sort this output numerically (so cpu1/ follows cpu0/) ... I could probably get something to work eventually by splitting up the string various ways with awk, but is there ...
6
votes
1answer
2k views

Why isn't sed greedy in this simple case?

$echo "foo 65 bar" | sed -n -e 's/.*\([0-9]\+\).*/\1/p' 5 Why is the output not 65? Shouldn't sed greedily match the [0-9]\+ part? How do I tell sed to match all of 65?
6
votes
3answers
522 views

Sed alternative for search and replace on very long lines

I have files that were generated by a program that did not put newlines at the end of records. I want to put newlines between the records, and I can do so with a simple sed script: sed -e ...
6
votes
5answers
477 views

Remove backslash + newline sequences

We are having a file in Linux which contains one line per record, but problem comes when the line contains some new line characters. In this case, the backslash is appended at the end of line and the ...
6
votes
3answers
968 views

Replace multiple strings in a single pass

I'm looking for a way to replace placeholder strings in a template file with concrete values, with common Unix tools (bash, sed, awk, maybe perl). It is important that the replacement is done in a ...
6
votes
1answer
150 views

Why can't I escape the braces “]” in sed?

Question: Why can't I escape the "]"? $ printf "*#$@~\!&*()[]\n" *#~\!&*()[] $ printf "*#$@~\!&*()[]\n" | sed 's/[*#$@~!&*()\[\]]//g' *#~\!&*() $
6
votes
3answers
298 views

Replace uppercase to lowercase except first letter of each word in specific line

I want to replace names that I received in uppercase letters only. The names are mixed with other information which should stay as it is. AUTH: at the beginning of the line identifies it as a line ...
6
votes
2answers
567 views

what is the meaning of this sed command: `;/@/{h;s/test/next/g;x;G}`?

sed -e 's/72;/72, next_val = 0x11111111;/;/@/{h;s/test/next/g;x;G}' fmt_vuln.c > fmt_vuln2.c could you tell me about what is the meaning of ;/@/{h;s/test/next/g;x;G}?
6
votes
3answers
7k views

Filter a .CSV file based on the 5th column values of a file and print those records into a new file

I have a .CSV file with the below format: "column 1","column 2","column 3","column 4","column 5","column 6","column 7","column 8","column 9","column 10 "12310","42324564756","a simple string with a , ...
6
votes
2answers
374 views

sed replace only lines with matching groups

Currently, I have this command: sed 's/\([^C]*\)/\1AB/' It inserts "AB" before the first instance of "C" on a line. But it is also adding "AB" at the end of every line without a "C". How can I ...
6
votes
1answer
109 views

How can I extract/change lines in a text file whose data are separated into fields?

How can I manipulate field-based data from the commandline? For example How can I print only lines whose Nth field is foo? How can I print only lines whose Nth field isn't foo? How can I print only ...
6
votes
2answers
3k views

Remove unknown unicode character from textfiles - sed, other bash/shell methods

I need to search and replace all occurences of an unknown character in some files having the same name. Opening such files with vi, I read <91> code for that character. Opening them with nano, I ...
6
votes
2answers
248 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, and vim have pretty similar usage and meaning: match the given regex ...
6
votes
2answers
282 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 ...
6
votes
3answers
2k views

Multi-line replace

I spent ages trying to figure this out. As it happens, I don't need to do it any more; I found another way. But for the sake of my sanity, I'd like to know the answer anyway. It's quite easy to use ...
6
votes
3answers
130 views

How to use sed to manipulate continuously streaming output?

I am putting together a presentation for a non-technical audience. I have a program running in bash that outputs a continuous stream of values, a few of which are important. I would like to highlight ...
6
votes
3answers
1k views

How do I stop sed from adding extra newline characters

I am running the following 2 sed commands. The first one adds newline characters where I want them, the second also adds newline characters where I want them, BUT also adds an extra one at the end of ...
6
votes
2answers
187 views

How come sed is so fast?

I thought about whether this question is suitable for SE or not, I hope you agree it is. Some time ago I asked on SE how to find text in files and leave the file with only the matching lines that ...
5
votes
4answers
1k views

How to append end of every line with the line itself

This is in file.txt: redcar bluecar greencar Im looking for ways to make it become: redcar redcar bluecar bluecar greencar greencar I've tried many ways using sed with no luck
5
votes
8answers
651 views

How do I delete the first n lines and last line of a file using shell commands?

I have a file named Element_query containing the result of a query : SQL> select count (*) from element; [Output of the query which I want to keep in my file] SQL> spool off; I want to ...
5
votes
6answers
517 views

split file into two parts, at a pattern

How to split a large file into two parts, at a pattern? Given an example file.txt: ABC EFG XYZ HIJ KNL I want to split this file at XYZ such that file1 contains lines up-to XYZ and rest of the ...
5
votes
5answers
454 views

How to replace a word with new line

I have a text file with following data and each row ends with |END|. T|somthing|something|END|T|something2|something2|END| I am tryig to replace |END| with \n new line with sed. sed ...
5
votes
5answers
1k views

Sed: extending a string of numbers to a certain number of digits by padding with zeros

I'm currently trying to modify an echoed string of alphanumeric characters by piping it to sed. The area I'm interested in modifying is a block of numbers, which I would like to make 8 characters long ...
5
votes
4answers
464 views

Remove next-to-last extension in a file name

Suppose a folder with many files with bad extensions,for example Song1.avi.mp3 Song2.avi.mp3 Song32.web.mp3 Song23.mp4.mp3 Song2a.mp9.mp3 I want to remove only the second field (web, avi, mp4). I ...
5
votes
4answers
486 views

Reduce the over use of files in text processing

Currently, I have a file (Results.txt) which has 27k rows. The file content is as below. 45008657 | A. | | Long | 0 49210987 | A. | ...
5
votes
3answers
706 views

Why does sed act differently depending on the output file?

If I run: cat messages.txt | sed -e 's/a/a/g' > messages.txt on one large file (2500+ lines) I find that the resulting file will only have about 900 lines after the command in cygwin and will ...
5
votes
7answers
1k 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 ...
5
votes
5answers
266 views

Converting long numbers to hex with sed

I'm trying to make a sed command so that numbers longer than 3 digits were converted to hex. I.e. a string like 124 3275 7535 should result in 124 0xccb 0x1d6f. Here's what I currently have: sed ...
5
votes
7answers
2k views

can we print the last word of each line in linux using sed command?

suppose , if there is a file consisting of following lines , if they are 12345 567 7878 66 er3 t45t y6y46y 4y6 y656y y5y 46y6 65y7 y66uyuy yy46y6y The output has to look like: 66 ...
5
votes
6answers
358 views

sed command to swap characters

My input file layout is: mm/dd/yyyy,hh:mm,other fields I need to format it as: yyyy-mm-dd hh:mm:00,other fields sample input: 01/02/1998,09:30,0.4571,0.4613,0.4529,0.4592,6042175 ...
5
votes
3answers
1k views

Deleting Lines if there is a dot in the 5th Column

I have a file and I want to remove all the line if it has a dot in the 5th Column. Input File: sc2/80 20 . A C 80 PASS N=2 F=5;U=4 sc2/60 ...
5
votes
6answers
28k views

Using sed to find and replace complex string (preferrably with regex)

I have a file with the following contents: <username><![CDATA[name]]></username> <password><![CDATA[password]]></password> ...
5
votes
3answers
14k 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, ...
5
votes
2answers
2k views

sed pattern space and hold space

i was just going thorugh this and i was unable to understand. sed -n '1h; 1!H; ${ g; s/foo\nbar/bla\nblub/ p }' file. where cat file is : foo foo bar why there is 1!H because to me 1h ...
5
votes
3answers
1k views

Insert text from file inline after matching pattern in another file

I'm trying to take the contents of a file and insert it after a matching pattern in another file using sed. My question is very similar to this question, but I wish to insert the contents of a file ...
5
votes
2answers
347 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 ...
5
votes
2answers
524 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 ...
5
votes
5answers
6k views

How to get all lines between first and last occurrences of patterns?

How can I trim a file (well input stream) so that I only get the lines ranging from the first occurrence of pattern foo to the last occurrence of pattern bar? For instance consider the following ...
5
votes
3answers
134 views

How to print a line if next line does not contain a particular string using nawk or sed

Input.txt: 8B0C remove 8B0D remove 8B0E remove 8B0F 8B10 remove 8B14 remove 8B15 remove 8B16 remove 8B17 remove 8AC0 ...
5
votes
2answers
379 views

sed + how to delete the second character “.” from the line

how to delete the second character "." from the line what I have is this ( but its remove the first "." from output uname -r | sed s'/\./ /' 2 6.18-164.2.1.el5PAE while I need the following ...
5
votes
4answers
491 views

extract lines according to a particular column

I have a CSV file like CK,ck XYZ,xyz,xyzs ABC,abc,abcs PQR,pqr,pqrs LMN,lmn, IJK,ijk, I have to check if something is written in column 3 except whitespace, then display the whole line.the output ...
5
votes
4answers
425 views

reverse order of paragraphs in file

I have a file containing text in paragraphs (lines with text separated by one or more empty lines). I would like to reverse the order of paragraphs (i.e. last paragraph will become the first, ...), ...
5
votes
4answers
657 views

sed how to substitute when string has “http://” in it?

I have a file xx that has the following contents: @base_url = "http://dmstaffing-stage.herokuapp.com/" I want to use sed to eliminate this line (replace with nothing). I have used this sed ...
5
votes
5answers
7k views

How can I convert tab delimited data to comma delimited data?

I'm requesting a list of ec2 snapshots via amazon's ec2 command line tool: ec2-describe-snapshots -H --hide-tags > snapshots.csv The data looks something like this: SnapshotId VolumeId ...
5
votes
4answers
235 views

How could I simplify this command to only use awk?

awk '/user/ {print $1 }' /etc/userdomains | sed 's/://' the format of /etc/userdomains is domain.tld: user otherdomain.tld: otheruser
5
votes
2answers
909 views

sed: read whole file into pattern space without failing on single-line input

Reading a whole file into pattern space is useful for substituting newlines, &c. and there are many instances advising the following: sed ':a;N;$!ba; [commands...]' However, it fails if the ...
5
votes
5answers
452 views

How to run a command only if sed replace strings

I want to enable multiverse repository in Ubuntu by a command line. sed -i "/^# deb.*multiverse/ s/^# //" /etc/apt/sources.list && apt-get update This command will run apt-get update every ...
5
votes
3answers
334 views

How can I replace a newline with sed?

I've got text with whitespace (including a newline) that I need to replace. I'd like to use sed, but AIX doesn't seem to support the answers to sed newline questions I found. The version of bash I'm ...
5
votes
4answers
6k views

Adding a line of text to multiple files

So, I have a bunch of files in a directory, and I need to insert a line of text into each of them. They have essentially the following format: <VirtualHost *:80> ServerAdmin ...
5
votes
4answers
722 views

Is there a difference between read, head -1, and sed 1q?

The following commands seem to be roughly equivalent: read varname varname=$(head -1) varname=$(sed 1q) One difference is that read is a shell builtin while head and sed aren't. Besides that, is ...