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

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8
votes
5answers
5k views

How to remove multiple blank lines from a file?

I have some text-files I use to take notes in - just plain text, usually just using cat >> file. Occasionally I use a blank line or two (just return - the new-line character) to specify a new ...
2
votes
1answer
35 views

How to avoid sed -i to destroy symlink?

Why does sed -i executed on symlink destroys that link and replaces it with destination file? How to avoid this? eg. $ ls -l pet* -rw-rw-r-- 1 madneon madneon 4 mar 23 16:46 pet lrwxrwxrwx 1 madneon ...
1
vote
2answers
44 views

How to list only the last line of each directory?

I learned thanks to you, how to display only the last line of a listing,e.g. ls -ltr | sed '$!d' Now I thought, how to combine it with the find command, in order to repeat this onto each directory ...
0
votes
3answers
35 views

How to display only the last line of a listing ?

Supposed I make a listing and sort the files by its temporal attribute: ls -ltr -rwxrwxrwx 1 bla bla 4096 Feb 01 20:10 foo1 -rwxrwxrwx 1 bla bla 4096 Feb 01 20:12 foo2 . . . -rwxrwxrwx 1 bla bla ...
0
votes
2answers
65 views

How to delete specific lines within a certain area?

I want to delete some specific lines in the YAML front matter: --- Author: aaaa Title: bbbb Time: cccc Place: dddd ... Lets say I wanted to delete only the lines in the front matter that contained ...
0
votes
0answers
24 views

Would this command delete only the lines containing specific words within a delimited area? [duplicate]

Please see my previous question here. No one seems to be following up on it, so I have tried to have a go myself: sed '1 { /^---/ { :a N; /\n---/! ba; /^Title: \|^Place: /d} }' filename Would this ...
0
votes
0answers
48 views

Replace a string with another string in a text file [on hold]

I want to replace a string that is in the file file1 with another string. I tried sed -i -e "s/chaines1/chaine2/g" file1 but the problem is I can't pass the two strings on the command line ...
2
votes
2answers
56 views

Live replacement, while viewing log using LESS

It's very convenient to monitor logs using less command - you see what is going with your system as it happening. The bad thing is that my logs are optimized for grep tool: each atomic action is ...
1
vote
1answer
42 views

Write text on last line of document [duplicate]

If I have this document aaa bbb ccc And I want to add " ddd" on the last line. My document should look like this: aaa bbb ccc ddd How can I do this? If I prefer awk or sed but ...
1
vote
2answers
42 views

Remove paragraph from file

I have a file (file.php) like this: ... Match user foo ChrootDirectory /NAS/foo.info/ ForceCommand internal-sftp AllowTcpForwarding no GatewayPorts no ...
0
votes
1answer
31 views

Sed a plist file gives a iilegal byte sequence

With a Unix Mac 10.9.5, French CA version I've read a lot of tips but if the error is gone, the plist is corrupted. the locale command gives: LANG="fr_CA" LC_COLLATE="fr_CA" LC_CTYPE="fr_CA.UTF-8" ...
8
votes
2answers
15k views

How to replace a string with a string containing slash with sed?

i am looking for a way to replace a string in a file with a string that contains a slash by using sed. connect="192.168.100.61/foo" srcText="foo.bar=XPLACEHOLDERX" echo $srcText | sed ...
35
votes
6answers
45k views

How can I use sed to replace a multi-line string?

I've noticed that, if I add \n to a patter for a substitute using sed, it does not match. Example: $ cat > alpha.txt This is a test Please do not be alarmed $ sed -i'.original' 's/a test\nPlease ...
2
votes
1answer
29 views

sed match pattern and act on x lines after

I'm trying to find a way to comment out a block (multiple lines) in a configuration file. I'd like to match the first line but also act on each line after that. sed '/\/Some\/Foo\/Bar\/String/' ...
7
votes
10answers
4k views

Decoding URL encoding (percent encoding)

I want to decode URL encoding, is there any built-in tool for doing this or could anyone provide me with a sed code that will do this? I did search a bit through unix.stackexchange.com and on the ...
6
votes
3answers
2k views

Cleanly swap all occurences of two strings using sed

Suppose I have a file that contains multiple occurrences of both StringA and StringB. I want to replace all occurrences of StringA with StringB, and (simultaneously) all occurrences of StringB with ...
49
votes
2answers
88k views

How can I replace a string in a file(s)?

Replacing strings in files based on certain search criteria is a very common task. How can I replace string foo with bar in all files in the current directory? do the same recursively for sub ...
10
votes
3answers
5k views

How to sort the string which combined with string + numeric using bash script?

This is the data what I want to sort. But sort treats the numeric to string, the data it no sorted as I expected. /home/files/profile1 /home/files/profile10 /home/files/profile11 ...
1
vote
2answers
48 views

Sed move line from n° 40 to 39 position [duplicate]

I have a text file,of 100 lines,i need to move line 40 to line 39(refer to position) How to do this with sed? I tried sed '40 m 39' file and sed '40,39m' file but give me error. Thanks
2
votes
6answers
13k views

Extract a part of one line from a file with sed

I want to read one part of one line from a file. For example: POP3_SERVER_NAME = localhost I want to return only localhost, using sed. This text is on the third line. I do this to extract the ...
1
vote
4answers
111 views

SED command to format text file

I need to create a SED command to modify an input file with some conditions explained below. I have an input file something like below. List item Rad# ; ID_KEY ; UNIT_ID 1 ; 30000000004 ; 8417920 ...
13
votes
2answers
52k views

Return only the portion of a line after a matching pattern

So pulling open a file with cat and then using grep to get matching lines only gets me so far when I am working with the particular log set that I am dealing with. It need a way to match lines to a ...
0
votes
2answers
44 views

sed command to replace a string from one file with entire contents of another file [duplicate]

I want to write a sed (or awk) command to replace a string from one file with the entire contents of another file. Note that second file from which I want to get the content has more than one line. I ...
2
votes
1answer
34 views

sed - perform multiple substitutions on a line found by pattern search?

I have a file which contains a like like this: name=MOD0 and a lot of extra lines which I'm not interested in. I need to transform this line into this: [MOD0] and drop all other lines from the ...
0
votes
2answers
20 views

Replace a range of text with special characters using sed

I am trying to replace a range of text with sed containing special characters. I have the following output: "Users" "/Users/Users" SERVER1 "Roaming Profiles" "/Roaming Profiles/Roaming Profiles" ...
3
votes
1answer
78 views

how to change the replacement of word in the specific line using sed command?

I have to change a word in the 4th line so I used this command: sed -i '4 s/previous_word/new_word/' filename and it worked perfectly. But if I save the line number in a variable and try the same ...
2
votes
5answers
164 views

sed, find and place after and before

I have massive text with different dates and hours so i cannot use it as pattern and i was thinking if it's possible to search for 1st , and AFTER it print " & search for 2nd , and BEFORE it print ...
2
votes
2answers
59 views

Using the sed command in Unix

how do you take one word from a file and change it to an absolute path? Basically I need to take one word from a unix file and change it to a absolute directory path in that file. The file name is ...
1
vote
3answers
121 views

how to delete line from the XML file

how to delete only the line from xml file ( with sed/awk or perl one liner line ) that start with: <units> and ended with </Networks> as the follwoing <units><unit ip= ...
2
votes
2answers
192 views

Strip #xxx comments except when they occur inside quotes in sed

How to solve the following problem? Input hai this is "#test" #this is comment Question: How to remove only the comment in shell script. Expected output: hai this is "#test"
2
votes
2answers
40 views

SED on Mac OS X

I'm using a MacBook Pro and I want to find and replace a given word with another with sed command, but it makes no changes. What is the problem? sed 's/\<cat\>/dog/g' tt.txt
2
votes
1answer
56 views

Expanding paths in Bash variables into sed expressions

I would like to ask what's wrong with this line? sed -i "/$PWD/a\ Hello World" historia.txt when I had it in this '' except for "" it was working, of course without expanded variable.
6
votes
4answers
9k views

Use sed to find whole word and replace

I have the following block of text in a file: test3.legacy test4.legacy test3 test3.kami I only want to search for test3 as a whole and replace it with nothing. Unfortunately, all my attempts have ...
1
vote
2answers
44 views

Swap line containing pattern with next line

I currently have the following code which nicely outputs some information about the wireless networks around me: sudo iw wlan0 scan | sed -nr '/SSID: |signal: |primary channel: /p' | sed ...
0
votes
1answer
34 views

effect of [0-9]* in a regular expression

What is the function of [0-9]* in the following statement, which will write all lines that start with an even number, followed by a space, to the file even: sed -n 's/^[0-9]*[02468] /&/w even' ...
1
vote
1answer
52 views

Problem with sed substition in multi-word regex

Take this simple example: echo "20150310 21:12:01.846338::: <?xml version="1.0"?><Haystack><Event " \ | sed 's/^\(.\{24\}\)::: \(<?xml.*><Haystack\|Foo\)>\(.*\)/\2 ...
4
votes
2answers
79 views

Replace string in a file with another where both are saved in variables

I want to replace a string found in a file with another string, but both have a special character (in this example it is a . char) e.g 1.0 and 2.0. So this is the command currently used: sed -i ...
1
vote
1answer
33 views

Replace a string in a text file using a shell script not working properly

I have a text file containing this: 0 0 -1 0 1 0 0 0 0 -1 0 0 1.5 0.0 1.0 1 and I want to replace the 1.0 to 2.0 so that it becomes: 0 0 -1 0 1 0 0 0 0 -1 0 0 1.5 0.0 2.0 1 so I use this ...
3
votes
3answers
36 views

Using sed to remove string or paragraph between delimiter

I would like to know who to remove a string or paragraph that are between ((( string ))) Lorem ipsum (((dolor sit amet))), consectetur adipiscing elit. Vestibulum aliquet fringilla est, dictum ...
1
vote
4answers
124 views

How to insert a variable in a variable in a random place?

Q: How can I insert variable $b to a truly random place in variable $a? Example INPUT variable content: $ echo $a árvíztűrő tükörfúrógép $ echo $b ZZ OUTPUT $ ./somemagicscript.sh árvíztűrő ...
0
votes
1answer
23 views

Multi line substitution duplicating across lines in OSX

I'm a little rusty in my sed and haven't used it much since moving to a Mac but I am aware there seems to be a difference with what sed is used on a Mac per Ubuntu after a few searches. What I am ...
2
votes
5answers
178 views

How to reverse the lines between a pattern into another file

I have the following in the input file #Start para 0 hello dq 1 world dq 2 welcomes dq 3 you dq #Start para 0 how tq 1 are tq 2 you tq #Start para 0 say dq 1 hello dq 2 to dq 3 the dq 4 world dq I ...
1
vote
2answers
37 views

How do I update the dates (by 30 days) in the files going to that specific location in unix?

How do I update the dates (by 30 days) in the files going to that specific location in unix? Can awk or sed help ? File format is as below - Thomson: xyz Format: 1 Character_set: ASCII8 File_type: ...
2
votes
4answers
89 views

How to highlight given string in given place?

How can we modify this: <a href="http://foo.bar1">asfdlksafbar1qsasadf</a><br> <a href="http://foo.bar2">svasfbar2saldkfj</a><br> <a ...
1
vote
3answers
202 views

A sort of reversed cat [closed]

I've two documents that are the result of SQL Queries. For exemple i've my Doc1.lst that is : John1 0 Julien 10 Jules3 0 Julie 30 On this Doc1.lst, I used sed to have only ...
1
vote
3answers
41 views

How to do find and replace in one field based on the value in the other field?

I have a file like this. IMS00|20140101|Unix|Jan14 IMS01|20140201|Unix|Feb14 IMS02|20140301|Unix|Mar14 IMS03|20140101|Unix|Jan14 IMS04|20140201|Unix|Feb14 My criteria are, if the column 1 value is ...
3
votes
2answers
159 views

sed command doesn't return what I want

My document doc.lst is compound with numbers and letters like this : 01 ABC and I want to take only the "ABC" part. I tried this, but it includes the numbers in my result.lst. sed -n -e ...
2
votes
5answers
691 views

Print the string between two parentheses

I have file with these lines G8 = P(G1,G3) G9 = P(G3,G4) G12 = P(G2,G9) G15 = P(G9,G5) G16 = P(G8,G12) G17 = P(G12,G15) I need the output as G1,G3 G3,G4 ..... How can I do it with sed/grep ...
0
votes
0answers
42 views

SED: print entire paragraph for specific pattern while loop

I find partial answer about my problem on this question but i still have trouble. I need to use a variable as a pattern for the sed command in a loop sed -e '/./{H;$!d;}' -e 'x;/'$var'/!d;' The ...
2
votes
1answer
26 views

Match and delete lines with ~100 strings

I have a list of roughly 100 entries to be deleted from a csv-delimited file. They are already in another text file called 'tbd.txt; My first thought is to write a bash for loop around 'sed -i' but ...