Sed is a command-line stream editor for filtering and transforming text.
9
votes
6answers
916 views
How can I prepend a tag to the beginning of several files?
I need to add PHP tags surrounding a file. It's easy to append them using
find . -exec echo "?>" >> '{}' \;
but how can I prepend the tag <?php?
5
votes
1answer
3k views
Extracting a regex matched with 'sed' without printing the surrounding characters
To all the 'sed' doctors out there:
I have a seemingly trivial 'sed' question to which I have not been able to find
a solution.
How can you get 'sed' to exctract a regular expression it has matched ...
4
votes
4answers
693 views
Text between two tags
I wanna retrieve whatever is between these two tags – <tr> </tr> – from an html doc.
Now I don't have any specific html requirements that would warrant for an html parser. I just plain ...
10
votes
4answers
10k views
How to manipulate a CSV file with sed or awk?
How can I do the following to a CSV file using sed or awk?
Delete a column
Duplicate a column
Move a column
I have a big table with over 200 rows, and I'm not that familiar with sed.
3
votes
3answers
798 views
Show lines matching a pattern and the 4 lines before each
For example, from this file:
CREATE SYNONYM I801XS07 FOR I8010.I801XT07
*
ERROR at line 1:
ORA-00955: name is already used by an existing object
CREATE SYNONYM I801XS07 FOR ...
7
votes
5answers
2k views
Remove comma between the quotes only in a comma delimited file
I have a input file delimited with commas (,). There are some fields enclosed in double quotes that are having a comma in them. Here is the sample row
123,"ABC, DEV 23",345,534.202,NAME
I need to ...
4
votes
3answers
306 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 ...
2
votes
2answers
1k views
Show only text between 2 matching pattern
I'm going to submit form using cURL, where some of the contents is come from other file, selected using sed
If param1 is line matching pattern from other file using sed, below command will works ...
6
votes
3answers
651 views
Replacing Multiple blank lines with a single blank line in vim / sed
Question more or less says it all. I'm aware that /^$/d will remove all blank lines, but I can't see how to say 'replace two or more blank lines with a single blank line'
Any ideas?
5
votes
1answer
5k 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 ...
4
votes
3answers
248 views
Delete the matching line and several more from a file
I have a text file called file_a.txt.
My first command is
grep -A 12 ".production =" file_a.txt
The output is a few block.
Each block of string contains 13 rows
I specifically want to delete all ...
3
votes
2answers
507 views
Insert a multiline string into another string
I need to insert lines into an xml file :
Insert
<one>
</one>
into
<tags>
</tags>
To obtain
<tags>
<one>
</one>
</tags>
I tried this:
...
3
votes
3answers
614 views
Inserting text at the beginning of a file with sed via the terminal in Linux [duplicate]
Possible Duplicate:
How can I prepend a tag to the beginning of several files?
How do I insert text at the beginning of a file via terminal?
3
votes
2answers
3k views
sed one-liner to delete everything between a pair of brackets?
I am working with some text that is full of stuff between brackets [] that I don't want. Since I can delete the brackets myself, I don't need the one-liner to do that for me, but I do need a one-liner ...
1
vote
4answers
335 views
Replace text between brackets
I'm using awk '{ gsub(/BAR|WIBBLE/, "FOO"); print }' to replace text in data like:
SOMETHING [BAR, WIBBLE]
SOMETHING [BAR]
This gives the desired result of:
SOMETHING [FOO, FOO]
SOMETHING [FOO]
...
8
votes
4answers
2k views
Efficient in-place header removing for large files using sed?
The commands below may takes minutes depends on the file size. Is there any more effient method?
sed -i 1d large_file
12
votes
9answers
1k views
There must be a better way to replace single newlines only?
I am in the habit of writing one line per sentence because I typically compile things to LaTex, or am writing in some other format where line breaks get ignored. I use a blank line to indicate the ...
8
votes
3answers
2k views
Zero-fill numbers to 2 digits with sed
Input:
201103 1 /mnt/hdd/PUB/SOMETHING
201102 7 /mnt/hdd/PUB/SOMETH ING
201103 11 /mnt/hdd/PUB/SO METHING
201104 3 /mnt/hdd/PUB/SOMET HING
201106 1 /mnt/hdd/PUB/SOMETHI NG
Desired output:
201103 ...
5
votes
1answer
1k views
Differences between sed on Mac OSX and other “standard” sed?
I am having some issues in using an answer provided on this site for this question about a sed command to replace a blank line with two other lines of content, and it was brought up if the sed command ...
1
vote
3answers
312 views
Switch from grep to sed
I have a files students.txt, with lines of the form:
Surname, Forename: Day.Month.Year: Degree
For example:
Smith, John: 15.01.1986: MSc IT
Taylor, Susan: 04.05.1987: MSc IT
Thomas, Steve: ...
7
votes
1answer
236 views
Change date “July 29th, 2011” to “20110729”
I have lots of HTML files contains date with format July 29th, 2011
I want to change date format July 29th, 2011 to 20110729, December 9th, 2010 to 20101209, etc.
I think sed may works but still ...
5
votes
2answers
228 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 ...
3
votes
2answers
342 views
What is the best way to find a list of several strings within a large text file
The short, general question is: In Unix/Linux, what is the best way to find a list of several (about 150) strings within a large text file?
I am asking this to all Unix/Linux experts as a general ...
3
votes
2answers
286 views
How to skip file in sed if it contains regex?
I currently use the following simplified command to remove trailing whitespace and add a newline at end of file where needed:
find . -type f -exec sed -i -e 's/[ \t]\+\(\r\?\)$/\1/;$a\' {} \+
As ...
2
votes
2answers
183 views
Piping paths with different types of quotes for slash substitution
I would like to use sed to convert a path with backslashes to the same path with forward slashes:
E.g.
I would like to pipe \\path\to\file\ and obtain /path/to/file
None of the following commands ...
2
votes
1answer
941 views
Delete last character in a word but only if the character is there - in bash
How to remove last character only if it's there?
input:
OpenOffice.org/m
openOffice.org/ozm
Pers.
Pfg.
phil.
Prof.
resp.
Roonstr./m
roonstr./ozm
desired output:
OpenOffice.org
openOffice.org
...
1
vote
2answers
2k views
sed command to replace a blank line with two lines of content
How do I replace the first blank line with two lines of content? I did see a question on replacing multiple blank lines with a single blank line in vim sed but don't quite see how to adapt that. So, ...
0
votes
3answers
505 views
What is the purpose of -e in sed command?
I can't find any documentation about the sed -e switch, for simple replace, do I need it?
e.g.
sed 's/foo/bar/'
VS
sed -e 's/foo/bar/'
-6
votes
5answers
239 views
Manipulating a file with sed
I have a file called students.txt and it contains the following data in the format Surname, Forename: day.month.year: Degree:
Smith, John: 15.01.1986: MSc IT
Taylor, Susan: 04.05.1987: MSc IT
...
