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

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3
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3answers
174 views

sed syntax to remove 2 characters only when it is box and space

I have a sed expression to remove the first 2 characters from all the lines in a file. sed 's/^..//' raw.txt > converted.txt However, the problem is some lines are large and get appended to the ...
2
votes
1answer
104 views

Highlight today in Mac's cal

Every Mac comes with cal which shows a simple calendar of current month. Output is something like this: February 2014 Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
6
votes
2answers
227 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 ...
1
vote
1answer
910 views

Removal of extra spaces but not the newline from csv files

I have to compare 2 files by using comm command like the below comm -23 csv1 csv2 > csv3 I seem to face the problem that both the csv are generated from different sources (csv1 is extracted ...
5
votes
4answers
407 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, ...), ...
4
votes
4answers
2k 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
4answers
445 views

Count rows with specific integer in a column

I have 6 columns, each with multiple rows. I want to count the number of rows which have the integer 4 or 5 in the fifth column. A1 jhfj jdhfjkhd kdkfjjh 5 jhsdjkfh A2 ujhf jhdfhsd dsfkks 4 ...
2
votes
1answer
258 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 ...
0
votes
4answers
119 views

What are alternative tools for searching files in full content?

I realized that most of the text related tools I use, grep/egrep/awk/sed are line-oriented. I guess that is a simplified approach to search in files but I was wondering if there is another set of ...
6
votes
4answers
22k views

Can sed replace new line characters?

Is there an issue with sed and new line character? I have a file test.txt with the following contents aaaaa bbbbb ccccc ddddd The following does not work: sed -r -i 's/\n/,/g' test.txt ...
0
votes
1answer
41 views

Help on editing a script using grep and sed

First I'm new to unix so excuse my simple question, also be aware that I work on AIX. I have a lot of sql files that contains the following string: ${DB_USERNAME}.${TABLE_NAME} Can anyone please ...
1
vote
1answer
183 views

Insert a line after a block of text with sed

I have text file: file.conf ### Option: LogFile # Name of log file. # If not set, syslog is used. # # Mandatory: no # Default: # LogFile= ### Option: LogFileSize # Maximum size of ...
1
vote
1answer
313 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 ...
1
vote
1answer
209 views

pcregrep fails due to segmentation fault

I am extracting the HTML source of a web page using the below command. curl http://www.linkedin.com/pub/ramesh-venkataraman/63/621/b42 -s | w3m -dump -T text/html > foo.txt The foo.txt has the ...
1
vote
1answer
542 views

Sed: search and replace a patten with special characters which has a arbitrary string in between

I have a load of nfo files which I want to make some global substitutions for some values within each file e.g. a.nfo has the value <set>Tonight&apos;s Menu ( June 2012 )</set> ...
3
votes
4answers
7k views

extract only the substring after double quotes - grep

I have a file which is as below. <a href="http://firstlink.com" title="title1"> <a href="http://secondlink.com" title="title2"> <a href="http://thirdlink.com" title="title3"> <a ...
1
vote
2answers
124 views

bash replace part of string based on location [duplicate]

Sorry I've looked around for a one line solution ( as bash offers ) to replace part of filename. Given that a folder has image sequence like ve2_sq021_sc001_v000.0101.jpg ...
2
votes
2answers
179 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
796 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
449 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
107 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 ...
1
vote
2answers
663 views

Text substitution inside compressed files

I have several zip files, each one having several text files inside them. I want to substitute all occurrences of a in these text files with b, and leave them zipped with the same structure. If I ...
1
vote
3answers
143 views

sed or grep to get only the values without numbers

I have a file like below. 1. VMware ESX 2. SCCM 3. Healthcare Information Technology 4. vSphere 5. Citrix Metaframe 6. IT Service Management 7. ITIL 8. Active Directory 9. Project Portfolio ...
0
votes
4answers
972 views

Removing certain fields from a CSV file

I have a large CSV file (~15GB) which a client has sent over as an export of a table. The format is a follows: field, ... , field, field which sometimes contains commas, another field which sometimes ...
1
vote
2answers
231 views

Different behavior of sed with respect to an array and a string in the presence of backslashes

Let the file foo.txt contain foo\\ bar baz xx Why does the following correctly change "foo\\ bar" to "someotherstuff" in foo.txt? sed -i 's/foo\\\\ bar/someotherstuff/gI' foo.txt while this ...
2
votes
1answer
78 views

Does [[:space:]] work for sed patterns on all Linux distros?

Using [[:space:]] looks a little non-elegant and, quite frankly, Microsoft-ish for sed match patters. I was trying to extract "Last" out of "First Last" and either of the following worked: echo ...
1
vote
1answer
440 views

test recursive sed search and replace before running

Is there anyway to do a trial run of a recursive search and replace of sed before actually running it? I just want to print out the results before actually doing the search and replace. Something ...
3
votes
1answer
182 views

Reorder Multiple Line Blocks with Sed

I am trying to reorder generated output as follows; given a tex fragment as follows, I want to move the /^Constant/ down below /Dummies/, with the line before and after /^Constant/. Further, I would ...
1
vote
1answer
157 views

Shell script to list locked packages in FreeBSD

I'm trying to make a oneliner to be able to list all locked (forbidden to upgrade) packages in FreeBSD. Normally, you issue this command: pkg info -ak It outputs list of all packages in system ...
-2
votes
3answers
106 views

Deleting Lines, which match a particular Identifier from another file

I have 2 files. File 1, has an identifier (eg. D7MHBF:11:1449:1988) and every new entry starts with @. It has few more fields, which are not important in our analysis. File 2 consists of a column of ...
64
votes
2answers
112k 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 ...
0
votes
3answers
791 views

Awk/grep/sed get comma separated list of numbers from lines of text

I have a log file that has lines that look like this: blah blah blah Photo for (702049679 - blah blah blah Now I know I could get all the lines like that from the file by doing: grep "Photo for" ...
0
votes
3answers
158 views

grep for string like xxx12345

I have 64 processes running that have the following string pbs_mom -m -M 1234 -R 5678 -A foo12345 -c /var/spool/torque/mom_priv/login_config I need to search and extract just foo12345 always ...
1
vote
1answer
930 views

AIX's sed - in place editing

Is there any non-documented flag on AIX's sed implementation that allows in place editing? The man page shows no flag to this operation, which is one of the most usefull ones in other UNIX flavours.
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 ...
1
vote
7answers
5k views

Sed / Awk - Find string exactly n characters long

Looking through the man pages for sed, awk and grep, I'm unable to find a way to search for a string that is exactly n characters long. Given the following text file, I want to extract just ...
2
votes
3answers
87 views

Sed - string substitution with groupings

I have a largish directory with filenames formatted like Some_Folder-(FOL001)-clean what I'm trying to do is display the pattern between the brackets at the start like FOL001 ...
2
votes
3answers
254 views

Free BSD/ Mac OS X Sed: Print regex match and the line 5 lines after the match

I thought it would be sed -n /mymatch/,+5p but I get expected context address. At this point I am just guessing commands, nothing works! I want to grab every line that matches the regex and print ...
0
votes
3answers
116 views

Replacing multiline consecutive tags with a single line using sed and ignoring white spaces

I have a large XML file with several tags. One of the sub tag is as below: <Products> <SubProduct> ----> this line is problem <SubProduct> ...
1
vote
3answers
3k views

Remove whitespace and parentheses in filenames with sed [duplicate]

I'm an absolute newbie in the unix area so forgive me off the bat if I've gone about this the wrong way. I have a series of files I need to rename which all have the pattern " (*)" in them. Eg; ...
0
votes
2answers
90 views

Turning percentages into decimals?

I've got a CSV file that has percentages here and there expressed in text format, e.g. 173.91,0.00%,36.10%,1.71 Question of the day is how do I turn that example into 173.91,0,0.3610,1.71 Edit ...
3
votes
1answer
137 views

Can someone clarify this Bash script

I'm learning something about Bash scripting, and I came across this example: The task is to write a Bash script that reads a file, given with the first argument, pulls out those records that have the ...
4
votes
2answers
123 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
2answers
1k views

Escaping blackslash in sed

I am trying to write a sed command to replace a line in a file. The sed replace required the current working directory, which starts making the command a bit messy because of the characters that need ...
4
votes
2answers
150 views

Cut a string- Catch: There is file with same name as string in the same path

Input /in/archive/ABC/20140111_ABC_018_PART_001.dat Desired Output: 20140111_ABC_018_PART_001.dat Command used: cut -d/ -f4 "/1a/ftproot/archive/ABC/20140111_PR1_018_SALESDOC_ITEM_001.dat" ...
0
votes
2answers
416 views

Print 2nd and 7th lines to a file using `sed`

I have a directory of .txt files. For each, i'd like to grab the 2nd and 7th line, and add those lines to another file, which I've arbitrarily named list.index. I'm not sure how to tell sed about the ...
1
vote
3answers
139 views

Extracting n characters from a test line

How can I extract the 6 characters after Z in the following text line and put it into a file using grep, egrep, sed or awk? ...
1
vote
1answer
176 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" ...
1
vote
1answer
334 views

Processing FreeBSD's PF logs with tcpdump/sed/awk

I'm running FreeBSD and have PF firewall set up and this is command i use to display daily number of firewall hits (blocked traffic) sudo tcpdump -n -e -tttt -r /var/log/pflog | grep $(date ...
1
vote
2answers
2k views

Printing and deleting the first line of a file using `sed`

I can print the first line of a file using sed -n 1p file.txt I can delete the first line of a file using sed -i 1d file.txt Is there a way to print-and-delete in sed? Kind of like a FIFO pop() ...