Sed stands for Stream EDitor - one of the basic tools in the POSIX environment. It processes one or more files according to an editing script and writes the results to standard output. Created in Bell Labs, it has been around since mid-70s.

learn more… | top users | synonyms

2
votes
1answer
2k views

replace text in file without overwriting file

I want to use the command line to edit a text file but not overwrite it. I want to preserve the owner, group, and permissions of the file. I have a file that holds a count of the number of times a ...
2
votes
2answers
1k views

How can I remove malware code in multiple files with sed?

I've this malware code in so many .html and .php files on the server. I need to remove them using sed -i expression search all files under directory /home/ find infected files remove the code by ...
1
vote
3answers
95 views

Taking this, and making that

I had no idea how to word the title. I need to take an output such as: [~]# cat file user1 domain1.com user2 domain2.com user3 domain3.com and turn it into an output such as: user1 domain1.com ...
3
votes
2answers
225 views

unix script problem

I have a simple script which runs on a FreeBSD machine with the following code: #!/bin/sh `sed -i .bak '\:#start 172.0.0.3:,\:#end 172.0.0.3:d' /usr/local/etc/racoon/racoon.conf` echo $? It should ...
5
votes
6answers
3k views

How to remove a tagged block of text in a file?

How can I remove all instances of tagged blocks of text in a file with sed, grep, or another program? If I have a file which contains: random text // START TEXT internal text // ...
3
votes
5answers
2k views

Is it worth while to learn Awk?

I am decent with bash scripting and I am catching on to regex, and a little sed usage. Is learning awk still worth while with all the alternatives out there. Opinions?
42
votes
9answers
109k views

How to display certain lines from a text file in Linux?

I guess everyone knows the useful Linux cmd line utilities head and tail. head allows you to print the first X lines of a file, tail does the same but prints the end of the file. What is a good ...
0
votes
1answer
847 views

Cannot cd to parent directory with cd dirname

I have made a bash command which generates a one liner for restarting all Weblogic ( 8,9,10) instances on a server. The script works well but I need a suggestion to make it better using the dirname ...
5
votes
2answers
248 views

Perl search & replace

How can I use search and replace to change the contents of a file. I need to be able to change the 'all to none' and/or 'none to all' without having to manually do it every time for hundreds of lines....
1
vote
2answers
377 views

sed to update xml file

I want to update <MySettingsSettings enabled="false" logFilePath="E:\server.log" /> to <MySettingsSettings enabled="true" logFilePath="D:\server.log" /> How can I do this through ...
1
vote
2answers
179 views

Wondering why sed isn't working with xargs like I expected

I am wondering why the following command wouldn't work: sudo find . -name index.htm | xargs -0 sudo sed -i 's/pattern1/pattern2/g' When ran the two commands separately, they worked as expected, ...
0
votes
2answers
465 views

Running (vertical?) diff on columns in a file

in our company we pull in inventory files from third parties. These files are in a fixed format, containing the 13-digit EAN (think UPC code) as well as other data. I also have a master list of EANs ...
0
votes
2answers
2k views

Extract 1 IP address from 2 or more in a line of text

I have about 30,000 Apache access logs, some of which list multiple client IP addresses. This is as a result of Apache logging the X-Forwarded-For header instead of the IP address of the client. The ...
2
votes
3answers
426 views

How to grab a word from a file using sed or grep

I am trying to pull a piece of text from a file to use as input for the next command. The word always starts with "JID_" and then some random numbers/characters after that. For example : ...
12
votes
4answers
4k views

read specified range of lines from a file

I have i file that contains 100000 line how i can get the lines from line# 5555 to line# 7777 under linux. Thanks for all.
3
votes
2answers
2k views

sed php.ini memory_limit

The following works great: phpmemory_limit=256M #or what ever you want it set to sed -i 's/memory_limit = 16M/memory_limit = '${phpmemory_limit}'/' /etc/php5/apache2/php.ini If the memory_limit is ...
0
votes
2answers
275 views

How can I echo changes made in a sed expression to the console?

I have a simple sed expression: sed -i 's/foo/bar/g' blat.xml Because the expression modifies the file in place it is hard to see which lines were changed. Is there a way to echo the modified ...
1
vote
5answers
3k views

bash script - print from line N to EOF

I want to be able to print the number of lines from bash as such: Line number (as counted from the top) -> end of the file It seems tail will only count lines from the bottom. Does anyone know how ...
0
votes
7answers
1k views

vi syntax to comment out non-commented lines (cron)

Anyone know if it's possible in vi to replace only uncommented/non-blank lines with comments? If I want to replace a commented line with something I know I can use :%s/^#/##foo##/g -- but I am ...
0
votes
6answers
3k views

How to recursively search and replace from command line on unix/linux system

So I want to change several files at one with one command. This is what I have so far: find -regex ".*\.ext$" | xargs grep -l searchText 2> /dev/null | xargs -i sed 's/searchText/replaceText/' >...
6
votes
3answers
14k views

How to get all running process ids only?

I know that ps ax returns the pids 1 ? Ss 0:01 /sbin/init 2 ? S< 0:00 [kthreadd] 3 ? S< 0:00 [migration/0] All I need is to clean those strings, but I ...
3
votes
2answers
2k views

How can I use grep to find the most frequently recurring errors in my log file?

I've got a PHP application that is generating large amounts of warnings and notices in the log file.. I'm fixing these one at a time. I would like to be able to fix the most frequently occurring ...
1
vote
3answers
3k views

SED Find & Replace w\ Regular Expressions

Alright, So i'm confused & out of ideas. I'm trying to replace all the old IP addresses with a new one. find -type f | grep \.php$ | xargs sed -r -i "s/(\'|\")(localhost|127.0.0.1|10.0.32.4|10.0....
2
votes
3answers
2k views

Getting correct linefeeds in emails generated from linux

I have a script that emails certain linux log entries to me, and I read the email in MS Outlook. The problem is that all the lines run together with no linefeeds between the lines. To address this I ...