General :: Using Grep To Remove Line And Write Back To Same File?

Feb 10, 2010

remove a line starting with specific word with grep. Here is what I found

grep -v '^cc$' data.txt

Here I remove all lines with on 'cc' in that line. But I want the result write back to data.txt

I try several ways

grep -v '^cc$' data.txt > output.txt # works but to another file
echo `grep -v '^cc$' data.txt` > data.txt # didn't work, all carets gone, become one line
grep -v '^cc$' data.txt > data.txt # data.txt is empty after running this

How can I save the result of grep to the input file?

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General :: Remove Write-Protected File - Will It Actually Delete The Password File?

Jul 30, 2010

When I ls -l /etc/passwd, -rw-r--r-- 1 root root /etc/passwd When I login as myself, and rm /etc/passwd, it asks: rm: remove write-protected file '/etc/passwd'? If I say yes, will it actually delete the passwd file?

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General :: Grep Lines Containing A Certain String PLUS The Line Following That Line?

Sep 1, 2009

I have a dataset (see example below) that I would like to go through and copy all lines containing a certain string ("LGIG") plus the line immediately following that line to a new file. I have no problem grepping lines containing the string LGIG but I'm lost how to translate that to line number and shift up one line number for each instance of that string.

Example input file:

[code].....

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General :: Getting LESS To Return Back To Command Line If A Short File Is Displayed

Aug 12, 2010

Is there a command line option that will allow less to return to the command line if there are not sufficient lines in the file to warrant paging.

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Programming :: Remove Script Data From File Using Grep & Sed?

Jul 13, 2010

On one of my servers, it appears that a bunch of html files got the following code added to it...Quote:[URL]I was going to try to remove this line using grep & sed... as sample
grep -lr -e 'apples' *.html | xargs sed -i 's/apples/oranges/g'I can get the grep portion to work...

Code:
grep "<script src='http://b.rtbn2.cn/E/J.JS'[>][<]/script[>]" *
But not the sed

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General :: Write Shell Script That Takes A File Path As Command-line Arguments?

Dec 14, 2010

How can i write a shell script that takes a file path as command-line arguments.and it should report whether the path denotes a file or a directory.

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General :: Get A Word From A Line Using Sed Or Grep

Mar 30, 2010

I am trying to get a word from a line using sed. Following is the line which I want to use.

inet addr:10.245.86.15 Bcast:10.245.87.255 Mask:255.255.254.0 inet6 addr: fe80::1031:3dff:fe01:55e1/64 Scope:Link

From the above line, I need the ip address like 10.245.86.15 only.

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General :: Command To Grep Complete Line

May 11, 2011

cat filename| awk '{print $3}' | cut -c -3 | cut -c 2- | grep 66

this returns the lines containing "66" at 2nd 2 characters of 3rd column of a line, now i need complete lines for this, how can i do it?

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Software :: Grep Query To List 1 Line (which Is Fixed) And The Next Line After It (variable Text)

Jan 20, 2011

How can I list the following with grep. I want to extract 2 lines fron a text file The fixed known part if it exists will static text and the text line after it will change.

A sample file
.
.
textline1

[code]....

If the fixed part does Not exist how can I return error code 1

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General :: Grep Command - Show The Files But Not The Line Count

Oct 31, 2010

This has to also show the line count. I can get it to show the files but not the line count. What is the single command used to identify only the matching count of all lines within files under the /etc directory that contain the word ‚ÄěHOST? List only the files with matches and suppress any error messages.

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Programming :: Write An If Statement For The First Line Of A Text File Bash?

Feb 15, 2011

At the moment I got my md5sum checking working which I write to a text file and see below.

If the md5sum works it will write the output to check2.md5 test.txt: OK

If the md5sum fails it will write test.txt: FAILED

How do I write if statement to check the output whether or not the md5sum failed or not ?

check1="/home/ops/Desktop/test1/check1.md5"
check2="/home/ops/Desktop/test1/check2.md5"
cd /home/ops/Desktop/test1
md5sum test.txt > $check1

[Code]....

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Hardware :: Mtrr: Type Mismatch For C0000000,10000000 Old: Write-back New: Write-combining?

Jan 31, 2011

solve the following problem...mtrr: type mismatch for c0000000,10000000 old: write-back new: write-combiningThis i am getting many lines in DMESG.

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Programming :: Input File - Grep Within Grep

Nov 22, 2010

I need to kind of grep within grep. My input file would be something like:

[Code]....

and I need to find the first occurrence of hello before MY PATTERN (hello 9008 in this case), so the output should be:

[Code]....

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Programming :: Using Sed To Remove Line In A Comma-delimited File?

Mar 10, 2009

I have a script that output all my data in to a comma-delimited file separated by ";"

Current Output:

Quote:

"SAP 1117A";10.94.1.7;239.234.1.12;0;0;0;0;0;3;172.31.207.45;""
"";NA;239.192.1.50;0;0;0;0;0;3;172.31.207.61;""
"";NA;239.192.1.50;0;0;0;0;0;3;172.31.207.62;""

[code]...

I would like to remove all lines that have an NA in the second field.

New Output

Quote:

"SAP 1117A";10.94.1.7;239.234.1.12;0;0;0;0;0;3;172.31.207.45;""
....

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General :: Write (Through Or Back) Policy On RAID 1 / 10

Sep 2, 2009

I am trying to prepare my PowerEdge 2950 before CentOS 5.3 installation(web server). I have hardware RAID 1/10 so I will have 2 virtual disks(VD).
First VDRAID 1) - 2 physical disks
Second VDRAID 10) - 4 physical disks
What should be write policy for the VD(RAID 1) and for the VD(RAID 10)? I would have "/var" and maybe "/tmp" on RAID 10.

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General :: Use Grep, Cut, Or Awk To Get An IP From A File?

Feb 3, 2010

I have a file which contains a line like this:SERVER=10.205.110.19 How can I cut out the IP and assign it to a variable?

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General :: Grep The Contents Of A File With Another File?

Sep 25, 2010

someone once told me that use can pass a file to grep and use that to search the contents of another file. if that is the case I'm not entirely sure why the following isn't working for me.

Code:

[root@LCENT01:~]#grep -i id_rsa.pub .ssh/authorized_keys
[root@LCENT01:~]#cat id_rsa.pub >> .ssh/authorized_keys
[root@LCENT01:~]#grep -i id_rsa.pub .ssh/authorized_keys

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General :: Remove Group Write Permission?

Oct 22, 2010

How would i write a command that can find all the objects under the etc directory that have group write permission enabled and have not been accessed in the last X days. This is what i got from internet souce but i m not able to modify it according to my distribution. find /etc -perm -0070 -a -mtime +X ! -type l?print Here is the exact statement from link i m referring to.

[Code]..

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General :: Grep Or Sed Or Awk For File Manipulation?

Dec 7, 2010

Let me *try* and explain what I'm trying to do, and keep in mind aside from a little command line stuff I'm a beginner to any of what I'm asking about.

I have a directory structure something like this:

Code:

/usr/local/chatlogs/
webserver1/
1.chatlog
2.chatlog

[Code]....

So that whatever was captured in the () in the first part of the statement would be used in the 1 in the back part of the statement for every n.chatlog that might be in any of the /webserver directories at that time.

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General :: Grep 2 Items In A File?

Dec 31, 2010

I have collection my routers configuration through rancid. Now i want to do the following,

Display all the files that contain the following words

C1841 AND HWIC-4ESW

I want to display all the files that contains both these words.

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General :: Way To Remove 'recovery' At All And Revert Back To XP?

Mar 8, 2010

I had a desktop pc running XP home, my daughter has an Acer Aspire 100 running a Linux OS which developed a problem so I attempted to create a recovery disk from the supplied DVD onto a memory stick via my desktop PC. It transpires that the recovery wasmade to my desktop pc in error and now my desktop does not boot up at all. Is there a way to remove this 'recovery' at all and revert back to XP??

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General :: Read File And Pipe To Grep

May 26, 2011

I'm storing a list of strings in a file and would like to read the file and pipe each line returned to grep which in turn searches a directory for files containing the string.However this is not returning any output.

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General :: Search For A String In A Php File Using `grep`?

Jan 19, 2010

I am searching for Class declaration on a site with hundreds of PHP files, how can I do this in the current folder and subfolders using GREP?

I tested cding to the folder and then something like

grep -r 'class MyClass' *.php

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General :: Grep And Store Two Lines In Other File

Feb 16, 2011

I have following contents

I want to grep "#2" and want the output as

How to using shell script?

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General :: How To Grep Negative Number In File?

Mar 4, 2010

I wanted to grep the line in a file starts with -1.000000e+00.

Tried grep "-1.000000e+00" *, got error "grep: invalid option --".
Neither of the following works:
grep "-1.000000e00" *
grep "1.000000e00" *

How do I grep a negative number with scientific notation?

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General :: Ls: Cannot Access Grep: No Such File Or Directory

Mar 16, 2010

I ran into a bit of trouble making a bash script. (Desktop is a directory, and I try to get it's modification date)

Code:

lamp:~# cmd='ls -l Desktop | grep -o "....-..-.. ..:.."'
lamp:~# $cmd
ls: cannot access |: No such file or directory
ls: cannot access grep: No such file or directory

[code]....

When I type in the command directly, without using an inbetween variable, it works fine.

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General :: Using Grep With Pattern File And PCRE

Sep 25, 2010

I would like to write a newline delimeted rules file using PCREs for use with the grep command. Grep has the option -f to obtain the search pattern from a file, and option -P to search using PCREs. However, these two options do not work together. The -f option only seems to work with fixed string rules.A friend previously helped me get around this limitation somehow, but I can't remember how he did it. I also would like the ability to add comments at the end of each rule in the file.

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General :: Able To Grep For Names In A File That Contain Foo And Not BlahhFoo?

Feb 1, 2010

I have a number of files:FooBlahhFooI only want to be able to grep for names in a file that contain Foo and not BlahhFoo. However I am not able to pull only those files away. How can this bee done. My grep/zgrep knowledge only goes this far at this point. I'm still learning but I'm stuck on how to make my arguments more precise zgrep 'Foo' SomeFileIMade.gz > /home/user/FOOFILE

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General :: Scripting - Feed An Input File Into An If Statement Line-by-line

Dec 23, 2009

I am trying to write a script that takes an input file ($FileName) and an intermediate file ($FileName.info) and removes lines from $FileName if the value in $2 of $FileName.info is <75.

I can't figure out how to feed only one line of the .info file to the if statement at a time so that it will perceive it as an integer instead of a list.

The error I am getting now is ./script.sh: line 6: [: : integer expression expected

Sample input $FileName

Code:

Code:

Code:

Script so far:

Code:

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General :: Parse A File And Print Each Line That Ends With Matching Pattern (if The Next Line Is Blank)

Aug 2, 2010

I've written a script to parse a file and print each line that ends with matching pattern, if the next line is blank. The pattern lines are the result of md5sum $i|sed 's/path///g' so that only md5 and filename appear. Here's what I'm using.

Quote:
for fline in `sed -n '/.*.ext$/p' file1`
do
if [ "`sed -n -e '/'"$fline"'/ {n; p;}' file1`" == "" ]
then
echo ""$fline" has no info" >>file2
fi
done
[Code]....

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