Fedora :: Using Sed To Manipulate A Line In A File?
Nov 16, 2009
My latest rpm package building project is a ham radio program called rmsgw. The source code tarball is a "make" and "make install" affair. It's Debian style Linux format fails badly on a Fedora install, so some tweaking of a configuration file is needed.I presume sed is the right tool for this job. I have no experience with sed and I don't want to spend a week or more in 'info sed' and doing endless trial and error if I can avoid it. I need to change one line in a text file named rmsgw.mk with a command(s) in the spec file.The original line:
Code:
PKG_LIBS := -lwl2k -lrms -lmysqlclient -lxml2
The line as it needs to be for 'make' to succeed to build the binaries:
[code]...
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Feb 3, 2010
I have been using sed to manipulate a csv file but I have one problem that I can't solve. The csv file has many line and many columns. If in a particular line column 2 has a certain value I want to replace that value with the value in column 5 in the same line.
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Aug 23, 2010
I have an application which looks in a particular directory for it's settings. For example varsetting.txt. These settings are stored in a text format and can be edited easily. I would prefer to keep this setting.txt file on a USB stick rather than the HDD for portability so that I can easily use the same settings on two linux PC's without having to redit them everytime. I have tried but cannot manipulate the application to look in a different location for this file, do you know if it is possible to "point" linux to another location when looking for the file?
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Jun 11, 2010
Have managed to create a simple script to poll the various printers we have at our company for a page count via SNMP. At the moment the script echos the printer name to a text file and then the snmp output is appended to the next line. In my rush I thought by using sed to add a comma to the end of each line would mean it would import in to excel nicely. So rather than having:
Printer 1,
45536,
Printer 2,
[code]...
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May 26, 2011
I wonder capability of awk to manipulate data in consecutive multi files by read one batch file.for example I have files: data1.dat, data2.dat,data3.dat and listfile.txt
cat data1.dat
23 34 54
43 45 76
[code]...
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Jul 17, 2010
I own Fedora Core 12 and an HP scanner. I want to make digital copies of all the pictures I took a few years ago. I have a lot so I tried scanning five at a time thinking I could cut and paste into smaller images like with MS Paint on Windows. HPLIP 3.9.12 wouldn't let me modify the scans so I tried GIMP 2.6.10. GIMP 2.6.10 is a nightmare! When I opened my scan of five pictures I had trouble opening a new image. Then I had to specify the size of the new image. The when I cut and pasted I couldn't rotate. Then when I figured out how to rotate my image was too small.
Then I tried scanning just one picture but HPLIP left a lot of blank space. I tried cropping out the blank space with GIMP but the image size was the same with the blank space. I don't want to post photos to Flickr that are mostly empty space.I wish I could show you examples but the forum won't let me post them.Any ideas or suggestions for a program for Fedora Core 12 that's got the functions and features of MS Paint?
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Feb 13, 2011
I want to access a file, and check the length of every line.After, i want to check and replace all lines with length over 10 characters, with a message.Does anyone have a clue on that?
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Mar 3, 2010
I have a log file /var/log/messages. Now all i want is to delete the first line through script without disturbing provisioning the file.
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May 29, 2010
I've never programed shell scripting.
Code goes like so:
I simply want to read a file "data.txt" line by line Then char by char and add them into a result var. The file is supossed to always contain numeric values
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Nov 26, 2009
I want to replace a certain line of a file, my bash script looks like:
#!/bin/sh
sentence="if [ -e /home/inf/Download/$playlist ]"
sed '4c
$sentence' oldfile > newfile
mv -f newfile oldfile
But the variable $sentence can not be identified in ' ' . And also you can see I just want to update the old file. But the sed command can not save the file for me ,so I need to write them to a new file and over write the new file .
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Aug 24, 2010
I'm trying to figure this error message out. This little script is supposed to tweet my laptop's IP address, as a cron job, I'm hopeful that it would do so even if it's stolen. This is a variant of one that works, but this doesn't, and I can't see a difference in the curl line of either one.
Code:
#!/bin/bash
user="xxxxxx@xxxxxxxxx"
pass="xxxxxxxxxxx"
wget [URL]
TWEET=`sed -n 1p index.html`
curl --basic --user "$user:$pass" --data-ascii "status=$TWEET" "[URL]"
rm -f index.html
exit
This is the error message.
Code:
curl: (6) Could not resolve host: status=66.183.103.67; Cannot allocate memory
{"request":"/statuses/update.json","error":"Client must provide a 'status' parameter with a value."}
Why does curl think the status is the URL?
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Jan 15, 2011
I have a list of domains in "domains.txt" , and I wanted to put an "nslookup" in front of each line and run it.. However I could not figure out a command for it.. Any ideas how to do this simple task?
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Apr 11, 2010
I have a project due for my Intro to C++ class and we are suppose to generate a file listing that will take an input of a C++ source code with .cpp extension and make a copy of it with a .lst extention that will have a line number preceding each and every line.
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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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Jan 3, 2011
I wish to add information to one of my files based on matching IDs,
Here is an example
(the id is the 3 colunm)
(the ID is the 2 colunm)
And the output i wish to be
OUTPUT:
So as you can see the ones that do not match are still present, and the ones that do match just have the extra information from file2.txt added to them.
I thought about using join but that only seems to join the ones that match displays thoes only. i would like all the information in the output file.
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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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Oct 18, 2010
I have two txt files containing x and y coordinates: xcoord.txt & ycoord.txt. I need to open them; read them line by line to get each coordinate; then each time I need to update Xs and Ys parameters inside another file called "dc.in" with the grabbed values.
Finally each time I need to run two exe files ( dc_2002 and st_vac) and produce corresponding output for each Xs and Ys ( dc.in is an input file for this exe files)
I have written the following code but it does not work:
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Apr 1, 2009
Was wondering if any perl guru's could help me with a quick log file adjustment. I have a text file that looks like so (tabs and newlines are revealed so you can see what separates the data):
There are maybe 100 lines of text in this file at any given time. I need to delete all duplicate lines only looking at the first bit of text prior to the first tab. It doesn't matter which one gets deleted as long as there are no two lines that begin with that same text at the beginning before the first tab. So in this example, either the fist line "1234" or the last line "1234" would need to be deleted. I already have code in my script that opens the files - I just need the code to read the text into an array and the part that would find matches based on the above criteria, and make the deletions.
If it would be easier, I can even do a system call and use SED (v4.1.5) and/or AWK (3.1.5) instead.
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Feb 24, 2011
I'd like show a certain line or lines of a file with context, kind of like a unified diff, on the command line in Linux:
$ (something) -l 154 stuff.py
150: def foo(bar):
151: """
[code]....
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Apr 1, 2011
I am combining data from a couple different input files and creating an output file in a specific format. I notice that if I use the >> operator, information gets appended to a new line in my output file. This is useful, but if I'd like to append onto the CURRENT line, is there an easy way to do this? I've been googling around and see lots of complicated answers, nothing that suggests to me an easy way to do this. For example, if my output file looks like this:
b1a:] cat test
hello my name is
b1a:]
and I'd simply like to append "Bob", how can I do it? If I use
b1a:] echo Bob >> test
b1a:] cat test
b1a:] hello my name is
Bob
b1a:]
So what I would prefer is some command that would create the result:
hello my name is Bob
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Jul 7, 2011
bash 3.1.17(2) I'm trying do write a shell script which must operate on each line of an ASCII text file. So, all the code must be inside a loop, and inside the loop, the first thing should be to read the next line from the file. I have the bash read command. But it reads from stdin. Any way to make read from a file?
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Oct 16, 2009
Does anybody know how to get attributes for a video file from the command line? For instance I'd like to get the video file running time. I've looked all over and I can't find out how to do this; the "file" command shows some data but not running time. I'm sure there has to be a way.
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Mar 2, 2010
In C, I want to make a program that will take a file and replace it with a file that's nearly the same but with some minor changes. Also, I would like to point out that I'm still fairly much a beginner with C. As for an example of the file, I want to take something like this:
Code:
Random Crap
More Random Crap
Even More
Something That Changes XXXXX
[code]....
I figured the best way to go about doing this was to open the file and a blank file, read the original bit by bit and when it gets to the point that needs to be changed exchange the part that needs to be changed with what it should be changed to, delete the original file, and rename the new one to the correct name. So the first problem I've run into (and I'll probably have more) is that when I'm trying to read stuff from the original file, my program doesn't seem to be finding the original. I'm sure much of my problems will be just from not knowing how to use the C functions so bear with me. Right now I have the following:
Code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
[code]...
And when I try to run it I get the following:
Code:
Died Here: No such file or directory
Segmentation fault
Right now the length of 50 was just a random test length. Pretty much I was just trying to get it to read anything from the file. In the end I'm going to want it to read the entire file bit by bit, but at the moment I can't seem to get it to read anything.
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Mar 6, 2010
I have a code over there. It reads a line from file and converts contents of it to double.
Code:
/*
* fileRead.c
[code]...
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Mar 25, 2010
I need a qtimer to trigger reading of a file line by line, I have the code sort of running with the timer trigger but qtimer will just read the first line over and over as it is now.
Here is the code so far:
self.lcdtimer = QTimer()
self.connect(self.pushButton85,SIGNAL("clicked()"),self.update)
self.connect(self.lcdtimer, SIGNAL("timeout()"), self.lcdxyz)
Code:
def lcdxyz(self):
import time
import os
[code]....
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Mar 16, 2011
I need to edit a line in a file in gedit, but its read only. I need to change
; default-sample-rate = 44100
to
default-sample-rate=44800.
Would anyone know if there is an option to make a read only file editable? Judging by the responses to the thread I followed to enable my soundcard, it is possible, and perhaps there is some setting etc that needs changing
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Jun 10, 2011
How to open a file using command line in terminal and edit the code within it ?code...
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Feb 5, 2010
i want to read line by line in a files in C language actually my porblem is i have a one file cotains
AT
OK
if iam using fgets, it is reading each time AT only it does not moving to Ok in that file
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Apr 21, 2010
this script returns me :
sed: -e expression #1, char 2: extra characters after command
sed: -e expression #1, char 2: extra characters after command
Code:
#!/bin/bash
while read line
do
sed -i "$line" 'd' test.txt
done < test.txt
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Jan 13, 2010
I need to run a command in a shell script to insert a line in a file, after it finds certain line. To add the line 'user = mysql' after the line [mysqld] in file /etc/my.cnf
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