Programming :: Bash And Perl - Script Adjustment
May 24, 2010
I wrote this script for bash & perl. If you run it in bash it should work. It changes title - (uuid) kernel - initrd ... to title - uuid UUID=the_uuid... kernel - initrd .... When I wrote it I replaced end of lines by . It's the second $block definition. But now I need to repair it, because I will work with the 1st $block definition. That is not to exclude end of lines, but leave it be untouched. Now when you escape the second $block definition, the code does not work. What I have to do to repair it working with multiline input data?
Code:
block="title Sata Mandriva
kernel (UUID=eab515e9-bc3e-4024-9f01-55fddaa0fb1c)/boot/vmlinuz BOOT_IMAGE=linux root=UUID=eab515e9-bc3e-4024-9f01-55fddaa0fb1c resume=UUID=e12487ff-6d6f-44c4-9e03-33f545b3b798 splash=silent vga=788
initrd (UUID=eab515e9-bc3e-4024-9f01-55fddaa0fb1c)/boot/initrd.img"; .....
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Apr 8, 2010
I've been trying to figure out a way to more easily color text in Perl like I do on Bash on a Linux box. In bash, what I'll do is set color variables up to equal the escape sequence, then echo out with escape seqeunces to print it exactly how I want it. Typically I'll want a character or a word in a different color, not the whole line. For example
echo -n -e "My face is turning ${RED}red${UNCOLOR} like a lobster." In Perl with the term::ANSIColor module, it seems to just do a line. Am I being dense? Is there a way that I can do it like I do it in BASH that's fairly easy to read after the fact?
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Mar 17, 2010
I am writing a script based image manipulator but i need to know if X is running so i can tell if i use CACAVIEW to imagemagick DISPLAY command.
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Feb 13, 2011
I would like to find something portable that work on all machines. I have hmtl2text installed, and perl and sh.
Anyone would know if someone already made such thing to read new through the console ?
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Mar 11, 2010
I've recently inherited a bunch of files at a new job and am trying to figure out some of the problems that have constantly popped up. The one i'm getting a huge headache with results from a bash script that is supposed to change a date format from a client populated txt field to one we want defined a certain way. Everything in the script works fine, except that one function. Below is the line i'm trying to manipulate, with date examples.
sed -e 's/.0000 EA/ EA/' -e 's/ 01012010 / 01-JAN-2010 /' -e 's/ 12312011 / 31-DEC-2011 /'
The one caveat is that the first date is non-static and changes daily. It is, however, always the current date. If it helps, the second date will always be a year away from the first date.My idea was to pull the current date via perl's DATE function, but...how to do it, and calculate a year away without throwing the rest of the bash script off? Any help would be appreciated. I'm sure it's a simple solution but i know absolutely nothing about these scripts and how they were written.
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Apr 1, 2010
pretty simple. how would you background a process from a script and get its process id at the same time?
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Jul 11, 2010
This pretend to be a script for rename a lot of files automatically. So I put the list of files in an array named @lista. But, as you can see, at the end of the command I use a sed filter to print out a backslash for those files that have spaces in their names, so the path for those files could be rightly interpreted.
But there's no way I could print a backslash. It works well when I use the Perl's sed substitution s///, but I need every path in the array to be fixed.
I'd like to add that the bash command works perfectly well alone. I mean outside the Perl script.
This is de command line with the sed filter:
Code:
And this is what it brings:
Code:
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May 4, 2010
Seeking a decent Perl or Bash script or hack used to copy data from a CD/DVD to local or even remote hard drive/storage.
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Feb 14, 2011
I wanted to find and replace a string from a perl file. I have written a script in bash which runs the following command.
perl -pi -e "s/$findstring/$replacestring/" testfile
where as $findstring = print F_WC_TMP"$line
";
and $replaceString = $line = join ' ', split ' ', $line; print F_WC_TMP"$line
";
But when I am running the above command, i think it is replacing the $findstring with the above mentioned string and hence it contains a $line, it is looking for the variable $line and not finding the exact string. I am confused about how to search for a string that contains $ in it and replace it with another $string.
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Feb 10, 2011
Everyone knows that it is like impossible to use mplayer to watch an *.html file. OK.
For instance here is a cool example of lot of streaming for firefox
http://watchtvlivestreaming.com/tvlive/b5499
Code...
Anyone is there a talented bright coder, coming from hell -because it is really difficult, to make such console program ?
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Jun 30, 2011
I am trying to fix a perl script, and I really suck at perl. But I think this problem will be easy for people who know it.
The problem is, I have an old setup script someone wrote many years ago. It fails if the standard shell is dash and not bash. The only way I've gotten it to work is to point /bin/sh to bash. I looked thru the script and it uses "system" many places, and I think that's the problem.
I searched for it and found this link:url
My plan is to include this function:
Code:
sub system_bash {
my @args = ( "bash", "-c", shift );
system(@args);
}
Then I could simply change all calls to system into system_bash and it should work?
The parameter to the system calls is usually some variable. What if the parameter is a list already? Do I need to test for it somehow, and if it's a list, prepend "bash" and "-c" to the list? How do I do that?
In the script there are lots of places like this:
my $error = system($cmd);
if ($error) {
die/warn "some error message";
}
Shouldn't there be a return in the system_bash function?
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Apr 6, 2010
I'm not sure if this is best done in Perl or Bash. I'm thinking surely someone else has created something close to what I'm looking for. The results of the script would be that someone would kick off "linux_hosts.sh" r whatever you want to call it, then a top "folder" of options (with hosts contained within each of these top menu choices), then, based on which number corresponds to that top level, they're presented with a set of linux hosts that are relevant to that top level name. Example:
$ linux_hosts.sh
1. VMware hosts 4. Private Domain
2. ESX servers 5. Red Hat boxes
[code]...
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Jan 16, 2011
I can not make this work: I can send email from bash with this script: #!/bin/bash echo "Test message" | /usr/bin/mail -s "test2" "myEmail@yahoo.com"
When I am trying to run this in Perl using system function like this:
#!/usr/bin/perl
system("'Test message' | /usr/bin/mail -s 'test2' 'myEmail@yahoo.com');
I get message that program exited with code 0 , which is nice, but mail does not get to destination.
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Mar 23, 2011
I'm playing with perl and found that I could just go:
"perl /home/me/bash_script.sh"
and it would execute, even though it's not a perl script. Is that just a feature or is there something I'm missing? Why does perl do this?
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Nov 8, 2010
I wanted to run bash and perl scripts which requires SU privileges by clicking on desktop
Terminal window opens and closes fast without knowing what happened.
scripts work on terminal window by telling
sudo perl file.pl
sudo bash file.sh
Perl has this header
#!/usr/bin/env perl
or
#!usr/bin/perl -w
Bash has header
#!/bin/bash
How can I run them with desktop shortcuts with SU privilege so, the terminal will not close after execution? Should not the scripts work without telling perl or bash, since they have the header?
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Nov 8, 2010
I wanted to run bash and perl scripts which requires SU privileges by clicking on dektop Terminal window opens and closes fast without knowing what happened.
scripts work on terminal window by telling
sudo perl file.pl
sudo bash file.sh
Perl has this header
#!/usr/bin/env perl
[Code]....
How can I run them with desktop shortcuts with SU privilege so, the terminal will not close after execution?
should not the scripts work without telling perl or bash,
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Jul 29, 2011
I've been asked to do certain jobs doing scripts in bash and perl. So this time they asked me to check which users hasn't been able to loggin. DONE with Code: lasb Now they asked me to show how many times all the users have input certain Bash Commands like
Code: Ls Cd pwd I was wondering if there was a command of something that could show me how many times those commands has been used, I already know I can see all input with Code: history Sorry I'm really new to this, been working with this for a couple of weeks, and its really interesting.
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Apr 4, 2011
I'm writing a bash script that executes a few perl scripts. One of the perl scripts that I need to execute requires two arguments with it. The arguments are stored in a txt file, each line contains a hostname and its corresponding IP address separated by a ":" (colon), the txt file looks like this below:
[Code]...
I'm not sure if it's the best way to accomplish this but here it goes. In the bash file, let's call it getHosts.sh, I create an array and assign each line of the file to an element in that array. I then think I need to create a new array where I take the hostname (which is before the ":") separate it from its IP address and place the IP address on a new line just below the hostname (this way I can reference to it like $hostNames[$x] would be the hostname, and $hostNames[$x+1] would be its IP address). So the new array would now look like this below:
[Code]...
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Jul 21, 2010
Where is the perl module for programming with sockets?
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Feb 4, 2011
I would like to know how do I print the line # in a script. My requirement is, I have a script which is about ~5000 lines long. If there are any errors happen I just exit. And I would like to add the line # of the script where the error happened.
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Jan 24, 2010
simple bash code:
Code:
#!/bin/bash
trap "echo 'you got me'" SIGINT SIGTERM # to trap ctrl+c
echo "Press ctrl+c during 5 sec loop"
for ((i=0;i<5;i++)); do
[Code]...
How come code behaves normally and stops when ctrl+c signal is caught and resumes, but after I use at least one timeout read in the code it looks like, if signal is caught again it doesn't pause the execution but skips the loop. If you remove -t (timeout) option from the read, both loops look the same!
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Nov 26, 2008
I have a config file that contains:
my.config:
Code:
Now in my bash script, I want to get the output /home/user instead of $HOME once read. So far, I have managed to get the $HOME variable but I can't get it to echo the variable. All I get is the output $HOME.
Here is my parse_cmd script:
Code:
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Jul 25, 2011
I have written quite a few separate bash & scripts and php scripts that up to now I have run from cron jobs. However I have to estimate how long each takes to run, before running the next and so it probably takes much longer than necessary to run them all. They have to run in order.
Now there are so many I am thinking it would be better to have a master bash script that would run one after the other, but I am not sure how to get the master script to wait before starting to run the next script. Is this possible and is there a command that will make the script wait between bash and php scripts , for them to finish, before running the next?
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Jan 9, 2010
I would like to get the filename (without extension) and the extension separately. The best solution I found so far is:
Let FILE="thefilenameofsomefilesfor_instance.txt"
Code:
NAME=`echo "$FILE" | cut -d'.' -f1`
EXTENSION=`echo "$FILE" | cut -d'.' -f2`
I think it would be better to count the len and remove 3 chars to right to get the extension, but it can be macintosh filenames with have 4 chars for extensions.
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May 9, 2010
I just downloaded Tk-804.028 and try to install it (according to the README.linux) but I get:
> perl Makefile.PL
/opt/ActivePerl-5.10/bin/perl-static is installed in /opt/ActivePerl-5.10/lib okay
PPM for perl5.010001
Test Compiling config/perlrx.c
Test Compiling config/pmop.c
Test Compiling config/pregcomp2.c
[code]...
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May 18, 2011
Any recommendations on what Perl tutorial to use?
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Jan 30, 2010
I am taking an input from the user for free and Used capacity in a disk. I wish to convert Input entered in MBTB to GB and this is how i am doing it.
Code:
<some code>
print "Enter Total disk space";
$tot = <STDIN>;
convert($tot);
[code]...
how do i pass the value of conv[0] after conversion back to $tot or $use such that they contain only value which is in GB?
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Jul 24, 2010
I really would like Perl Qt4 bindings. The best I could find is this:[URL]The problem is that the sources would not compile, and the RPMs are for 32-bit machines.Is there really no such thing as good Perl Qt4 bindings?
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Mar 27, 2011
I am a newbie on linux and just searching everything about perl scripting and modules nearly 3-4 days. I need a perl script but one of not easy to find on searching google. Okay now I need a perl script which create or recreate (edit) id3 tags (artist, comment, album, year, cover) of mp3 files stored on my linux centos server. I installed MP3::Tag version 1.13 pearl module to my server. I Searched tutorials about how to use it, finally I get through reading id3 tag of mp3 file but not achieve to modify it or create a new id3tag.
These are the details:
I have a mp3 file called 1.mp3 this script will process that '1.mp3' file read its id3tag if there is one, than modify or create id3tag for it by my fix artist name for example:
'1.mp3' files id3 tag details are like this
Artist: Dj xx
Year:2010
Title:yyyyy
Comment:eerwer
Cover: x.jpg
Now via this perl script which uses MP3::TAG I will change it's
artist as YYY
Title:ttt
Comment:cool
Cover:t.jpg
these are gonna be my fixed values. I mean all '1.mp3' file will have same artist based on script value.
The reason of this script is I will share Dj podcasts on my server and Dj's would have upload their mp3's which has got different id3 tags and cover pics. etc. I want to create more organized podcasts of them by the way I would trigger this perl script via Cronjob.
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Mar 31, 2010
How can I generate a md5 or sha-1 code with perl?
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