Programming :: String Concatenation In Perl Result In Two Lines - Not One?
Jan 11, 2010
I am new to perl and am having trouble adding some strings together.
My full code is below:
The problem is $NewCommandB is always split into two lines, where the second line contains the "/atlas2/<blah>/<etc>/..." string. Since I am generating a .sh file to execute a lot of similar commands I need the string to all be on one line. Any idea why I get this behaviour and any suggestion on how to tell perl to make $NewCommandB a one line string?
Btw for completeness finalFileList.txt contains just file names one line after another:
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Apr 15, 2011
What is the best way to merge lines, in sed, awk or perl, that occur between certain strings? I'm new to sed scripting and I have been working on this for some time now. I have a large file (sample below) that I need to edit.
What I need looks something like this.
I'm working with a very large file so simply merging all the lines then adding a new line character before ">contig" and after "translated" won't work, at least not with sed.
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Jun 19, 2011
what's the equivalent code of Perl?sed -i 777,2545!d somefileObviously it extract lines of somefile between that 2 digits .
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Sep 15, 2010
The below program is giving unpredictable and wrong output when I compile with g++ under Ubuntu OS , tried with the complier avilable with Ubuntu 8.04 and Ubuntu 10.04 LTS.
But it works fine when complied and ran Redhat g++ 3.4.6
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May 4, 2009
Inside a loop i'm populating a string variable. Because csh doesn't have very good support for arrays I thought of doing this. I want to add a new line character to the end of the concatenation each time the loop iterates. Then at the end print this variable out.
I tried " and some resources said it was just a "". Neither work. What am I doing wrong?
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Aug 5, 2010
I wanted to get the ORACLE_HOME of the listener's running on the server.I have been using the following to get the reult. /opt/oracle/admin/PHYPE/bdump> ps -ef|grep /bin/tnslsnr|grep -v grep|awk '{print $9}'
Result is as follows
/opt/oracle/product/10.2/bin/tnslsnr
/opt/oracle/product/9.2.0/bin/tnslsnr
/opt/oracle/product/10.2/bin/tnslsnr
/opt/oracle/product/10.2/bin/tnslsnr
/opt/oracle/product/9.2.0/bin/tnslsnr
/opt/oracle/product/10.2/bin/tnslsnr
Now i wanted to cut the /bin/tnslsnr part and the remaining should write to the file.
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Sep 15, 2010
One of my application generates a text file with an XML output in it. I need to read that log files and if the output does not match to a string in couple of tags it should create a log file with the file name and the the tag name.
The two tags where the string should match is:
Identity format tag should always be JPEG , well- formed and valid status tags should be true.
sample output file:
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May 4, 2011
there is a way to add line spaces when asking for user interaction in a script. For example:
Code:
SPACE
Hello what is your name?
SPACE
SPACE
So this is asking a question but has a space/empty line at the top of the screen and 2 spaces/empty lines below. I've seen it done in a bash script using for each line/space needed
Code:
echo ""
So what does perl use?
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Mar 16, 2011
I am trying to read certain lines within a file and give the output of the certain lines that dont equal my value, I think showing you would be easier. There is multiples of these inside one file...
Code:
LV Name /dev/vg00/lvol1
LV Status available/syncd
LV Size (Mbytes) 300lable/syncd
[code]....
I want to read everything in the file, if the status is not available then it should display the name (directly above status). If they are all availbale then do nothing. I think I know how to do it which includes putting the info in string form and placing in hash but it is proving to be out of my skill range.
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Sep 27, 2010
I want to read a input from user and output something like 'inputcd', which has to escape all backslashes if using double-quote. For instance, the following code would work.
Just curious if any other way I could do it without specify all backslashes? Since that takes much efforts when the sequence is long.
Code:
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Jun 3, 2011
I am new to perl and not able to understand all the pattern matching.
I using this script to send the status to another Nagios server using ncsa. Nsca don't transmit "()" So I need to remove them before sending.
Currently I am using
Code:
for the string
Quote:
This is working fine but its is not working when there is change inside the bracket for e.g (6290)
I want to change this code to work for any change with in the brackets.
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Apr 9, 2010
I have a requirement like this..this just a sample script...
Code:
when i run this scipt...
Code:
Code:
It is appended in the same line...
I want it to be added to the next line.....
I want to do this by explitly using the filehandles in perl....and not with redirection operators in shell.
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Jan 6, 2010
In my perl script I'd like to test if a string is written in uppercase letters or not. How can I do that? This type of test don't seem to work, so there must be other ways of doing this:
Code:
...return true.
I can create a subroutine that compares each character aginst a list of uppercase letters, but I'm hoping there's allready a build in routine in perl that does this...
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Jun 30, 2011
I have question about replacing a string in a file.
How can I replace the printerb's 10.1.1.1 to something else(10.1.1.2, for example) without replace printera's 10.1.1.1 accidentally?
I have tried perl -e -pi "s/10.1.1.1/10.1.1.2/g" /etc/hosts. but, perl replace both 10.1.1.1 to 10.1.1.2.
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Apr 15, 2011
I have a file looks like the following:
digraph topology
{
"192.168.3.254" -> "10.1.1.11"[label="1.000", style=solid];
"192.168.3.254" -> "10.1.1.12"[label="1.000", style=solid];
[code]...
Order of these lines are random... So I cannot delete line #19, for example... And you can see that top four lines I want to delete are pairs. So there might be some clever way to detect the lines, if a line has both "1.9" and "1.11", then delete the line... I am new to perl language. The following is the code I have now... I think I just need to write some code inside the while loop checking if I want to delete the line $dotline before I write to a NEW file.
Code:
#!/usr/bin/perl -w
$TOPPATH = "/tmp";
$NAME = "topology";
$FILENAME = "$TOPPATH/$NAME.dot";
[code]....
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Jul 19, 2011
I have a script to utilize the perl one liner to replace a ip address.
Code:
#!/usr/bin/ksh
set -x
PRIP=172.15.100.176
OPRIP=172.15.100.115
[code]....
the script runs fine. but the perl one liner seems not working at all. but if i copy the perl line to a command line, it runs correctly.
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May 11, 2011
I'm trying to split a text file into various parts. Everything in between "123" and "break" (including linebreaks) goes into the splitted file.
e.g. using this text file:
This should split into 4 files. However I'm only getting 2 files: one for the line "123break" and one for "123 blah break". The two occurrences that contain linebreaks are being ignored. The .* part of my match should capture linebreaks seeing that I'm using the /s modifier shouldn't it? Even when I use the match /(123 break)/gs it still doesn't capture the first occurrence. I'm using Perl v5.12.3 (from ActiveState) on Windows XP. The text file is also in Windows format.
Code listed below.
The above code generates two files Output_1.txt and Output_2.txt which contain "123break" and "123 blah break" respectively. I want it to generate four files.
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Jun 4, 2010
How can i split a string like this,
Code:
This is my first line.
This is my second line.
This is my third line.
into,
Code:
"This is my first line.", "This is my second line.", "This is my third line."
in C++.
i.e. split the code at every new line
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Jan 9, 2010
how do you include a string variable as part of a regex in Perl?
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Apr 11, 2011
I have a dataset of around 1000 lines. Out of these 1000 lines I need to pick randomly 160 lines of data and write it to a file. The program is needed to eliminate data bias when I run the program through a reanalysis program. I am thinking I need to use the rand or srand term, but I am having difficulty writing this in perl. I have to write it in perl, because the rest of my scripts for this project are in perl, so consistency is important. The data only consists of one column of the data (YYYYMMDDHHHH).
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Aug 16, 2010
I have written a regular expression (tested in regexpal and regextester alpha something) with which I want to replace something like code...
but it only matches functions which occupy one line only, despite my tests showing multiple line matching in javascript testers online and using the m and s flags (which should make it multi line no?)
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Apr 13, 2011
In a file,
I need to remove a part of string: /o
string:
or
the string can be
here I need to remove /d2
So, I need to remove everything after when I get last /
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Nov 10, 2009
Each line of the file I am sorting is in the following format:
<url> <month> <day>
For example:
[URL]
I wrote the following to sort:
Code:
#!/usr/bin/perl
$in = shift;
chomp($in);
[code]....
The script worked fine for my small testing files, but failed in my input file. The input file is 18MB and containing more than 300,000 lines. The output will contains some lines like that:
url_one 10 1
url_two 10 1
url_three 10 3
url_four 10 1
Is that because my file is too big for perl to handle ?
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Apr 1, 2009
Want to return current LINES=, tryng to avoid the "hacky" backticks and string manipulation way
ie: my $somevar = `set | grep LINES`
I tried using the env command and it returns a empty value?
my $lines = $ENV{'LINES'};
$= doesnt work well for putty sessions...
my $lines = $=;
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Jul 16, 2010
I have a large text file that's formatted sort of like this:
Code:
foo bar
blah
[code]...
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Feb 14, 2011
I wanted to find and replace a string from a perl file. I have written a script in bash which runs the following command.
perl -pi -e "s/$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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Mar 10, 2011
M busy upgrading one of my clients old Debain etch boxes to Lenny but i keep on getting this error.
Use of uninitialized value in concatenation (.) or string at /usr/share/perl5/Debconf/Config.pm line 22.
debconf: delaying package configuration, since apt-utils is not installed dpkg: unrecoverable fatal error, aborting: syntax error: unknown user `root' in statoverride file E: Sub-process /usr/bin/dpkg returned an error code (2)
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Jan 26, 2010
I've come across an unusual requirement for a service in my Ubuntu system.Simply put, I need to find a way to search for all instances of a term in a file, delete lines containing containing that term, and delete four lines below each instance of that term. ither that, or copy the entirety of a file to a new file and skip over all lines containing the term plus four below it.This sounds kinda weird, I know. Without going too far into detail, I either have to change the logfile format for a server I'm running which is a huge pain in the butt, or I can just run a script to edit an HTML report generated from said logs. (Said report is really just for managers to peruse, and I like my log format, so I'm pursuing option 2.)
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Mar 9, 2010
I get an error when typing perl build.pl: Code: Cannot locate Unicode/String.pm in @INC
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Jul 28, 2009
I have script that I'm working on that updates a username in all the files that are called blah.inc for my framework. since i host a bunch of these web apps i need to do it to all of them. so I need to figure out how to update these files automagically with out me watching it to call vim every time. heres what I have so far
Code:
This finds the files but now i need to figure out how to do s/bob/fred/g on those files.
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