Perl is a high-level, general-purpose, interpreted, dynamic programming language. It was originally developed by Larry Wall as a general-purpose Unix scripting language to make report processing easier, over a period with support from open source community, it has evolved and matured to be used for ...

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3
votes
3answers
5k views

importing data from a text file to a bash script

I need to import a text file like this below: AMBI CBNK CCXI CERE CLACW CNYD DAEG DLIA DLLR DNDN DSGX HAST HIBB, HPOL IRDMZ MARK NEPT NFEC NINE NRCIB OMER PLCC PLPM PSUN UNTK There are 25 entries, ...
0
votes
1answer
517 views

How can I split a file into multiple files based on pattern using perl? [closed]

How can I split a file into multiple files based on pattern using perl? Ex: input to be a .txt file, name of the output file stored in another .txt file
1
vote
1answer
557 views

Automation tasks for system administrators [closed]

If I am a junior UNIX/Linux system administrator, and I want to make automation tasks for the server. I know Shell script, Perl, and Python. All of these are used to make automation tasks. Which one ...
1
vote
3answers
727 views

How to limit MAX an MIN length of a string?

"nothing" means no OUTPUT. Q: how can I limit the MIN and MAX length of a piped STRING? (MIN: x>=3 chars, MAX: x<=32 chars) INPUT: echo 12 | MAGIC OUTPUT: nothing INPUT: echo 123 | ...
1
vote
1answer
54 views

How to make URL's out of this text with least resources?

INPUT: nyeeeeeeeeeeeeeee.txt:sadfsadf sadjflsajfd:jasdlfjalsfd foo/asdfsafd.txt:laksjdlfajsfd OUTPUT: <a href="nyeeeeeeeeeeeeeee.txt">nyeeeeeeeeeeeeeee.txt</a>:sadfsadf <a ...
1
vote
1answer
157 views

Why wouldn't Perl CGI script run

I'm using Apache on CentOS and am trying to run a Perl CGI script as directory index so it will run automatically as a subdomain. I added DirectoryIndex script.cgi and added a Directory stanza noting ...
0
votes
2answers
92 views

Programmatically get folders last edit time

How can I programmatically get a folders latest edit? I have already written the following script: #!/usr/bin/perl my @ls_command_result=qx(ls -l); my @the_folder=grep /folder_i_want/, ...
2
votes
1answer
274 views

how to replace IP address on remote host using expect

I wrote the following expect script in order to replace the IP address on remote Linux machine I use a perl one-liner for this task I get errors about can't read "HOME": no such variable , Please ...
5
votes
1answer
248 views

Execute a command within 'sed'

I have a list of random memory addresses saved in a text file, and I need to sed them out, decode them, and save them back to my file. However, the decoding operation I'm trying to perform is handled ...
2
votes
1answer
2k views

Forcing Bash to use Perl RegEx Engine

As you may already know, a lot of the features modern RegEx engines support (back referencing, lookaround assertions, etc.) are not supported by Bash RegEx engine. Following is a simple Bash script I ...
1
vote
2answers
984 views

fixing cpan by resetting it

So I ran into a simple little problem. This is a somewhat rookie mistake. I wasn't connected to the internet and started cpan. It started to configure for the first time and then when I realised a ...
0
votes
1answer
192 views

Read and parse XML input via TCP [closed]

I'm setting up something where I'll need to be able to setup a service that accepts input on a TCP port and then parses the XML provided and extracts the necessary data, then posts that to Google's ...
2
votes
6answers
4k views

Repeat each line multiple times

Would like to have each line in a file repeated a fixed number of times. e.g. have each line repeated four times: a b c becomes: a a a a b b b b c c c c I've done some searching, and there are ...
0
votes
3answers
417 views

according root permission to www-data

I have a perl script dhcpmanip.pl which contain this line: system "hostapd /etc/hostapd-1.0/hostapd/hostapd.conf"` It's a command to start hostapd and I get this error : Insecure `$ENV{PATH}` ...
2
votes
2answers
340 views

How can I use procmail to modify the body of an email and then forward it to an external address?

I'm struggling to get procmail to first transform, and then forward, a received email. Here's what I'd like to do: :0 f | ~/bin/encryptemail.pl | mail foobar@gmail.com That is, I want to run the ...
1
vote
1answer
671 views

How to filter an array of strings in ksh

Please advise what's wrong in my ksh code. I want to remove the IP's as defined in "bb" array from "aa" array so the IP's 255.0.0.0 and 255.255.255.0 will be removed from the list in aa array. When ...
2
votes
2answers
173 views

ksh + delete number from string

the string IP include some IP address numbers as the following example echo ${IP[*]} 192.9.200.1 192.9.200.2 192.9.200.3 is it possible to remove some IP address number from the list ( using ksh ...
1
vote
2answers
341 views

perl one liner + how to match IP address that located in the first/sec field of file

the following perl one liner syntax verify if IP address in "$IP" match the IP ADDRESS in file perl -ne 'BEGIN{$IP=shift} print if /(^|\s)\Q$IP\E(\s|$)/;' $IP file file have two fields as the ...
2
votes
2answers
167 views

linux & solaris - separate netmask IP's from ordinary IP's

I have file with IP address and netmask IP's my target is to cut the netmask IP's from the file_with_IPs.txt and paste them to another file as file_with_only_netmask_ips.txt remark - netmask IP can ...
-3
votes
4answers
863 views

perl one liner + how to replace any last IP address octets

How to replace any last IP address octets (four octet ) to 0 remark: Implementation should be by Perl one linear on linux machines for example 192.9.200.124 will replaced to 192.9.200.0 ...
3
votes
2answers
343 views

No idea how to troubleshoot Bugzilla email issue

I'm a complete n00b when it comes to Bugzilla (and complex perl applications in general) so don't assume any level of knowledge in that area. If I haven't documented it in this post, assume I haven't ...
1
vote
2answers
446 views

Perl - /etc/shadow - Permission Denied

The following command is being executed by a non root user : perl -pi -e 's/^an24:/an24:\*LK*/g' /etc/shadow A permission denied is being issued. This indicates some privileges issues. Can such ...
-2
votes
1answer
269 views

Difference between command line argument and giving an input command [closed]

What is the difference between @ARGV and asking the user for input? $num = $ARGV[0]; and $_ = <STDIN>; Either way a user has to put an input isn't it? How are they different?
-4
votes
1answer
133 views

Usefulness of @ARGV in Perl [closed]

What is the difference between using just normal arrays and the special array (command line argument)? Normal array: @num(1,2,3,4), and you can use $num[0], etc Special array: you have to use @ARGV, ...
-2
votes
1answer
62 views

Perl confused with script [closed]

Write a perl script that takes one argument, the name of a file or directory. The script should call the stat function and print the resulting data along with a one line explanation of each field. my ...
-2
votes
1answer
79 views

Perl Script Explanation [closed]

#!/usr/bin/perl -w use strict; my $args; $args=@ARGV; if ($args<1) { die("Expecting a filename"); } sub showstat { print " $_[0] dev, device number of filesystem\n"; print " $_[1] ...
2
votes
3answers
1k views

I want to find duplicates in a file and add a character to the end of the line on the 1st match

I am trying to find duplicates in a file and once a match is found mark the 1st match with a character or word on the end of the line. eg my file (test.html) contains the following entries host= ...
-2
votes
1answer
104 views

Perl only one option at a time [closed]

There is a requirement where I can't put two options at the same time. For instance with -a option: file.pl -a file.text # executes file But if I write file.pl -a -a file.text # it is ...
3
votes
2answers
337 views

Passing quotes and full strings to bash -c or zsh -c

When I am in Perl and I call system(some_command), this invokes some_command on /bin/sh. I would like it instead to run some_command in another shell such as bash or zsh. One way of running ...
-3
votes
1answer
95 views

perl script explanation please [closed]

Write a perl program that reads in a text file containing one word per line. Create a hash containing the words read as keys and the number of times they have been read as the value. Print ...
2
votes
3answers
2k views

Easy way to parse syslog date format

I'd like to write a script that analyses the last week's syslog. But my syslog logs in a stupid date format, e.g. "May 22". If it logged as 2013-05-22, this task would be trivial. Is there a way ...
3
votes
3answers
186 views

sed + how to remove character/s that start or ended on each number

How do I remove the . character(s) that start in the beginning of each number or end on each number? Remark – perl one liner also good alternative for sed. Example input: .23.12.44.5. .233.3.3.3 ...
1
vote
1answer
226 views

Perl dependency issue

I've installed CentOS 6.3 (i386) recently. It has two perl binary /usr/bin/perl (v5.10.1) /usr/local/appx/perl/bin/perl (v5.8.8) My question: Is it possible to install some other funtinonality ...
6
votes
2answers
703 views

Special character '#' in Perl SSH command

I try to send command using SSH in my perl script with # but it gets truncated right at # Example: Input text is : $message = "Product ID # STK000134" The SSH command is : $execute=`ssh -q ...
7
votes
4answers
4k views

How to remove multiple blank lines from a file?

I have some text-files I use to take notes in - just plain text, usually just using cat >> file. Occasionally I use a blank line or two (just return - the new-line character) to specify a new ...
1
vote
2answers
59 views

Trimming one part if equal to another part?

I use an e-mail quote attribution string like this: On dd mmm yyyy hh:mm +hhmm, from info@example.org (Example Dot Org): where info@example.org is the sender's e-mail address and Example Dot Org is ...
0
votes
2answers
273 views

Reordering strings in linux

How can I change lines around using the command line? e.g. I have these lines: Acct-Status-Type = Start User-Name = "37XXXXXXX" Event-Timestamp = "Apr 12 2013 15:56:55 AMT" I need to ...
3
votes
3answers
2k views

Delete XML node containing certain element

I want to remove all Placemarks from a KML file that contain the element <tessellate>. The following block should be wholly removed: <Placemark> ...
0
votes
3answers
560 views

Sorting IP address according to the second field in file

in my ksh script I need to add the following task ( OS - linux/solaris ) I have the following file more test.txt /etc/backup/app 172.1.120 172.110.120 /etc/backup/app 172.1.120.12 ...
0
votes
1answer
113 views

read line by line and take a string in line and assign that string to the subsequent line using perl [duplicate]

Data file is fixed length file, and I want to read file line by line and take a string from the current line, and then append that string to the subsequent line and write into another file. For ...
-3
votes
1answer
161 views

How to transform two delimited ASCII files

These are 2 common delimited, text file transformation problems I'd like to find scripts to do (I dont know if awk or perl is best for these tasks). csh is the default shell on my Solaris10 unix ...
0
votes
3answers
114 views

Grep end regex matching

On OS X, system_profiler SPHardwareDataType outputs: Hardware Overview: Model Name: MacBook Pro Total Number of Cores: 4 L2 Cache (per Core): 256 KB L3 Cache: 8 MB Memory: 8 GB I want to ...
2
votes
3answers
337 views

awk, sed, grep, perl… which to print out in this case?

I have this syntax in a file (http response times from analog): <thead><tr><th class="x">seconds</th><th class="R">reqs</th><th ...
17
votes
2answers
10k views

What does ${1+“$@”} mean in a shell script, and how does it differ from “$@”?

In the Perl documentation, perlrun(1) suggests launching Perl scripts using a bilingual shell/Perl header: #!/bin/sh #! -*-perl-*- eval 'exec perl -x -wS $0 ${1+"$@"}' if 0; What does ${1+"$@"} ...
0
votes
2answers
107 views

perl one liner + print VALUE in the end of the line

The following perl one liner checks if $CURRENT_VERSION matches $NEW_VERSION exactly, and prints it if it does. Example: CURRENT_VERSION=223.3.12.4.5.3 NEW_VERSION=223.3.12.4.5.3 DATE=17.3.2013 ...
2
votes
1answer
266 views

perl + combine exec command with perl one liner line

I have the following short perl script rename.pl. How can I translate this script to one liner perl syntax? And how to combine the perl one liner in find command? rename.pl #!/usr/bin/perl $op = ...
0
votes
1answer
940 views

Rename files and directories with a special characters on solaris machines

The target of the following code ( commands ) is to rename files/directories and also support files/directories with a special characters as "@" or "." etc those commands are run fine on Linux ...
0
votes
2answers
167 views

Running something in a cron environment?

Cron executes whatever program is sent to it in such a fashion that anything written to STDERR causes either the kernel (or cron I'm unsure) to receive SIGPIPE. How does this functionality work? Is ...
1
vote
2answers
108 views

renaming a directory and its subdirs without affecting their files

I have to rename directories under the root directory with prefix "ms_PF" and then rename their subdirectories with the modified name of the main directory with an extra "_", and then copy all ...
1
vote
1answer
107 views

How do I reinstall the bioperl modules on Ubuntu?

I am trying to learn bioinformatics the hard way. I have no background in Linux, Ubuntu, bash, Perl, Python, etc. I'm trying to use several programs, mostly the bioperl modules, that have been ...