Questions tagged [perl]
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 graphics programming, system administration, network programming, finance, bioinformatics, and other engineering applications.
1,364
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Find server with small ping latency (my script, but can anyone write it in e.g.: Perl?) [closed]
I want to download OpenBSD with FTP with a script, and I want to download it from a server that is near me. So I want to choose a mirror that has low "ping latency". I wrote a little script, that ...
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9
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How can you combine all lines that end with a backslash character?
Using a common command line tool like sed or awk, is it possible to join all lines that end with a given character, like a backslash?
For example, given the file:
foo bar \
bash \
baz
dude \
happy
...
- 19k
1
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1
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How to convert <a href="http://xy.com">XY</a> to [http://xy.com XY]?
Just for editing Wiki's..
So i have this input [from a larget text]:
TEXT TEXT BLA-BLA RANDOMSTRINGS BLA-BLA
TEXT TEXT BLA-BLA RANDOMSTRINGS BLA-BLA
TEXT TEXT <a href="http://xy.com">XY</a&...
- 40.6k
4
votes
5
answers
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Replacing text from a list of replacements. Added complication: backslashes
I have a file A that contains pairs of strings, one per line:
\old1 \new1
\old2 \new2
.....
I would like to iterate over file A, and for each line perform the replacement (e.g. "\old1 -> \new1") ...
- 615
10
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6
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Is there any alternative to grep's -A -B -C switches (to print few lines before and after )?
grep -A 2 -B 3
prints 2 lines after the grep string and prints 3 lines before.
grep -C 3
prints 3 Lines before and 3 lines after
Unfortunately, the grep I'm using does not support these options. ...
- 261
3
votes
3
answers
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Get last set of non-empty lines
I'm running a cron job which should get only the last result of iostat -d 1 2. This requires some parsing: What is the simplest way to get the last set of non-empty lines from standard input to ...
- 51.8k
13
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3
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Is there a way to make perl -i not clobber symlinks?
A friend of mine points out that if you do:
perl -pi.bak -e 's/foo/bar/' somefile
when "somefile" is actually a symlink, perl does just what the docs say it will do:
It does this by renaming the ...
- 40.5k
2
votes
2
answers
284
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Perl find and replace is writing every file
Here's the test script I'm running
matt@server:~ $ cat test.sh
#!/bin/bash
mkdir test
cd test
echo "has the string foo" > yes.txt
echo "hasn't the string" > no.txt
ls -l --time-style=full-iso
...
- 736
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3
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piped program in sendmail's /etc/aliases
I'm trying some sort of auto-subscription via a homegrown script. I know it can be achieved by mailing lists such as Mailman but I also want to learn at the same time on how to do it by hand.
Here's ...
- 439
4
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1
answer
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Query DHCP server leases from Perl script
I have a Windows 2003 server and need to poll the DHCP lease information from it with a perl script that is running on a Ubuntu server. Then I need to analyze & store the information in a mysql ...
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3
answers
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How can I install perldoc on Ubuntu?
Ubuntu 10.10 comes with Perl 5.10.1 pre-installed, but strangely enough perldoc isn't part of the package.
$ perldoc
You need to install the perl-doc package to use this program.
How can I make this ...
- 10.8k
2
votes
4
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Using regex to see if a UNIX process is up
In UNIX, I am checking to see if a process is up by executing the following command;
E.g.
psg dtllst pe99
This returns the following output if the process is running;
UID PID PPID C ...
sandeep
15
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1
answer
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Execute Nohup command with input
In UNIX, I have a process that I want to run using nohup. However, this process will at some point wait at a prompt where I have to enter yes or no for it to continue. So far, in UNIX I have been ...
Sandeep
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1
answer
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Replacing multiple lines in sed or awk [closed]
I'm trying to use sed or awk to replace 5 lines in a smb file but I just don't have any idea how to deal with the newlines.
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