Questions tagged [perl]
Perl is a powerful, high level programming language. Questions about Perl should be limited to the Perl development environment, running Perl, or using Perl to automate tasks on your computer.
501
questions
194
votes
18
answers
162k
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Removing ANSI color codes from text stream
Examining the output from
perl -e 'use Term::ANSIColor; print color "white"; print "ABC\n"; print color "reset";'
in a text editor (e.g., vi) shows the following:
^[[37mABC
^[[0m
How would one ...
- 3,714
85
votes
11
answers
99k
views
When to use Bash and when to use Perl/Python/Ruby? [closed]
We are doing all our scripting with Bash so far, but I'm starting to feel a bit silly about it. While we can of course do everything we want with Bash (it's quite powerful), I'm starting to wonder if ...
- 1,279
36
votes
5
answers
55k
views
How to cut a file to a given size under Linux?
I want to shrink a file's size by brute-force, that is, I don't care about the rest, I just want to cut the file, say by half, and discard the rest.
The first thing that comes to mind is Perl's ...
- 8,851
34
votes
12
answers
5k
views
How do I remove a file in Linux whose name looks like it's ONLY a hyphen, as in "-"
I've tried
rm -- -
rm "-"
rm "\-"
rm \-
Gave Perl a shot
~$ perl -e '$junk = glob("-"); chomp $junk; print "$junk\n"; `rm $junk`;'
-
rm: cannot remove `-': No such file or directory
...and...
~$ ...
- 353
29
votes
5
answers
12k
views
Can I use perl regular expressions in the vim command line?
I want to use perl regular expressions on the vim command line. For example, to capitalize the words on the current line, you could type:
:s/(\w+)/\u$1/g
- 391
23
votes
3
answers
6k
views
Command vs program?
I was looking up the difference between adduser and useradd, and an explanation is that useradd is a command while adduser is a perl script. I understand what a perl script is, but what I do not ...
- 1,424
19
votes
8
answers
27k
views
How do I queue multiple files for copying on a Mac?
When I copy multiple files on a Mac, the system tries to copy them all at the same time.
The problem is two-fold.
First of all, when you select multiple files and copy them, they all go into one ...
- 515
18
votes
7
answers
22k
views
unix - split a huge .gz file by line
I'm sure someone has had the below need, what is a quick way of splitting a huge .gz file by line? The underlying text file has 120million rows. I don't have enough disk space to gunzip the entire ...
- 365
14
votes
2
answers
23k
views
How can I identify non-ASCII characters from the shell?
Is there a simple way to print all non-ASCII characters and the line numbers on which they occur in a file using a command line utility such as grep, awk, perl, etc?
I want to change the encoding of ...
- 3,714
13
votes
3
answers
33k
views
Getting the process id for current perl script
How do I get the process id for the perl process that's running the current script? getppid() doesn't return the same pid as ps -ea| grep .
Is there is an easy way or do I just run the ps -ea command ...
- 671
10
votes
7
answers
43k
views
How to convert .xlsx to .txt?
I want to know if there is a Linux tool or a script available to convert .xlsx file to .txt.
- 101
10
votes
1
answer
30k
views
Perl for matching with regular expressions in Terminal?
I'm trying to familiarize myself a little with Perl to use for regular expression searches in Terminal (Mac). Now, I'm not really looking to learn Perl rigourously, just trying to find out how to do ...
- 329
10
votes
1
answer
21k
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Counting occurrences in first column of a file
We have this file:
1 2
1 3
1 2
3 3
52 1
52 300
and 1000 more.
I want to count the number of times each value occurs in the first column.
1 3
3 1
52 2
This means we saw 1 three times.
How can ...
- 726
9
votes
3
answers
78k
views
How to execute a PL file in Linux?
I have a vmware-install.pl file that I need to execute. I double click it but Linux will open it in a text editor for editing.
How to execute this file? Can it be done from GUI?
In file's properties ...
- 2,111
8
votes
2
answers
17k
views
gcc not finding header file though its path has been included with -I
I'm trying to install a module (Package::Stash::XS) via cpanm, but the installation is failing due to a gcc error. The command:
gcc -c -DPERL_USE_SAFE_PUTENV -U__STRICT_ANSI__ -fno-strict-aliasing ...
- 1,489