Recent versions of host can perform a reverse DNS lookup directly on the IP address. If you have an older version, or wish to use dig or some other tool, you have to convert the IP address into the format used internally for reverse DNS lookups. Here is an example.
I am using egrep to extract numbers from a file and storing them as variables in a script. But I am not able to do any arithmetic operations on the variables using "expr" because it stores them as char and not integers. Here is my code and the error I get. Any help will be appreciated.
#!/bin/sh... (3 Replies)
Hi, I would like ask for you help for coding array operation.
array= ( a b c d e f )
I would like to remove entry "d" from my array and import the remaining entries back to the array.
Thanks. (3 Replies)
Hi,
Can anyone explain me what is the functionality of this code
cat << EOF > $TSTFILE
/$1/ { print "SENT" }
EOF
Suggestions welcome
Thanks in advance (0 Replies)
Gurus - Please help with this urgent situation.
I have the following problem to solve using a shell script:
1. There are about 13 files named CONTAINER_1.lst, CONTAINER_2.lst, CONTAINER_3.lst .....CONTAINER_13.lst
2. Each of these files contain about 8 lines (in most cases) containing... (1 Reply)
Hi I am new to shell scripting and trying to get values from a text file,
I have a text file with values seperated with "|". like
aga|120220090525|120220090525|120220090525|120220090530
bab|120220090530|120220090530|120220090535|120220090535|120220090535... (4 Replies)
I have a txt file with several columns and i want to peform an operation on two columns and output it to a new txt file .
file.txt
900.00000 1 1 1
500.00000
500.00000
100000.000
4
4
1.45257346E-07 899.10834 ... (4 Replies)
I have always struggled when parsing a file vertically vs. by line horizontally. Can't seem to get my head around the concept. Here again I need to convert vertical output to horizontal output.
original output
root@acuransx:bpplsched 2000-STAND3 -v -M acuransx -l
<2>bpplsched: INITIATING:... (4 Replies)
I need to read a file line by line, then depending on the contents of each line, type in a code that will get written to an array.
The problem I have is when I ask the user to confirm the input code, if it is wrong, how do i Return to ask again?
Any thing I try increments the file to the next... (6 Replies)
Discussion started by: kcpoole
6 Replies
LEARN ABOUT DEBIAN
pdl::pdl2
pdl2(3pm) User Contributed Perl Documentation pdl2(3pm)NAME
pdl2 - Simple shell (version 2) for PDL
SYNOPSIS
Use PDL interactively:
%> pdl2
pdl> $a = sequence(10) # or any other perl or PDL command
pdl> print "$a = $a
";
$a = [0 1 2 3 4 5 6 7 8 9]
DESCRIPTION
The "pdl2" program, also known as the Perldl2 shell, is a second generation version of the original "perldl" interactive PDL shell. It
attempts to be backward compatible in usage while providing improved features, better support for Perl syntax, and an more easily extended
framework based on the Devel::REPL shell.
If you have Devel::REPL version 1.003011 or later, then "pdl2" will start with full functionality. If Devel::REPL is not installed or
found then "pdl2" will print a warning and run the legacy "perldl" shell command instead.
By default, command lines beginning with the default prompt of either "pdl2" or "perldl" (one of 'pdl> ', 'PDL> ', or 'perldl> ') will have
the prefix string and surrounding whitespace stripped. This allows for easy cut-and-paste from sample PDL shell sessions or other examples
into another PDL shell session.
FUNCTIONS
do_print
Toggle print-by-default on and off (default value: off)
By default, "pdl2" does not print the results of operations since the results can be very large (e.g., a small 640x480 RGBA image is still
more than 1_000_000 elements). However, for experimenting and debugging more complex structures, it helps to see the results of every
operation. The "do_print" routine allows you to toggle between the default "quiet" operation and a full Read, Evaluate, Loop style.
pdl> $a = pdl(3,2)
pdl> do_print
1
pdl> $a = pdl(3,2)
$PDL1 = [3 2];
pdl> do_print
pdl> $a = pdl(3,2)
VARIABLES
$PDL::toolongtoprint
The maximal size pdls to print (defaults to 10000 elements). This is not just a "perldl" or "pdl2" variable but it is something that
is usually needed in an interactive debugging session.
SEE ALSO
perldl, Devel::REPL
perl v5.14.2 2012-05-30 pdl2(3pm)