01-31-2009
PERL I/O question
Playing with an until loop as follows:
my $input;
until ($input eq "quit") {
print "Please enter something:";
$input = <STDIN>;
chomp $input;
if ($input eq "dog") {
print "cat" ;
}
else {
print "Please re-enter";
}
}
Something simple like this...
I want to prompt the user to enter something. Whatever they enter, print something and ask again, unless they say "quit" and then quit.
Trying to get a handle on the until() loop and am either getting one of the following problems:
1. Infinite loop/print on "please enter something"
2. The program quits after I enter something
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Where can i find solid information about programming in Perl?
Thank you in advance!!!:) (5 Replies)
Discussion started by: SolidSnake
5 Replies
2. Shell Programming and Scripting
When i run my perl/tk script, a perl window pops up behind the GUI window,, can this be hidden????
Also, can the Icon be changed, the Tk icon in every window??? (1 Reply)
Discussion started by: perleo
1 Replies
3. Shell Programming and Scripting
If I use 2 system commands in a script, will one finish before the next one starts? or will it start the first and the second at the same time?
i.e.
system("ps | grep rminer");
system("ls -al | grep 431"); (1 Reply)
Discussion started by: BG_JrAdmin
1 Replies
4. Shell Programming and Scripting
Hello,
pkzipc of a certain zip file yeilds the following in shell
PKZIP(R) Version 6.0 FAST! Compression Utility for AIX
Copyright 1989-2002 PKWARE Inc. All Rights Reserved. Registered Version
PKZIP Reg. U.S. Pat. and Tm. Off. Patent No. 5,051,745
Viewing .ZIP: test.zip
Length... (13 Replies)
Discussion started by: jerardfjay
13 Replies
5. Shell Programming and Scripting
I copy and paste from the book but this thing is not working.
I cannot figure out what is wrong with myline 9.. can someone please tell me
# cat ./sort4.pl
#!/usr/bin/perl -w
use strict;
use warnings;
my $input = shift;
my $output = shift;
open(IN, '<', $input) or die... (4 Replies)
Discussion started by: hankooknara
4 Replies
6. Shell Programming and Scripting
Below program, I do not get why item I am looking for is , instead of .
When I do $#text, i get the right value for $value1, but when I do , i get somsething4, instead of
somsethingxxxxxxxxxxxxxxxxxxx(which is what I am looking for.
when I do , I get empty.. why? what did I do wrong? can you... (2 Replies)
Discussion started by: hankooknara
2 Replies
7. Shell Programming and Scripting
I fail to see how below answer is 1? can someone explain this for me?
DB<3> $string = "The cat sat on the mat";
DB<4> $animal = ($string =~ m/The (.*) sat/);
DB<5> print $animal;
1 (2 Replies)
Discussion started by: hankooknara
2 Replies
8. Shell Programming and Scripting
I have a question regarding bulding a hash from a file which has below pattern
I thought I could write something like this but clearly my syntax is way off
$/ = "\n\n";
$" = "\n";
open(FILE, file1) || die;
my %keymaster = ( );
while (<FILE>) {
my $topinfo =~... (5 Replies)
Discussion started by: hankooknara
5 Replies
9. Shell Programming and Scripting
I am reading a file in perl script .. during the debug the $linein value is :
linein : +ASM1,sys,||¬ |3Æqúoü;”ט||
from this line I am getting the tmepuser and password from above :
($tmpuser, $pwd) = ($linein =~ /^$server\s*,\s*(+)\s*,\|\|(.+)\|\|/sm);
I am getting $tmpuser and... (2 Replies)
Discussion started by: talashil
2 Replies
10. Shell Programming and Scripting
Hello everybody, I am new at the forum and a total newbie when it comes to Unix.
I am trying to see how I can add the ability to kill a user's processes?
I want to add this to my Shel Script Add the code/process into a subroutine.
Also, I would like to use an array to store the list... (0 Replies)
Discussion started by: kinelisch
0 Replies
ckuid(1) User Commands ckuid(1)
NAME
ckuid, erruid, helpuid, valuid - prompts for and validates a user ID
SYNOPSIS
ckuid [-Q] [-W width] [-m] [-d default] [-h help] [-e error] [-p prompt] [ -k pid [-s signal]]
/usr/sadm/bin/erruid [-W width] [-e error]
/usr/sadm/bin/helpuid [-W width] [-m] [-h help]
/usr/sadm/bin/valuid input
DESCRIPTION
The ckuid utility prompts a user and validates the response. It defines, among other things, a prompt message whose response should be an
existing user ID, text for help and error messages, and a default value (which are returned if the user responds with a <RETURN>).
All messages are limited in length to 70 characters and are formatted automatically. Any white space used in the definition (including NEW-
LINE) is stripped. The -W option cancels the automatic formatting. When a tilde is placed at the beginning or end of a message definition,
the default text is inserted at that point, allowing both custom text and the default text to be displayed.
If the prompt, help or error message is not defined, the default message (as defined under NOTES) is displayed.
Three visual tool modules are linked to the ckuid command. They are erruid (which formats and displays an error message), helpuid (which
formats and displays a help message), and valuid (which validates a response). These modules should be used in conjunction with FML
objects. In this instance, the FML object defines the prompt.
OPTIONS
The following options are supported:
-d default Defines the default value as default. The default is not validated and so does not have to meet any criteria.
-e error Defines the error message as error.
-h help Defines the help messages as help.
-k pid Specifies that process ID pid is to be sent a signal if the user chooses to abort.
-m Displays a list of all logins when help is requested or when the user makes an error.
-p prompt Defines the prompt message as prompt.
-Q Specifies that quit will not be allowed as a valid response.
-s signal Specifies that the process ID pid defined with the -k option is to be sent signal signal when quit is chosen. If no signal
is specified, SIGTERM is used.
-W width Specifies that prompt, help and error messages will be formatted to a line length of width.
OPERANDS
The following operand is supported:
input Input to be verified against /etc/passwd.
EXIT STATUS
The following exit values are returned:
0 Successful execution.
1 EOF on input, or negative width on -W option, or usage error.
2 Usage error.
3 User termination (quit).
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
attributes(5)
NOTES
The default prompt for ckuid is:
Enter the login name of an existing user [?,q]:
The default error message is:
ERROR - Please enter the login name of an existing user.
If the -m option is used, the default error message is:
ERROR: Please enter one of the following login names: <List>
The default help message is:
Please enter the login name of an existing user.
If the -m option is used, the default help message is:
Please enter one of the following login names: <List>
When the quit option is chosen (and allowed), q is returned along with the return code 3. The valuid module will not produce any output.
It returns 0 for success and non-zero for failure.
SunOS 5.10 14 Sep 1992 ckuid(1)