Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Unix user ID's case-sensitive?
Top Forums UNIX for Dummies Questions & Answers Unix user ID's case-sensitive? Post 45055 by Perderabo on Sunday 14th of December 2003 06:02:24 PM
Old 12-14-2003
This is actually a difficult question. My answer is that I would never depend on being able to create two accounts like daveb and daveB. And as a system admininistrator I would prohibit it on all systems that I administer. But as a programmer, I would insure that programs work correctly iif two such accounts are encountered.

Neo mentions mail and that is correct. Internet mail must ignore case and so daveb@xyz.org and daveB@xyz.org are the same address. The mail problem would not be impossible to solve but it would be very hard. One of the accounts will need an external mail address that doesn't match the user name. This may require writing a custom delivery agent. I suspect that "mailx Neo" and "mailx neo" would both work. But if it doesn't work, I certainly would not want to call the vendor and complain. And in any case, "mailx neo@localhost" and "mailx Neo@localhost" could not both work.

I'm dating myself here, but terminals originally were not multicase. They were upper case only. Unix had support for that environment. It is mostly gone, but some versions still have various pieces left. On HP-UX, if you sign on as DAVEB, the system will assume that you meant daveb and that you are using a terminal that cannot handle lower case.

Because of these problems, many adduser programs will disallow this sort of thing. But if you manually edit the passwd file, you will probably succeed in getting it to work.

So don't do that, you will regret it. But don't assume that no one else has done it. And be aware that many programmers have assumed that no one has done it.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Is Hostname Case sensitive ?????

Hello users, I have a question ? I was just wondering whether the hostname on unix systems are case sensitive. For example in the system which I work. ping TestHost and ping testhost gives me the same output i.e I get the reply from the remote host Is this applicable for all... (3 Replies)
Discussion started by: ajphaj
3 Replies

2. UNIX for Dummies Questions & Answers

how to disable case sensitive on RHEL ?

Hi all, Im newbie, can i disable case sensitive on RHEL environment, and how? Thank you. (2 Replies)
Discussion started by: blesets
2 Replies

3. Shell Programming and Scripting

Ignore case sensitive in Case Switch

In a Case switch, how to ignore case sensitive in the test: e.g. case "$field" in "TEST) action1;; *) action2;; esac How to go in action1 in case of $field = TEST , or Test , or test or .... without enumerating all possibilities... Thanks,... (1 Reply)
Discussion started by: annelisa
1 Replies

4. Solaris

Tcp_conn_req_max_q (CASE-sensitive?)

I was instructed by my superior to change kernel parameter, adding up this parameter to /etc/system. Server is Solaris 10 on SPARC. Tcp_conn_req_max_q 1024In my Google search, all I know that the sentence is in small case (tcp_conn_req_max_q) but as you can see above, instruction given... (4 Replies)
Discussion started by: Olli.Lang
4 Replies

5. UNIX for Dummies Questions & Answers

How to take parameters as non case sensitive

Is there a way for me to take a parameter then store it in a variable and use its value as non case sensitive? Ex. Lets say i have a parameter which contains "Hey". Then im gonna store it to GR using GR=$1. CL=/install/$GR.g How can i make GR non case sensitive so that the... (1 Reply)
Discussion started by: khestoi
1 Replies

6. UNIX for Advanced & Expert Users

find iname is being case sensitive

Can someone please tell me why iname is being case sensitive with this? $ find /media -iname *load* 2>/dev/null /media/Part 2/stuff/Downloads /media/Part 1/Application Data/Mozilla/Firefox/Profiles/wnul4kj4.irc/chatzilla/downloads /media/Part 1/Bob_5-22-2010/Application... (5 Replies)
Discussion started by: cokedude
5 Replies

7. Shell Programming and Scripting

Case sensitive awk file split

Hello all, This is my first thread so please let me know if I am doing anything wrong or not following etiquette. I have an input file that looks like 123a12345 345a12445 245a66792 245A12345 215A23566 and I want output files that look like a.txt 123a12345 345a12445 245a66792 ... (7 Replies)
Discussion started by: monstrousturtle
7 Replies

8. Shell Programming and Scripting

Case sensitive in If loop .

Hi All, select app from the menu: ABC DEF GHI JKL ALL # ALL will select all the apps in the menu echo "Enter your option" read option; if then <execute the below command> elif # option is the 1 selection from menu...not ALL <execute the below command> else (14 Replies)
Discussion started by: Devaraj A
14 Replies

9. Shell Programming and Scripting

Repeated lines-case sensitive

Hi, users file contains below names i have a requirement to keep only one case sensitive user. For e.g if user name is "aaa" then only aaa should be there in the file and other matching users(AAA,aaA) should be deleted. Tried multiple options but no luck can you please help. aaa abc AAA... (2 Replies)
Discussion started by: Satyak
2 Replies

10. Shell Programming and Scripting

Please help me in using case sensitive command

Hello All, Please help me with this I need to create a cronjob that should delete all files which are older than 30days with '*.txt' and should not delete files with '*TEST*.txt' either file name TEST is upper or test lower case sensitive here's the script /DIR -type f -name '*.txt'... (7 Replies)
Discussion started by: krish_007
7 Replies

LEARN ABOUT SUSE

calibre-smtp

CALIBRE-SMTP(1) 						      calibre							   CALIBRE-SMTP(1)

NAME

       calibre-smtp - part of calibre

SYNOPSIS

       calibre-smtp  [options] [from to text]

DESCRIPTION

       Send  mail using the SMTP protocol. calibre-smtp has two modes of operation. In the compose mode you specify from to and text and these are
       used to build and send an email message. In the filter mode, calibre-smtp reads a complete email message from STDIN and sends it.

       text is the body of the email message.  If text is not specified, a complete email message is read from STDIN.  from is the  email  address
       of the sender and to is the email address of the recipient. When a complete email is read from STDIN, from and to are only used in the SMTP
       negotiation, the message headers are not modified.

       Whenever you pass arguments to calibre-smtp that have spaces in them, enclose the arguments in quotation marks.

OPTIONS

       --version
	      show program's version number and exit

       -h, --help
	      show this help message and exit

       -l, --localhost
	      Host name of localhost. Used when connecting to SMTP server.

       -o, --outbox
	      Path to maildir folder to store failed email messages in.

       -f, --fork
	      Fork and deliver message in background. If you use this option, you should also use --outbox to handle delivery failures.

       -t, --timeout
	      Timeout for connection

       -v, --verbose
	      Be more verbose

   COMPOSE MAIL
       Options to compose an email. Ignored if text is not specified

       -a, --attachment
	      File to attach to the email

       -s, --subject
	      Subject of the email

   SMTP RELAY
       Options to use an SMTP relay server to send mail. calibre will try to send the email directly unless --relay is specified.

       -r, --relay
	      An SMTP relay server to use to send mail.

       --port Port to connect to on relay server. Default is to use 465 if encryption method is SSL and 25 otherwise.

       -u, --username
	      Username for relay

       -p, --password
	      Password for relay

       -e, --encryption-method
	      Encryption method to use when connecting to relay. Choices are TLS and SSL. Default is TLS.

SEE ALSO

       The User Manual is available at http://calibre-ebook.com/user_manual

       Created by Kovid Goyal <kovid@kovidgoyal.net>

calibre-smtp (calibre 0.6.53)					     July 2010							   CALIBRE-SMTP(1)
All times are GMT -4. The time now is 01:00 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy