Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: trouble with: read -d '\r'
Top Forums Shell Programming and Scripting trouble with: read -d '\r' Post 302361019 by HowardL on Monday 12th of October 2009 02:37:05 AM
Old 10-12-2009
Thanks for the reply.
I am comfortable with the first method you posted.

But I can't figure out how the second is supposed to work.
Code:
IFS=$' \t\r\n' read < xf1

# ...for example I tried thing like this:
~>  s="woxrd";  echo "${s/x/$'\r'}" > xf1;  hexdump -C xf1;
00000000  77 6f 0d 72 64 0a                                 |wo.rd.|

~>  IFS= ; REPLY= ;  IFS=$' \t\r\n' read < xf1

~>  echo  -e "${IFS}" > xf2

~>  hexdump -C xf2
00000000  0a                                                |.|

~>  echo "${REPLY}"
rd

...and I don't get what I'm supposed to be doing with that... Is IFS some special variable?

I also wondered if it was possible to assign a \r right into a string:
Code:
~>  echo "String of $'\x0d' words"
String of $'\x0d' words

~>  echo "String of $'\r' words"
String of $'\r' words

There sure are a lot of in's and out's with shell scripting aren't there.
Thanks, Howard();

---------- Post updated at 02:37 AM ---------- Previous update was at 01:52 AM ----------

Ah! I see a little more now as far as assignment goes:
Code:
~>  s=$'abcde\a\t\rfghi'

~>  echo -e "${s}" > xf2

~>  hexdump -C xf2
00000000  61 62 63 64 65 07 09 0d  66 67 68 69 0a           |abcde...fghi.|

~>  echo -e "${s}"
fghie

# cool!

Last edited by HowardL; 10-12-2009 at 03:49 AM..
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

The trouble about SU ...

Hi all, having read lots of posts about SU I don't quiet understand this : I'm doing regular backups of my database (u betta do) and therefore use su - username -c "sqlscript special data_base" in a unixscript which is even using cron. (yep!) Now I need some other script, still with this... (4 Replies)
Discussion started by: nulnul7
4 Replies

2. Solaris

Trouble with tr

I'm not sure where to post this but it's happening on a SunOS 5.8 server so I'll try here. I've discovered some unexpected behavior when using tr. For example: echo a | tr Z echo b | tr a echo a | tr B echo a | tr B echo a | tr A (8 Replies)
Discussion started by: Mike@Work
8 Replies

3. UNIX for Dummies Questions & Answers

X trouble

Hi there, I'm new to unix-environments. I'm richard, and i'm mostly a web-developer, under php. I've done work in unix env before, but never had my own. Today, I've got debian 3.1 r4 from the official site, and i've attempted to install it twice. I installed it initially as "Desktop... (0 Replies)
Discussion started by: izua
0 Replies

4. UNIX for Dummies Questions & Answers

trouble using read to store values in variables from command output

I know there are caveats about using read in pipelines because read is treated by a subshell. I know this but I can't think of any way to accomplish this regardless, I'm still a rookie. I hope somebody will be able to interpret what it is that I'm trying to accomplish and correct me. ... (2 Replies)
Discussion started by: ProGrammar
2 Replies

5. Programming

Cannot read a file with read(fd, buffer, buffersize) function

# include <stdio.h> # include <fcntl.h> # include <stdlib.h> # include <sys/stat.h> int main(int argc, char *argv) { int fRead, fPadded, padVal; int btRead; int BUFFSIZE = 512; char buff; if (argc != 4) { printf ("Please provide all of the... (3 Replies)
Discussion started by: naranja18she
3 Replies

6. UNIX for Advanced & Expert Users

read() wont allow me to read files larger than 2 gig (on a 64bit)

Hi the following c-code utilizing the 'read()' man 2 read method cant read in files larger that 2gig. Hi I've found a strange problem on ubuntu64bit, that limits the data you are allowed to allocate on a 64bit platform using the c function 'read()' The following program wont allow to allocate... (14 Replies)
Discussion started by: monkeyking
14 Replies

7. Shell Programming and Scripting

Read Embedded Newline characters with read (builtin) in KSH93

Hi Guys, Happy New Year to you all! I have a requirement to read an embedded new-line using KSH's read builtin. Here is what I am trying to do: run_sql "select guestid, address, email from guest" | while read id addr email do ## Biz logic goes here done I can take care of any... (6 Replies)
Discussion started by: a_programmer
6 Replies

8. UNIX for Dummies Questions & Answers

When reading a csv file, counter to read 20 lines and wait for minute then read next 20 till end

Hello All, i am a newbie and need some help when reading a csv file in a bourne shell script. I want to read 10 lines, then wait for a minute and then do a reading of another 10 lines and so on in the same way. I want to do this till the end of file. Any inputs are appreciated ... (3 Replies)
Discussion started by: victor.s
3 Replies

9. Shell Programming and Scripting

Help with Bash piped while-read and a read user input at the same time

Hi I am new to writing script and want to use a Bash Piped while-read and read from user input. if something happens on server.log then do while loop or if something happend on user input then do while loop. Pseudocode something like: tail -n 3 -f server.log | while read serverline || read... (8 Replies)
Discussion started by: MyMorris
8 Replies

10. Shell Programming and Scripting

[Bash] Read History function & Read Arrowkeys

Hi. How can I create a history function? (By "read" command or so) & How can I configure a read command so that the arrow keys are not displayed so funny? (^[[A) Thanks in advance. (4 Replies)
Discussion started by: sinnlosername
4 Replies

LEARN ABOUT SUSE

installsieve

INSTALLSIEVE(1) 					      General Commands Manual						   INSTALLSIEVE(1)

 *

NAME

       installsieve - user utility for managing sieve scripts

SYNOPSIS

       installsieve

DESCRIPTION

       installsieve is a utility that allows users to manage their sieve scripts kept on the server.

OPTIONS

       -v <name> View script with the given name. The script if retrieved sucessfully is output to standard output.

       -l  List  all  of  the scripts currently on the server. If one of the scripts is active a arrow is printed indicating that it is the active
       script.

       -p <port> Port to connect to. If left off this defaults to "sieve" as defined in /etc/services.

       -i <file> Install a file onto the server. If a script with the same name already exists on the server it is overwritten.  Upon  sucessfully
       putting	the  script on the server the script is set active. If <file> has the extension .script it is chopped when put on the server since
       sieve names may not contain a '.'.

       -a <name> Set <name> as the active script. The list of available names can be obtained from the '-l' option..

       -d <name> Delete the sieve script on the server with <name>.

       -m <mechanism> Force installsieve to use <mechanism> for authentication. If not specified the strongest authentication mechanism is chosen.

       -g <name> Get the sieve script with <name> and save it to disk with a ".script" extension. If a file with that name already  exists  it	is
       overwritten.

       -u <user> Userid/Authname to use for authentication; by default, the current user.

CMU
								   Project Cyrus						   INSTALLSIEVE(1)
All times are GMT -4. The time now is 08:05 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy