Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

A question about the newline character in KornShell scripts

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting A question about the newline character in KornShell scripts
# 1  
Old 03-20-2009
A question about the newline character in KornShell scripts
Dear all,

How can we know in a KornShell script reading a value from the standard input, that the entered value is the newline character? because as far as I know we cannot use \n for pattern matching. For example:

Code:
#!/bin/ksh

print -n "enter your value: "
read VALUE

if [[ $value = # Here I want to write some pattern to match the newline character ]]
then
    print "you entered the newline character"
else
    print "you didn't enter the newline character"
fi

Thanks in advance,
Smilie
# 2  
Old 03-20-2009
Code:
echo $value | grep -Eq '\n'
if [[ $? -eq 0 ]] ...

But your code won't work with that, since a newline will tell read to end input, and the newline isn't saved to the variable.
# 3  
Old 03-20-2009
Quote:
Originally Posted by pludi
Code:
echo $value | grep -Eq '\n'
if [[ $? -eq 0 ]] ...

But your code won't work with that, since a newline will tell read to end input, and the newline isn't saved to the variable.
Yes, you are right about the fact that \n is eliminated from the end of the input by the read function. However even after running
Code:
...
echo $value | grep -Eq '\n'
...

$? is 1 and not 0, I don't understand why
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to remove newline character if it is the only character in the entire file.?

I have a file which comes every day and the file data look's as below. Vi abc.txt a|b|c|d\n a|g|h|j\n Some times we receive the file with only a new line character in the file like vi abc.txt \n (8 Replies)
Discussion started by: rak Kundra
8 Replies

2. Shell Programming and Scripting

Remove last newline character..

Hi all.. I have a text file which looks like below: abcd efgh ijkl (blank space) I need to remove only the last (blank space) from the file. When I try wc -l the file name,the number of lines coming is 3 only, however blank space is there in the file. I have tried options like... (14 Replies)
Discussion started by: Sathya83aa
14 Replies

3. Shell Programming and Scripting

replacing by newline character

I have a file (pema)with a single long record which i have to break up into multiple lines Input s1aaaaaaaaaaaaaaaaaaaaaaas1bbbbbbbbbbs1cccccccccc Output s1aaaaaaaaaaaaaaaaaaaaaaa s1bbbbbbbbbb s1cccccccccc m planning to do it by replacing s1 by \ns1 \n is the new line character i... (5 Replies)
Discussion started by: pema.yozer
5 Replies

4. UNIX for Dummies Questions & Answers

newline character in a variable

variable="unix\nlinux" echo $variable expected output: unix linux :wall: can i do that ?? thanks in advance!! (3 Replies)
Discussion started by: sathish92
3 Replies

5. Shell Programming and Scripting

Why SED can't see the last newline character?

Removed. My question does not make sense. and SED does see the last newline character. But I still have a question: How to remove the last newline character(the newline character at the end of last line) using SED? ---------- Post updated 05-01-11 at 10:51 AM ---------- Previous update was... (7 Replies)
Discussion started by: kevintse
7 Replies

6. Shell Programming and Scripting

Kornshell gathering user input question

Alright I have a function that does a bunch of commands and then I ask the user for what type of node they are on. So determining which node they are on means they will run a different function. Whats the correct syntax for that? function everything { echo "do stuff" }... (10 Replies)
Discussion started by: Blogger11
10 Replies

7. Shell Programming and Scripting

Remove newline character conditionally

Hi All, I have 5000 records like this Request_id|Type|Status|Priority|Ticket Submitted Date and Time|Actual Resolved Date and Time|Current Ticket Owner Group|Case final Ticket Owner Group|Customer Severity|Reported Symptom/Request|Component|Hot Topic|Reason for Missed SLA|Current Ticket... (2 Replies)
Discussion started by: j_53933
2 Replies

8. UNIX for Dummies Questions & Answers

echo without newline character

hi, I have a for loop where in I write some file name to another file. I want to write all the filenames to another without any newlines. how can i avoid getting new lines with echo? Thanks, Srilaxmi (2 Replies)
Discussion started by: srilaxmi
2 Replies

9. UNIX for Dummies Questions & Answers

newline character

hi, I want to print the below lines "Message from bac logistics The Confirmation File has not been received." When i give like this in the code "Message from bac logistics\n The Confirmation File has not been received." It is giving only Message from bac logistics\n The... (9 Replies)
Discussion started by: trichyselva
9 Replies

10. UNIX for Dummies Questions & Answers

How can I replace newline character?

Hi, I am trying to write a script to prepare some text for use as web content. What is happening is that all the newlines in the textfile are ignored, so I want to be able to replace/add a few characters so that for a file containg: This is line 1. This is line two. This is line four.... (1 Reply)
Discussion started by: ghoti
1 Replies
Login or Register to Ask a Question