Visit Our UNIX and Linux User Community

removing new line from the shell variable value

Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers removing new line from the shell variable value
# 1  
Old 10-07-2009
removing new line from the shell variable value

I have a small doubt that, how to chomp the new line from the bash shell variable value.

In perl, i will do chomp, but how to do it in bash -- shell programming.

When i redirect the date output i have a new line in it, which i would want to remove, how to do ?!
# 2  
Old 10-07-2009
Hope this helps,

#! /usr/bin/sh

echo -n $b

# 3  
Old 10-07-2009
Yep, am not going to just use that variable only for echoing.

Actually i would want to use in sed substitution, so how to remove that new line from the variable itself is the question.

Anyway, thanks for this response.
# 4  
Old 10-07-2009
Can you tell me what is the problem in your sed substitution.

Here's whatever I tried.
$ cat a
ASCII text
Wed Oct  7 05:53:51 PDT 2009 Test

$ cat

b=`date -d @1254920031`
sed  "s/${b}//" a

$ sh
ASCII text

It doesn't need chomping. Your case might be different. If you give wider data, it would be better to give solution.
# 5  
Old 10-07-2009
Yep, then it was my misunderstanding while reviewing that script.

Finally, i understood that date will not push newline. Thanks for all your response.
# 6  
Old 10-07-2009
Originally Posted by thegeek
Yep, am not going to just use that variable only for echoing.
If your echo don't support -n option use printf.

Previous Thread | Next Thread
Test Your Knowledge in Computers #791
Difficulty: Easy
Logic gates cannot be used to store data.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to read a two files, line by line in UNIX script and how to assign shell variable to awk ..?

Input are file and file1 file contains store.bal product.bal category.bal admin.bal file1 contains ::FFFF:BADC:CD28,::FFFF:558E:11C5,6,8,2,1,::FFFF:81C8:CA8B,::FFFF:BADC:CD28,1,0,0,0,::FFFF:81C8:11C5,2,1,0,0,::FFFF:81DC:3111,1,0,1,0 store.bal.... (2 Replies)
Discussion started by: veeruasu
2 Replies

2. Shell Programming and Scripting

Use shell variable in perl command line

Hi, I would like to use a shell variable $amp in my perl command line. for fa in $WORKSPACE/*.fa; do amp=`grep ">.*" $fa | sed -e's#>\(.*\)#\1#g'` ampsam="$WORKSPACE/$base/$base.$amp.sam" sqheader=`grep "^@SQ.*SN:$amp.*" $sam` printf "$sqheader\n" >> $ampsam ... (3 Replies)
Discussion started by: jdilts
3 Replies

3. Shell Programming and Scripting

Embeded shell variable in command line

Hello, I know this is a situation about the single quote and double literal, but I could not figure out after many search. I need to loop through thousands of different BACs sequencing to optimize kmer individually. IN=/PATH/TO/INPUT/FILES for sample in S{01..1096} do run_program... (9 Replies)
Discussion started by: yifangt
9 Replies

4. Shell Programming and Scripting

Tabbing a line a variable number of times in shell

Hi, I had another question. I was wondering if there was a way to tab a line a variable number of times in tcsh. To go into details, I want to tab a line by how deep a file is in its path. So here is an example code: set filea=/blah1/blah2/blah3 set fileb=/blah1/blah2/blah3/blah4 set... (4 Replies)
Discussion started by: chu816
4 Replies

5. Shell Programming and Scripting

Removing a line IF the next line contains string

So, I've been working on a project which takes layer 7 metadata from pcap dumps and archives it. However, there is a lot of dataless information that I don't want in my output. I know of ways to produce the output I want from the input file below, but I want a method of doing this, regardless of... (2 Replies)
Discussion started by: eh3civic
2 Replies

6. Shell Programming and Scripting

Perl removing strings from a variable value

Dear all, I have a variable called $abc, which the value is something like below, *** *********** : ***** where * can be anything. I need to remove all but the final characters until last whitespace. example grd groupstudy : tutor6/7 becomes tutor6/7 something like if... (2 Replies)
Discussion started by: tententen
2 Replies

7. Shell Programming and Scripting

Removing a character from a variable and assigning it to another variable?

Hi folks. I have this variable called FirstIN that contains something like this: 001,002,003,004... I am trying to assign the content of this variable into ModifiedIN but with the following format : 001 002 003 004...(changing the commas for spaces) I thought about using sed but i am not... (17 Replies)
Discussion started by: Stephan
17 Replies

8. Shell Programming and Scripting

Removing character ' from a variable

Hello there, I have a variable in the form of '/example/file.txt' . I want to remove the ' characters from the beginning and the end so that the my new variable becomes /example/file.txt . How can I do it in a script? I know this is a fairly easy question, but i wasn't able to implement it. (3 Replies)
Discussion started by: sertansenturk
3 Replies

9. UNIX for Dummies Questions & Answers

removing line and duplicate line

Hi, I have 3 lines in a text file that is similar to this (as a result of a diff between 2 files): 35,36d34 < DATA.EVENT.EVENT_ID.s = "3661208" < DATA.EVENT.EVENT_ID.s = "3661208" I am trying to get it down to just this: DATA.EVENT.EVENT_ID.s = "3661208" How can I do this?... (11 Replies)
Discussion started by: ocelot
11 Replies

10. Shell Programming and Scripting

Removing line breaks from a shell variable

Here is my snippet of code... getDescription() { DESCRIPTION=$(dbaccess dncsdb - << ! 2>/dev/null|sed -e 's/hctt_description//' -e '/^$/ d'|tr -d '\r' select hct_type.hctt_description from hct_type,hct_profile where hct_type.hctt_id=hct_profile.hctt_id and... (5 Replies)
Discussion started by: lyonsd
5 Replies

Featured Tech Videos