Visit Our UNIX and Linux User Community

Extracting substring from variable

Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Extracting substring from variable
# 1  
Old 05-18-2016
Extracting substring from variable

Hi All,

I'm facing issue wherein I have 2 character string like 'CR' and 'DR' and I want to extract just 1st character but am unable to do it. I tried below options but they are returning me 2nd character only,


echo ${var:1}

returns just "R"

echo ${var:0}

returns "CR"

expr substr $var 1 1

doesn't work at my end it.

Any suggestions please.

# 2  
Old 05-18-2016

# 3  
Old 05-18-2016
What shell are you working in?

If it's ksh (and possibly bash too) you can do this sort of thing:-
echo ${var%?}

It looks shocking, but it is slicing the variable up a little. It is called variable substitution and you should be able to get a fuller explanation if you search for that. It would probably not be best if I try to re-write existing documentation.

I hope that this helps,
# 4  
Old 05-18-2016
The one below should work irrespective of shell version...
export var="DR"
echo ${var%"${var#[A-Z]}"}

# 5  
Old 05-18-2016
typeset -L1 var

# 6  
Old 05-19-2016
Thanks alot to all, all the solution mentioned worked.

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Extracting a substring from Line

Hi All I have a line which is as below 1234567 Gagan Paswani zz23432 1000000000 1000000000 ASTHEYXX-RTUC zz23432 I need to extract the first occurence of zz23432 which will have the reg expression as {2}{5} Could you please assist as to how I can extract this... (3 Replies)
Discussion started by: Prashantckc
3 Replies

2. Shell Programming and Scripting

Bash - Extracting whole word containing substring

hello. I get this text when using some command : S | Name | Type | Version | Arch | Repository --+-----------------+---------+---------+------+------------- | AdobeReader_enu | package | 9.5.4-1 | i486 | zypper_local I need to get "AdobeReader_enu" from the the pattern "Ado"... (7 Replies)
Discussion started by: jcdole
7 Replies

3. Shell Programming and Scripting

Help on extracting a substring from the input string

Hi, I am new to Unix. I am trying to extract a substring from an input string: Ex - input string: deploy_v11_9_1 i want to extract and store the value v11_9_1 from the input string in a new variable. I am using following command in my shell script file: echo "Enter the folder name u... (5 Replies)
Discussion started by: Pranav Bhasker
5 Replies

4. Shell Programming and Scripting

Need help in extracting the substring in UNIX

Hi all, I need to extract the "abcdef" from the below string Digital_abcdef_20130103.txt.gz The length of the "abcdef" will be changing but it will be always after the word Digital_ and before the second underscore help in this regard is highly appreciated (3 Replies)
Discussion started by: rithushri
3 Replies

5. UNIX for Dummies Questions & Answers

Extracting substring between pattern only one time

Hello ifconfig return : eth0 Link encap:Ethernet HWaddr 11:24:1D:C1:99:BA inet addr: Bcast: Mask: UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:37307 errors:0 dropped:0 overruns:0 frame:0 ... (2 Replies)
Discussion started by: jcdole
2 Replies

6. Shell Programming and Scripting

Extracting substring

Hi, I have string in variable like '/u/dolfin/in/DOLFIN.PRL_100.OIB.TLU.001.D20110520.T040010' and i want to conevrt this string into only "DOLFIN.PRL_100.OIB.TLU.001.D20110520.T040010" (i.e file name). Is there any command to extracting string in some part ?(rather than whole path)? ... (5 Replies)
Discussion started by: shyamu544
5 Replies

7. Shell Programming and Scripting

Extracting a substring from a string in unix

Hi, I would like to extract a substring from a string in unix. eg: ./ -- i need only from this string. Could someone help me out in this... Regards Arun (19 Replies)
Discussion started by: arunkumarmc
19 Replies

8. Shell Programming and Scripting

Extracting substring from string

Hi awk and sed gurus, Please help me in the following. I have the following entries in the file ABCDErules AbHDPrules ABCrules -- -- and other entries in the file. Now, I want to extract from the file that contain entries for *rules and process it separately. How can i do it... (6 Replies)
Discussion started by: sdosanjh
6 Replies

9. Shell Programming and Scripting

extracting substring from a file name

hi i need to name a file with a substring of a another file name. i.e. if the old filename is abc.txt , the new filename should be abc_1.txt i should get the substring of the file name and then name the new one please let me know how to do it (4 Replies)
Discussion started by: adityamahi
4 Replies

10. UNIX for Dummies Questions & Answers

problem extracting substring in korn shell

hi all, I have read similiar topics in this board, but i didn' t find the posting which is the same with the problem i face.. I try to extract string from the end. i try to do this: num=abcdefghij num2=${num:-5} echo $num2 #this should print the last 5 characters (fghij) but it doesn;t... (3 Replies)
Discussion started by: nashrul
3 Replies

Featured Tech Videos