Extract a substring from a file


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Extract a substring from a file
# 1  
Old 07-25-2014
Extract a substring from a file

Hello,
A question please.
A have a file that contains a string. Ex:
Code:
AAAABBCCCCCDDEEEEEEEEEEFF

I'd want to recover 2 substrings, 'BB' and 'FF' and then leave them in a new file.
From position 5, 2 caracters (ex:"BB") and from position 25, 2 caracters (ex:"FF") in a file.
Could anoyone help me please?
Thanks in advance

Moderator's Comments:
Mod Comment Use code tags!

Last edited by radoulov; 07-25-2014 at 02:04 PM..
# 2  
Old 07-25-2014
Please use code tags as required by forum rules!

How about counting your chars correctly? Try
Code:
cut -c5-6,24-25 file
BBFF
awk '{print substr($0, 5, 2)substr($0, 24, 2)}' file
BBFF

Redirect to new file (> newfile) if happy.
# 3  
Old 07-25-2014
Thanks!
I will use
Code:
cut -c5-6,24-25 file

and for

Code:
"FF" "BB" ?

I need to add a constant in the beginning too.

thanks
# 4  
Old 07-25-2014

If your file only has one line, you don't need any external commands:

read line < file

Then use parameter expansion to get the characters you want:

Code:
# bash
printf "%s%s\n" "${line:4:2}" "${line:23:2}"


Code:
# POSIX
temp=${line#????}
s1=${temp%${temp#??}}
temp=${line#???????????????????????}
s2=${temp%${temp#??}}
printf "%s%s\n" "$s1" "$s2"

Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Extract substring in a file

Hello, A question please. A have a file that contains a string. Ex: AAAABBCCCCCDDEEEEEEEEEEFF I'd want to recover 2 substrings, 'BB' and 'FF' and then leave them in a new file. Could anoyone help me please? Thanks in advance (3 Replies)
Discussion started by: nolo41
3 Replies

2. Shell Programming and Scripting

Extract substring specif position and length from file line

Hi gurus, I am trying to figure out how to extract substring from file line (all lines in file), as specified position and specified legth. Example input (file lines) dhaskjdsa dsadhkjsa dhsakjdsad hsadkjh dsahjdksahdsad sahkjd sahdkjsahd sajkdh adhjsak I want to extract substring on... (5 Replies)
Discussion started by: ProsteJa
5 Replies

3. Shell Programming and Scripting

Regex: Extract substring between 2 separator

Hi Input: aa-bb-cc-dd.ee.ff.gg Output: dd I want to get the word after the last '-' until the first dot I have tried with regex lookbehind and lookahead like this: (?<=-).*(?=\.) but his returns too much bb-cc-dd.ee.ff (7 Replies)
Discussion started by: chitech
7 Replies

4. Shell Programming and Scripting

Extract a substring using SED/AWK

Hi All, I have a log file in which name and version of applications are coming in the following format name It may look like following, based on the name of the application and version: XYZ OR xyz OR XyZ OR xyz I want to separate out the name and version and store them into variables.... (4 Replies)
Discussion started by: bhaskar_m
4 Replies

5. Shell Programming and Scripting

How to extract a substring from a string

Hi, I have an input string say for example: ABC,DEF,IJK,LMN,...,XYZ The above string is comma delimited. Now I have to extract the last part after the comma i.e. XYZ. :b: (3 Replies)
Discussion started by: bghosh
3 Replies

6. Solaris

Extract substring from a string

i have srtring i.e. "NAME,CLASS,AGE" (length of string is not constant) and from this string i've extract each word delimited by "," (comma). INPUT: "NAME,CLASS,AGE" OUTPUT: NAME CLASS AGE how can i do that? i have tried some string manipulation function like... (5 Replies)
Discussion started by: jadoo_c2
5 Replies

7. Shell Programming and Scripting

Extract a substring.

I have a shell script that uses wget to grab a bunch of html from a url. URL_DATA=`wget -qO - "$URL1"` I now have a string $URL_DATA that I need to pull a substring out of..say I had the following in my string <p><a href="/scooby/929011567.html">Dog pictures check them out! -</a><font... (3 Replies)
Discussion started by: shellpower
3 Replies

8. Shell Programming and Scripting

Need Help... to extract the substring

> tnsping $TWO_TASK | grep HOST Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 10.12.10.212)(PORT = 1540)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = OMTST15))) I want to extract like this HOST = 10.12.10.212 PORT = 1540 SERVICE_NAME = OMTST15 I... (4 Replies)
Discussion started by: dashok.83
4 Replies

9. Shell Programming and Scripting

Sed extract substring on (OS X)

On OS 10.4.11 I have filenames like: 670711 SA T2 v1-1_DS_EF.doc CT_670520 AM T1 v1-2_DS_EF.doc CT_670716 - 2 SA T4 v1-2_DS_EF.doc CT_670713 SA T3 v1-1_DS_EF.doc 670421 PA DYP1 v1-1_DS_EF.doc CT_670425 PA DYP2 v1-1_DS_EF.doc CT_670107 RA T3 v1-2_DS_EF.doc CT_670521 AM T2 v1-2_DS_EF.doc... (3 Replies)
Discussion started by: mlommel
3 Replies

10. UNIX for Dummies Questions & Answers

how to extract a substring froma file

hi all, I'm really newbie on this and I need some help. how is the best way to extract a strig or substring from a each line in a file. e.g. I want to print only this ERROR=JUD+the followed numbers from one line like this one, considering the numbers change related to different errors ... (1 Reply)
Discussion started by: morena
1 Replies
Login or Register to Ask a Question