Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Extract some characters with SED or AWK

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Extract some characters with SED or AWK
# 1  
Old 08-26-2008
Question Extract some characters with SED or AWK
Hi,

I have the following example string:

today_is_a_good_day.txt

The character "_" inside the string can sometimes be more or less. The solution for every string equal the count of "_" should be alway the rest after the last underline character.

Result: day.txt

I want to use awk or sed inside a shell script. Any ideas? Smilie

Thanks
climber
# 2  
Old 08-26-2008
echo "today_is_a_good_day.txt" | awk -F"_" '{ print $NF }'
# 3  
Old 08-26-2008
With sed:

Code:
sed 's/.*_\(.*\)/\1/'

Regards
# 4  
Old 08-26-2008
Thanks for your really quick answers :-)

climber
# 5  
Old 08-26-2008
If the string is inside a variable, you can also do :
Code:
> var=today_is_a_good_day.txt
> echo ${var##*_}
day.txt
>

Jean-Pierre.
# 6  
Old 08-26-2008
Code:
# s=today_is_a_good_day.txt
# IFS=_
# set -- $s
# eval echo \$$#
day.txt

Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

sed or awk grep, that will only get the line with more characters.

Is there a command for sed and awk that will only sort the line with more characters? #cat file 123 12345 12 asdgjljhhho bac ss Output: asdgjljhhho #cat file2 11.2 12345.00 21.222 12345678.10 (2 Replies)
Discussion started by: invinzin21
2 Replies

2. Shell Programming and Scripting

Deleting characters with sed,perl,awk

Input: :: gstreamer :: xine-lib :: xine-lib-extras Output should be: gstreamer xine-lib xine-lib-extras How can it be done with sed or perl? (12 Replies)
Discussion started by: cola
12 Replies

3. Shell Programming and Scripting

Awk to extract lines with a defined number of characters

This is my problem, my file (file A) contains the following information: Now, I would like to create a file (file B) containing only the lines with 10 or more characters but less than 20 with their corresponding ID: Then, I need to compare the entries and determine their frequency. Thus, I... (7 Replies)
Discussion started by: Xterra
7 Replies

4. Shell Programming and Scripting

awk and sed, how to exclude certain characters

Hello everyone: I have ran into this a few times now where my skills are just not up to snuff when it comes to Unix. So, I came here to find some beard stroking Unix wizard to help me. Basically, I am using OS X 10.5 in large scale at work and sometimes I have to run some custom reports. ... (5 Replies)
Discussion started by: tlarkin
5 Replies

5. Shell Programming and Scripting

Awk , Sed Print last 4 numeric characters

Hello All, I have been searching and trying this for a bit now. Can use some assistance. Large 5000 line flat file. bash, rhel5 Input File Sinppet: Fri Oct 30 09:24:02 EDT 2009 -- 1030 Fri Oct 30 09:26:01 EDT 2009 -- 73 Fri Oct 30 09:28:01 EDT 2009 -- 1220 Fri Oct 30 09:30:01 EDT... (9 Replies)
Discussion started by: abacus
9 Replies

6. Shell Programming and Scripting

Sed and awk backslash characters

Hi, I have a variable read from user input: PROFILESROOTDIR="\\194.185.82.188\CMSRepository\EncodingProfiles" awk -F"=" -v gr=$PROFILESROOTDIR '/ProfilesRootDirectoryFromXOEMachine/{$2=gr;}1' OFS="=" $CFGFILE > "${CFGFILE}_new" For this awk to work properly I need to replace in the... (7 Replies)
Discussion started by: potro
7 Replies

7. Shell Programming and Scripting

extract using sed/awk - need help? Please!!

Need help..not sure how to use with awk or sed I want to take data from the notification.$$ file and assign the data to variable "group". Not sure how to do it. The data I want to extract from the notification.$$ is on the first line of the file ..right after the (notice): NetWorker... (5 Replies)
Discussion started by: gzs553
5 Replies

8. Shell Programming and Scripting

SED to extract characters

Hi, Please let me know how do we write a piece of code to extract characters from a line using SED. (1 Reply)
Discussion started by: Shilpi
1 Replies

9. Shell Programming and Scripting

SED to extract characters

Hi, Please let me know how do we write a piece of code to extract characters from a line using SED. (2 Replies)
Discussion started by: Shilpi
2 Replies

10. Shell Programming and Scripting

awk/sed with special characters

i have this script that searches for a pattern. However it fails if the pattern includes some special characters. So far, it fails with the following strings: 1. -Cr 2. $Mj 3. H'412 would a sed or awk be more effective? i don't want the users to put the (\) during the search (they... (5 Replies)
Discussion started by: apalex
5 Replies
Login or Register to Ask a Question