Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

grep command and last line

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting grep command and last line
# 1  
Old 03-29-2012
grep command and last line
Hello Dear Friends I have a question about grep command

when I type the command
Code:
grep 'energy' mydata.txt

it gives me

Code:
energy= 5001
energy= 8500
energy= 5505
energy= 5506

however I only want to see the last line. How can I use the grep command to pick the last line of grep output.

Thank You
Last edited by Scrutinizer; 04-05-2012 at 06:16 AM..
# 2  
Old 03-29-2012
Pipe the output into tail.
# 3  
Old 03-29-2012
Quote:
Originally Posted by CarloM
Pipe the output into tail.
I think you couldn't understand my question. my file includes billions of lines. tail is not enough by itself.

first I have to pick some certain lines and than I want to see just the last one.

I think this can be done by just one-line code. But how ?
# 4  
Old 03-29-2012
I didn't mean using tail on its own. What you want is something like:
Code:
grep something wherever | tail -1

'|' is a pipe - the output from grep is being fed into tail.
This User Gave Thanks to CarloM For This Post:
rpf
# 5  
Old 03-29-2012
thank you for rapid response. I need some more information

I have more than one file lets say textA, textB and textC (all of these include some lines of energy)

when I type

Code:
grep 'energy' text* | tail -1

command doesnt show me the last line for each file. It gives just the one line
I need last line (including energy word) of each file ?

can you solve this ?
Last edited by Scrutinizer; 04-05-2012 at 06:18 AM.. Reason: code tags
# 6  
Old 03-29-2012
Code:
for filename in text*; do grep 'energy' $filename | tail -1; done

This User Gave Thanks to CarloM For This Post:
rpf
# 7  
Old 04-05-2012
Hi.. the o/p which is coming is the last line..
Code:
grep energy <file name> | tail -1

Last edited by Scrutinizer; 04-05-2012 at 06:20 AM.. Reason: code tags
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Grep command on multiple line

Hi All, I have some xml files and I need to find out all xml where one specific type of pattern is available.. Pattern 1 ========== <MAP TIMEOUT="" MODE="STANDALONE"> <COMMENT>without Any Mapping</COMMENT> </MAP> Pattern 2 ========== <MAP TIMEOUT="" MODE="STANDALONE"> ... (4 Replies)
Discussion started by: Baharul
4 Replies

2. Shell Programming and Scripting

Grep command to ignore line starting with hyphen

Hi, I want to read a file line by line and exclude the lines that are beginning with special characters. The below code is working fine except when the line starts with hyphen (-) in the file. for TEST in `cat $FILE | grep -E -v '#|/+' | awk '{FS=":"}NF > 0{print $1}'` do . . done How... (4 Replies)
Discussion started by: Srinraj Rao
4 Replies

3. Shell Programming and Scripting

sed command to grep multiple pattern present in single line and delete that line

here is what i want to achieve.. i have a file with below contents cat fileName blah blah blah . .DROP this REJECT that . --sport 7800 -j REJECT --reject-with icmp-port-unreachable --dport 7800 -j REJECT --reject-with icmp-port-unreachable . . . more blah blah blah --dport 3306... (14 Replies)
Discussion started by: vivek d r
14 Replies

4. Shell Programming and Scripting

Command to grep a word and print the whole line splitted into many

Hi, I need to search a word in the java file. Assume the line in the java file is, (the line was splitted into 3 lines) 1.operationContext.sendFeedback(2.FeedbackType.ERROR, null, "Input is empty.", "Input Details: pr 3.ovide Valid pair(s): "+pairType); When i grep for the word... (6 Replies)
Discussion started by: tulasiram
6 Replies

5. UNIX for Dummies Questions & Answers

grep command on a line from a file

Dear forum, Please excuse my ignorance. I have looked through various forum posts and tried various solutions but have not been able to solve my problem. File1.txt consist of a list of 100 names (one per line). File2.txt contains details for 1000 people (one per line), with the first field... (7 Replies)
Discussion started by: beginner0302
7 Replies

6. Shell Programming and Scripting

fetch last line no form file which is match with specific pattern by grep command

Hi i have a file which have a pattern like this Nov 10 session closed Nov 10 Nov 9 08:14:27 EST5EDT 2010 on tty . Nov 10 Oct 19 02:14:21 EST5EDT 2010 on pts/tk . Nov 10 afrtetryytr Nov 10 session closed Nov 10 Nov 10 03:21:04 EST5EDT 2010 Dec 8 Nov 10 05:03:02 EST5EDT 2010 ... (13 Replies)
Discussion started by: Himanshu_soni
13 Replies

7. UNIX for Dummies Questions & Answers

Can grep command return word instead of complete line

Hi Is there any way GREP command can return word and not complete line. My file has following data: Hello Everyone I am NitinrajSrivastava Hi Friends Welcome VrajSrivastava I am using grep 'raj' which is returning me complete line.However I want only the word having keyword 'raj'. Required... (11 Replies)
Discussion started by: dashing201
11 Replies

8. UNIX for Dummies Questions & Answers

grep line command

Hi, Can anyone translate in words what this line command does: ls *.fits | grep -v "Zero\|zero" > objlist Obviously ls *.fits means to list all the fits file, grep looks for a certain word, Zero is a certain fits file, and > objlist , created a list with certain items, but I am not sure what... (3 Replies)
Discussion started by: cosmologist
3 Replies

9. Shell Programming and Scripting

Grep using line command

Hello I have a pretty big problem here. I have a very large file having lines running into millions. A small sample of the data is shown below <CRMSUB:MSIN=5000000013,BSNBC=TELEPHON-55108663-TS11&TS21&TS22,MSCAT=ORDINSUB,SUBRES=ALLPLMN-AIRSIMLA,BAOC=OIC,NUMTYP=MULTI;... (3 Replies)
Discussion started by: PradeepRed
3 Replies

10. Shell Programming and Scripting

diffrent results between command line and scripted grep

When I type a command at the command line it supplies one result and the exact same command in a script egrep '^01|^02|^03|^04' file > fileout count = 29353 same count in the script yields a count of 23492 is there any reason this could be happening. (1 Reply)
Discussion started by: r1500
1 Replies
Login or Register to Ask a Question