Visit The New, Modern Unix Linux Community


How to use sed to search for string and Print previous two lines and current line


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting How to use sed to search for string and Print previous two lines and current line
# 1  
How to use sed to search for string and Print previous two lines and current line

Hello,

Can anybody help me to correct my sed syntax to find the string and print previous two lines and current line and next one line.

i am using string as "testing"

netstat -v | sed -n -e '/test/{x;2!p;g;$!N;p;D;}' -e h

i am able to get the previous line current line next line but unable to print the previous to previous line not able to get.

i.e.

this line to print
this line to print
test:This line to print
this line to print.

Can anybody help me


Madhu
# 2  
With awk:

Code:
awk '/test/ {
  print a[NR%2] "\n" a[(NR+1)%2]
  print;getline;print;getline;exit
}
{a[NR%2]=$0}
' file

Regards

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #72
Difficulty: Easy
The 'Unix philosophy' is a computer design philosophy based on creating small, modular utilities that do one thing and do them well.
True or False?

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

How to find a string in a line in UNIX file and delete that line and previous 3 lines ?

Hi , i have a file with data as below.This is same file. But actual file contains to many rows. i want to search for a string "Field 039 00" and delete that line and previous 3 lines in that file.. Can some body suggested me how can i do using either sed or awk command ? Field 004... (7 Replies)
Discussion started by: vadlamudy
7 Replies

2. Shell Programming and Scripting

String search and print next all lines in one line until blank line

Dear all I want to search special string in file and then print next all line in one line until blank lines come. Help me plz for same. My input file and desire op file is as under. i/p file: A1/EXT "BSCABD1_21233G1" 757 130823 1157 RADIO X-CEIVER ADMINISTRATION BTS EXTERNAL FAULT ... (7 Replies)
Discussion started by: jaydeep_sadaria
7 Replies

3. Shell Programming and Scripting

Search string and print the above line and below lines?.

if the first string matches then print the previous line and current line and also print the following lines if the other string search matches. Input ------ TranTime 2012 10 12 The Record starts here Accountnumber: 4632473431274 TxnCode 323 TranID 329473242834 ccsdkcnsdncskd... (7 Replies)
Discussion started by: laknar
7 Replies

4. Shell Programming and Scripting

Sed Comparing Parenthesized Values In Previous Line To Current Line

I am trying to delete lines in archived Apache httpd logs Each line has the pattern: <ip-address> - - <date-time> <document-request-URL> <http-response> <size-of-req'd-doc> <referring-document-URL> This pattern is shown in the example of 6 lines from the log in the code box below. These 6... (1 Reply)
Discussion started by: Proteomist
1 Replies

5. Shell Programming and Scripting

print range of lines matching pattern and previous line

Hi all, on Solaris 10, I'd like to print a range of lines starting at pattern but also including the very first line before pattern. the following doesn't print the range starting at pattern and going down to the end of file: cat <my file> | sed -n -e '/<pattern>{x;p;}/' I need to include the... (1 Reply)
Discussion started by: siriche
1 Replies

6. UNIX for Dummies Questions & Answers

Awk to print data from current and previous line

Hi guys, I have found your forum super useful. However, right now I am stuck on a seemingly "simple" thing in AWK. I have two columns of data, the first column in Age (in million years) and the second column is Convergence Rate (in mm/yr). I am trying to process my data so I can use it to... (2 Replies)
Discussion started by: awk_noob_456
2 Replies

7. Shell Programming and Scripting

Print lines after the search string until blank line is found

All I want is to look for the pattern in the file...If I found it at # places... I want print lines after those pattern(line) until I find a blank line. Log EXAMPLE : MT:Exception caught The following Numbers were affected: 1234 2345 2346 Error java.lang.InternalError:... (3 Replies)
Discussion started by: prash184u
3 Replies

8. Shell Programming and Scripting

Append specific lines to a previous line based on sequential search criteria

I'll try explain this as best I can. Let me know if it is not clear. I have large text files that contain data as such: 143593502 09-08-20 09:02:13 xxxxxxxxxxx xxxxxxxxxxx 09-08-20 09:02:11 N line 1 test line 2 test line 3 test 143593503 09-08-20 09:02:13... (3 Replies)
Discussion started by: jesse
3 Replies

9. Shell Programming and Scripting

Search for a pattern in a file and print previous lines from a particular point

Hi, I am new to ksh scripting and I have a problem. I have a file in which I have to search for a particular pattern say 'a' then from that line I need to search for another pattern say 'b' in the previous lines and thne print the file from pattern 'b' till the end of file. For eg: ... (2 Replies)
Discussion started by: umaislearning
2 Replies

10. Shell Programming and Scripting

Print previous, current and next line using sed

Hi, how can i print the previous, current and next line using sed? current line is the matching line. The following prints all lines containing 'Failure' and also the immediate next line cat $file | sed -n -e '/Failure/{N;p;}' Now, i also want to print the previous line too. Thanks,... (8 Replies)
Discussion started by: ysrinu
8 Replies

Featured Tech Videos