Login or Register to Ask a Question and Join Our Community


UNIX for Dummies Questions & Answers

Help needed in Appending multiple lines

 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers Help needed in Appending multiple lines
# 1  
Old 10-20-2011
Help needed in Appending multiple lines
Hello,

There is a log file A.log where new lines are getting added every minute.

When ever any new lines are getting added in to A , the same lines needs to be appended to B.log

I need to append these newly added lines to end of another file B through a shell script. I tried CAT but its appending the entire content and not the latest lines.

How we can do these without appending the entire content from file A to file B.
# 2  
Old 10-20-2011
Code:
#
# one way could be ....
#
tail -f A.log | tee -a B.log

Last edited by Franklin52; 10-21-2011 at 09:24 AM.. Reason: Correcting code tags
# 3  
Old 10-20-2011
Not to quibble, but shouldn't that be:

Code:
tail -f A.log >> B.log

otherwise, every new line would be also sent to stdout.

How is A.log being created? As an option to some command? Or redirected stdout?
 
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Appending multiple files through UNIX

Hi All, I have requirement where multiple csv files are present in a directory and each file contains a header.I need to append the contents of all the files into one file by removing header. Once the data is merged in one file ,I need to remove duplicates on nth column to find out distinct... (2 Replies)
Discussion started by: STCET22
2 Replies

2. Shell Programming and Scripting

Removing multiple lines from input file, if multiple lines match a pattern.

GM, I have an issue at work, which requires a simple solution. But, after multiple attempts, I have not been able to hit on the code needed. I am assuming that sed, awk or even perl could do what I need. I have an application that adds extra blank page feeds, for multiple reports, when... (7 Replies)
Discussion started by: jxfish2
7 Replies

3. UNIX for Dummies Questions & Answers

Appending multiple files

I am trying to append multiple files in a directory cat /a/file1.txt /a/file2.txt /a/file3.txt /a/file4.txt > /a/file.txt Except file2 every other file is appending. I interchanged file names and ran the command. Whatever file repeating in the second position is missing in output... (6 Replies)
Discussion started by: eskay
6 Replies

4. Shell Programming and Scripting

Appending lines in a file

Hello, I have a file like: str1,"HEX"H,(39),info str2,"HEX"H,(854548),info str3,"HEX"H,'BGTOUR',info str4,"HEX"H,(534322),info str1,"HEX"H,,info str3,"HEX"H,'Landing',info str4,"HEX"H,'BG',info str1,"HEX"H,,info str3,"HEX"H,'Ay',info str1,"HEX"H,(27),info str2,"HEX"H,(854548),info... (2 Replies)
Discussion started by: apenkov
2 Replies

5. UNIX for Dummies Questions & Answers

Grouping or appending the lines in a file through Unix

Hi, I am looking for a way to Group the Lines in a file.. Basically My file structure is something like this A 1 100 abc def A 1 200 abc def A 1 300 abc def A 2 100 pqr def A 2 200 pqr def A 2 300 pqr def A 1 100 abc def A 1 200 xyz def A 1 300 xyz def I need it as... (6 Replies)
Discussion started by: mkandula1983
6 Replies

6. Shell Programming and Scripting

appending lines to a file dynamically

Hi all, I have a file with some number of lines. I need to add certain number of lines from another file which may vary according to the user's input and to it. eg code: I/P file 1 apps/file/xyz apps/file/abc apps/file/def file 2 progs/file/xyz ... (2 Replies)
Discussion started by: Ananthdoss
2 Replies

7. Shell Programming and Scripting

sed appending needed only after first instance

Hi, Here is my piece of code used with sed in shell script: sed -i '/<falsemodule-option>/ a\<LdapLogin>' myxmlfile The problem that i am facing with the above is that in 'myxml' file i have mulitple instances of <falsemodule-option> so when i execute the above sed command, it is appending... (10 Replies)
Discussion started by: sunrexstar
10 Replies

8. Shell Programming and Scripting

need help appending lines/combining lines within a file...

Is there a way to combine two lines onto a single line...append the following line onto the previous line? I have the following file that contains some blank lines and some lines I would like to append to the previous line... current file: checking dsk c19t2d6 checking dsk c19t2d7 ... (2 Replies)
Discussion started by: mr_manny
2 Replies

9. Shell Programming and Scripting

Appending line/lines with sed

Hi folks, I need to append line or bulk of lines into a file. For example,I have the following section in opmn.xml file: <process-type id="OC4J_RTEadmin_NIR" module-id="OC4J"> <module-data> <category id="start-parameters"> <data... (28 Replies)
Discussion started by: nir_s
28 Replies

10. Shell Programming and Scripting

Appending Consecutive lines

Hi, I have a file containing a single field on every row. What I need is to append one on to the end of another, e.g. The input file looks like this: nnnnn mmmmmm nnnnn mmmmmm I need it to look like this: nnnnn mmmmmm nnnnn mmmmmm Any ideas would be much appreciated,... (8 Replies)
Discussion started by: pondlife
8 Replies
Login or Register to Ask a Question