Editing last line of a file

Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Editing last line of a file
# 1  
Old 02-28-2008
Editing last line of a file

Hi All,

Could you please help me out with this problem?

I need to edit the last line of my file.
Ex: The last line in my file will be say 000056000045 8

I need to subtract some number from the number 45 and replace the new number in its place.

Thank you all in advance.
# 2  
Old 02-28-2008
For example, substitute 45 with 99:

sed -i "\$s/\(.*\)..\( .\)$/\199\2/" input_file

Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Editing in vi - adding words to a line

i have lines in a file similar to this: results=$(echo Total: ${res} | command | command) now I need to add text before the word "results", but i dont know how to do it. here's what i tried: %s~results=.*echo Total:.* ${7}~PROCESS \; results=.*echo Total:.* ${7}~g the problem is,... (1 Reply)
Discussion started by: SkySmart
1 Replies

2. Shell Programming and Scripting

Editing the next line of the pattern

Hi All, I am trying to edit the next line when there is a success for a pattern. For example: <nvname>abc</nvname> <nvvalue>1</nvvalue> <nvname>def</nvname> <nvvalue>2</nvvalue> once there is a hit for the string "abc" the value of the nvvalue should be replaced with the value we... (5 Replies)
Discussion started by: pulgupta
5 Replies

3. Shell Programming and Scripting

editing single line in html file in perl script

Hi Folks, It is regarding the perl scripting. I have an html file(many files) which contains the below line in the body tag. <body> <P><STRONG><FONT face="comic sans ms,cursive,sans-serif"><EM>Hello</EM></FONT></STRONG></P> </body> Now I want to read that html file through perl... (3 Replies)
Discussion started by: giridhar276
3 Replies

4. Shell Programming and Scripting

editing line in text file adding number to value in file

I have a text file that has data like: Data "12345#22" Fred ID 12345 Age 45 Wilma Dino Data "123#22" Tarzan ID 123 Age 33 Jane I need to figure out a way of adding 1,000,000 to the specific lines (always same format) in the file, so it becomes: Data "1012345#22" Fred ID... (16 Replies)
Discussion started by: say170
16 Replies

5. Shell Programming and Scripting

Editing the first line of file

I have a sample file as below :- RECORD_COUNT|2660|28606946.86|20110701122349694| adkad|wwsgesg|mkmk|FFFF|FAFAF|FFAF|FAFFFFA|5894858| I have to replace the second coulmn in the first row which is the count of no of lines in the file from a new variable . Also I have to delete the 3rd... (2 Replies)
Discussion started by: Sanjeev Yadav
2 Replies

6. UNIX for Dummies Questions & Answers

Help with editing 2nd line after match

Hi All I would like to break down each next line that matches SK1.chr* in this case NNNNNN.... into 100 characters each after SK1.chr*... (3 Replies)
Discussion started by: pawannoel
3 Replies

7. UNIX for Dummies Questions & Answers

Line editing

I have some trouble editing a line. My aim is to edit the first line of a file.It will look the code and if there are dummy characters at the begininng of line before < it will erase. It is a php code.For instance: for instance if the first line is like %^<?php>sadsa</php>, it will change it to... (6 Replies)
Discussion started by: king87
6 Replies

8. Shell Programming and Scripting

awk line editing

Hello I am trying to make an awk script that always replaces the same characters in a file, with white space in between. Can anyone write a script that prompts for the 3 numbers and then replaces them in the file? eg. enter a b c: 'it then puts a b c in the file. The file format is always ... (12 Replies)
Discussion started by: gav2251
12 Replies

9. Shell Programming and Scripting

Single line file editing command?

Hello everyone. I have been reading a lot about the various different text editors at my disposal through Unix, but I just can't seem to close the deal for what I am trying to do. Is there a way to issue a single line command to edit a file where pattern=x, and do it non-destructively AND in-place?... (1 Reply)
Discussion started by: gator76
1 Replies

10. Shell Programming and Scripting

SED - editing file names (End of line problem?)

For lists in sed, to say what to replace, is this correct: I am hoping that this would recognise that either a "." is present, or that the substitution happens at the end of the line. For files with extensions , my script works perfectly. My problem is, files without extentions, i.e. . ... (1 Reply)
Discussion started by: busillis
1 Replies
Login or Register to Ask a Question