Sponsored Content
Top Forums Shell Programming and Scripting Script to change file contents line by line Post 302282848 by angheloko on Monday 2nd of February 2009 03:39:00 AM
Old 02-02-2009
Hope this helps:

Code:
sed '
h
s/^.\{8\}\(.\).*/\1/
y/abcdefghijklmnopqrstuvwxyz/11111111111111111111111111/
G
s/\(.*\)\n\(.\{8\}\).\(.*$\)/\2\1\3/
h
s/^.\{13\}\(.\).*/\1/
y/abcdefghijklmnopqrstuvwxyz/44444444444444444444444444/
G
s/\(.*\)\n\(.\{13\}\).\(.*$\)/\2\1\3/' foo

Sample:
Code:
$ sed '
> h
> s/^.\{8\}\(.\).*/\1/
> y/abcdefghijklmnopqrstuvwxyz/11111111111111111111111111/
> G
> s/\(.*\)\n\(.\{8\}\).\(.*$\)/\2\1\3/
> h
> s/^.\{13\}\(.\).*/\1/
> y/abcdefghijklmnopqrstuvwxyz/44444444444444444444444444/
> G
> s/\(.*\)\n\(.\{13\}\).\(.*$\)/\2\1\3/' foo
line1 aa1a xx4x
line2 bb1b yy4y
line3 cc1c zz4z

Also, you can save this to a file:
Code:
h
s/^.\{8\}\(.\).*/\1/
y/abcdefghijklmnopqrstuvwxyz/11111111111111111111111111/
G
s/\(.*\)\n\(.\{8\}\).\(.*$\)/\2\1\3/
h
s/^.\{13\}\(.\).*/\1/
y/abcdefghijklmnopqrstuvwxyz/44444444444444444444444444/
G
s/\(.*\)\n\(.\{13\}\).\(.*$\)/\2\1\3/

And the run it by:

Code:
sed -f foo.sed foo

 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

how to echo the file contents LINE BY LINE

hello, i have a listing (let say ABC) consists of the below: : public database link public synonym role rollback segment : when i run the below for loop, for i in `more ABC` do echo "$i" done it gives me, : public database (4 Replies)
Discussion started by: newbie168
4 Replies

2. Shell Programming and Scripting

Search a pattern in a file with contents in a single line

Hi all I am searching for a pattern in a file . The file content is in a single line.If am doing a grep or sed for the a particular pattern am getting whole file. I want the result in different lines. attaching the file for reference search pattern "/xxxxxx/hhhh/tttttttt/sss/" and... (4 Replies)
Discussion started by: sparks
4 Replies

3. Shell Programming and Scripting

shell script to read a line in gps receiver log file and append that line to new file

Hi, I have gps receiver log..its giving readings .like below Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. GPSD,R=1 $GPGSV,3,1,11,08,16,328,40,11,36,127,00,28,33,283,39,20,11,165,00*71... (3 Replies)
Discussion started by: gudivada213
3 Replies

4. Shell Programming and Scripting

Change a line in a php file thanks to a shell script

Hi, I'm working on a script to make automatic the new releases of my website... However in this script I put all the css script in a single one. There's no rpoblem for that. My problem is when I want to change the header of my layout page to put instead of : $header.="<link rel=\"stylesheet\"... (2 Replies)
Discussion started by: lahabana
2 Replies

5. UNIX for Dummies Questions & Answers

How to read contents of a file from a given line number upto line number again specified by user

Hello Everyone. I am trying to display contains of a file from a specific line to a specific line(let say, from line number 3 to line number 5). For this I got the shell script as shown below: if ; then if ; then tail +$1 $3 | head -n $2 else ... (5 Replies)
Discussion started by: grc
5 Replies

6. Shell Programming and Scripting

change file contents using script

Hi, Requirement:- Need to change pfile,so while executing script,it has to go to pfile location(ORACLE_HOME/dbs) and open init<SID>.ora file and change value db_name=<>. If db_name=abcd,script will change the db_name=1234 likr that.. Please help to code this (1 Reply)
Discussion started by: Sanal
1 Replies

7. Shell Programming and Scripting

Shell script to read a text file line by line & process it...

Hi , I am trying to write an shell, which reads a text file (from a location) having a list of numbers of strictly 5 digits only ex: 33144 Now my script will check : 1) that each entry is only 5 digits & numeric only, no alphabets, & its not empty. 2)then it executes a shell script called... (8 Replies)
Discussion started by: new_to_shell
8 Replies

8. Shell Programming and Scripting

how to read the contents of two files line by line and compare the line by line?

Hi All, I'm trying to figure out which are the trusted-ips and which are not using a script file.. I have a file named 'ip-list.txt' which contains some ip addresses and another file named 'trusted-ip-list.txt' which also contains some ip addresses. I want to read a line from... (4 Replies)
Discussion started by: mjavalkar
4 Replies

9. Shell Programming and Scripting

Need script to change a line in file....

Hello all, I have a line of code in a file that I need to change in the /etc/sysconfig/kdump file presently the line reads: KDUMP_COMMANDLINE_APPEND="irqpoll nr_cpus=1 reset_devices cgroup_disable=memory mce=off" what I need to do is put a comment out the 1st line and repeat it, and... (5 Replies)
Discussion started by: gartie
5 Replies

10. Shell Programming and Scripting

Bash script to read a file from particular line till required line and process

Hi All, Am trying to write wrapper shell/bash script on a utility tool for which i need to pass 2 files as arugment to execute utility tool. Wraper script am trying is to do with above metion 2 files. utility tool accepts : a. userinfo file : which contains username b. item file : which... (2 Replies)
Discussion started by: Optimus81
2 Replies
fold(1) 							   User Commands							   fold(1)

NAME
fold - filter for folding lines SYNOPSIS
fold [-bs] [-w width | -width] [file...] DESCRIPTION
The fold utility is a filter that will fold lines from its input files, breaking the lines to have a maximum of width column positions (or bytes, if the -b option is specified). Lines will be broken by the insertion of a NEWLINE character such that each output line (referred to later in this section as a segment) is the maximum width possible that does not exceed the specified number of column positions (or bytes). A line will not be broken in the middle of a character. The behavior is undefined if width is less than the number of columns any single character in the input would occupy. If the CARRIAGE-RETURN, BACKSPACE, or TAB characters are encountered in the input, and the -b option is not specified, they will be treated specially: BACKSPACE The current count of line width will be decremented by one, although the count never will become negative. fold will not insert a NEWLINE character immediately before or after any BACKSPACE character. CARRIAGE-RETURN The current count of line width will be set to 0. fold will not insert a NEWLINE character immediately before or after any CARRIAGE-RETURN character. TAB Each TAB character encountered will advance the column position pointer to the next tab stop. Tab stops will be at each column position n such that n modulo 8 equals 1. OPTIONS
The following options are supported: -b Counts width in bytes rather than column positions. -s If a segment of a line contains a blank character within the first width column positions (or bytes), breaks the line after the last such blank character meeting the width constraints. If there is no blank character meeting the requirements, the -s option will have no effect for that output segment of the input line. -w width|-width Specifies the maximum line length, in column positions (or bytes if -b is specified). If width is not a positive decimal number, an error is returned. The default value is 80. OPERANDS
The following operand is supported: file A path name of a text file to be folded. If no file operands are specified, the standard input will be used. EXAMPLES
Example 1: Submitting a file of possibly long lines to the line printer An example invocation that submits a file of possibly long lines to the line printer (under the assumption that the user knows the line width of the printer to be assigned by lp(1)): example% fold -w 132 bigfile | lp ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of fold: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. EXIT STATUS
The following exit values are returned: 0 All input files were processed successfully. >0 An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |enabled | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
cut(1), pr(1), attributes(5), environ(5), standards(5) NOTES
fold and cut(1) can be used to create text files out of files with arbitrary line lengths. fold should be used when the contents of long lines need to be kept contiguous. cut should be used when the number of lines (or records) needs to remain constant. fold is frequently used to send text files to line printers that truncate, rather than fold, lines wider than the printer is able to print (usually 80 or 132 column positions). fold may not work correctly if underlining is present. SunOS 5.10 1 Feb 1995 fold(1)
All times are GMT -4. The time now is 08:51 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy