Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: String Replacement Script
Top Forums Shell Programming and Scripting String Replacement Script Post 302071936 by jbud on Tuesday 25th of April 2006 08:56:54 PM
Old 04-25-2006
String Replacement Script
Okay, I have a script right now that is made to search through a file and replace certain strings with a new one. The format to execute is "/subst <replacethis> <withthis> <filename>" and it only updates the file IF changes are made (in order to preserve the time it was made/last modified). I have this working 100% right now, but the next step is to edit the script so that it is possible for users to do "/subst <replacethis> <withthis> <filename> <filename2> <filename3> <filenamex>" as high as they want. If anyone can point me in the right direction of methods to do this or simply fix it for me, I would be very greatful.

Here is my current script:
Code:
#!/bin/bash

replacethis=$1
withthis=$2
file=$3

sed -e "s+$replacethis+$withthis+g" $file > $file.bak

cmp $file $file.bak > /dev/null
if [ $? -eq 0 ]
then
  echo "Files are the same, nothing was replaced."
  rm $file.bak
else  
  mv $file.bak $file
fi

Thanks in advance for anyone that can help!
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

sed problem - replacement string should be same length as matching string.

Hi guys, I hope you can help me with my problem. I have a text file that contains lines like this: 78 ANGELO -809.05 79 ANGELO2 -5,000.06 I need to find all occurences of amounts that are negative and replace them with x's 78 ANGELO xxxxxxx 79... (4 Replies)
Discussion started by: amangeles
4 Replies

2. Shell Programming and Scripting

Need shell/sed script for grep+string replacement

Hi, Let me explain the situation. There are many files in a directory and its sub-directories that conatin the string pattern "pa". I want to replace all such instances with the pattern "pranavagarwal" doing a grep "pa" `ls` does give me all the instances of the occurence of that... (3 Replies)
Discussion started by: pranavagarwal
3 Replies

3. Shell Programming and Scripting

Replacement of string

Hi I have a text file which contains the following. AAA,BBB,CCC,DDD AAA,BBB,CCC,DDD AAA,BBB,CCC,DDD How can I replace all CCC with 888, with other contents inside the file remain unchange? Please advice Desired output: AAA,BBB,888,DDD AAA,BBB,888,DDD AAA,BBB,888,DDD (1 Reply)
Discussion started by: c0384
1 Replies

4. Shell Programming and Scripting

String replacement

Hi I am new to shell scripting but i manage to do some simple things. I am trying to replace a string in one file. I am using sed to replace but it is not permanently writing to the file, rather it is temporary. I want to know whether is there any another method to replace a string in a file... (7 Replies)
Discussion started by: reddybs
7 Replies

5. Shell Programming and Scripting

String replacement

I have one string string1=user/password:IP_ADDR:Directory I need to replace string1 value like store into string2 string2=user password:IP_ADDR:Directory i.e replace "/" character by '<space>' character But i wouldn't use any file in the meantime. Please help me......................... (6 Replies)
Discussion started by: mnmonu
6 Replies

6. Shell Programming and Scripting

Issues with string replacement

I posted this issue a week or so ago and I still cant get the script to work. Here is what I have so far and what Im trying to do. #!/bin/ksh old="$1" new="$2" file=$3 grep $1 $3 > /dev/null if ;then cp $3 ${3}.bak sed "s/$1/$2/g" $3 > ${3}~ mv ${3}~ ${3} fithe script is... (5 Replies)
Discussion started by: gordonheimer
5 Replies

7. Shell Programming and Scripting

String replacement

Hi All, I have below file which has data in below format. #$ | AB_100 | AB_300 ()| AB_4 @*(% | AB-789 i want o/p as below format. | AB_100 | AB_300 | AB_4 | AB-789 So here there is no standard format. How we can achieve the same in unix ? Regards, (3 Replies)
Discussion started by: gander_ss
3 Replies

8. Shell Programming and Scripting

String replacement.

Dear Friends, I want to replace following line with given line. It should grep/search following string in a file (input.txt) M/M SRNO: 000M/6200-0362498 COSMETIC PRO MALE FEMALE Once found it should replace it to following string. T_DLHNNO: 000M/6200-0362498 ... (7 Replies)
Discussion started by: anushree.a
7 Replies

9. Shell Programming and Scripting

String replacement

Hi, I have a text file where all records come in one line (single line file), each record starts with 'BUCH' and ends with '@&' and if data is not there we get space instead. between '@&' and next record there might be some spaces, now I want to remove those spaces between '@&' and 'BUCH'. ... (4 Replies)
Discussion started by: maks475
4 Replies

10. Shell Programming and Scripting

Parallel replacement string

Hi, Using the following command, I can only get rid of the last extension from my input file name: parallel command '>' {.}.output ::: my.input.file The output file is "my.input.output" How can I get rid of the last two extensions of my input file name, so that end up with "my.output"?... (4 Replies)
Discussion started by: forU
4 Replies

LEARN ABOUT LINUX

prename

RENAME(1)						 Perl Programmers Reference Guide						 RENAME(1)

NAME

       rename - renames multiple files

SYNOPSIS

       rename [ -v ] [ -n ] [ -f ] perlexpr [ files ]

DESCRIPTION

       "rename" renames the filenames supplied according to the rule specified as the first argument.  The perlexpr argument is a Perl expression
       which is expected to modify the $_ string in Perl for at least some of the filenames specified.	If a given filename is not modified by the
       expression, it will not be renamed.  If no filenames are given on the command line, filenames will be read via standard input.

       For example, to rename all files matching "*.bak" to strip the extension, you might say

	       rename 's/.bak$//' *.bak

       To translate uppercase names to lower, you'd use

	       rename 'y/A-Z/a-z/' *

OPTIONS

       -v, --verbose
	       Verbose: print names of files successfully renamed.

       -n, --no-act
	       No Action: show what files would have been renamed.

       -f, --force
	       Force: overwrite existing files.

ENVIRONMENT

       No environment variables are used.

AUTHOR

       Larry Wall

SEE ALSO

       mv(1), perl(1)

DIAGNOSTICS

       If you give an invalid Perl expression you'll get a syntax error.

BUGS

       The original "rename" did not check for the existence of target filenames, so had to be used with care.	I hope I've fixed that (Robin
       Barker).

perl v5.12.4							    2011-08-10								 RENAME(1)
All times are GMT -4. The time now is 04:54 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy