automating find and replace on bash scrips?y

[Alex Maynard]

On Sun, 4 Nov 2007, Chris F.A. Johnson wrote:

> On Sun, 4 Nov 2007, Alex Maynard wrote:
>> 
>> I am getting a bit stuck on an (admittedly very simple) bash script to 
>> automate find/replace in bash.
>> 
>> What I'm aiming for is:
>> 
>> File $1: text file on which I want to run multiple find/replaces
>> 
>> File $2: text file with list of what to replace by what
>> 
>> To make it concrete, say I wanted to replace capital by lower case letters. 
>> Then I might have File $2 look like:
>> A a
>> B b
>> C c
>> etc.
>> 
>> The part I know how to do is:
>> 
>> sed 's/B/b/' <$1>tmp_sed
>> cp tmp_sed $1
>> 
>> Adding a loop around this shouldn't be a problem either.
>> 
>> The part I'm stuck on is: On say, the second iteration of the loop,
>> how do I get bash or sed to obtain "B" and "b" automatically from
>> the second line of file $2.
>> 
>> If anyone has any tips or pointers, I'd be grateful.
>
>   The easiest way is to turn the file with the search/replace strings
>   into a sed script:
>
> s/A/a/  ## add the g command?  s/A/a/g
> s/B/b/
> s/C/c/
>
>   You can automate the conversion of the file to a script:
>
> awk '{ printf "s/%s/%s/\n", $1, $2 }'
>
>   More will have to be done if any of your strings contain a slash.

Thank you very much! In what I want to finally use this for (latex 
commands in long and short-cut form) they will all start with 
slashes "\", . I will start by seeing if I can get your good suggestions
working on this simpler alphabet example without the slashes.

Alex


>
>
>   Then you can run:
>
> sed -f "$2" "$1" > tmp_sed && cp tmp_sed "$1"
>
>
> --
>   Chris F.A. Johnson, webmaster         <http://woodbine-gerrard.com>
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