Modifying text files with unix script

[ezeke1]

I have a handful of source files written in C code and I would like to change the header information in all of them. So basically I want to either add or remove the text in the file and replace it with something I want. What is the best approach to accomplish this? Here's an example:

"test.c" file:

////////////////
// old header //
// //
////////////////


Thanks all!!!
-David
////////////////
// new header //
// //
////////////////

 

[PHV]

man sed

Hope This Helps, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ222-2244

 

[johngiggs]

ezeke1,

For your example, try something like this:

sed 's!// old header //!// new header //!g' test.c > $$.tmp && mv $$.tmp test.c

Hope this helps.

John

 

[ezeke1]

Thanks John and PH, let me give sed a try.

-David

 

[micotao]

Hi, All:
Although we can do pattern match and corresponding substitution in Awk and Sed, I find it very disable when we want to do value-substitution.I mean:say, when I want to replace the words which equal to the value of $var1(say,$var1="charlie", we want to replace where it is charlie to daniel,here $var2=daniel) in file "file_test1",and we can't know what string to replace because var1,var2 is dynamically assigned value.How to do such "value-substitution"??? e.g.:
sed 's/$var1/$var2/g' file_test1
this will fully disobey what we want it to do!!!it will do pure pattern substitution,$var1--->$var2, but we want it to replace all "charlie" ---->"daniel".
PLEASE TELL ME HOW TO SOLVE SUCH A PROBLEM???We have to do such work in our work, THIS IS IN VERY URGENT NEED!!!!
help,please.

 

[dchoulette]

If neither $var1 nor $var2 contains '/' characters:

sed 's/[highlight]'"[/highlight]$var1[highlight]"'[/highlight]/[highlight]'"[/highlight]$var2[highlight]"'[/highlight]/g' file_test1

--------------------

Denis