find and replace in the same file

[whygh]

Hi guys,

I am learning how to use regular expression. Can I directly find a matching string and replace it in the same file?I mean input and outout is the same file.

For example:
test.txt :
Hello
All
Sed
Awk
wall
google

after I use "s/(.){2,}\1.*//g",test.txt turn into
heo
A
sed
Awk
wa
gle

 

[icrf]

not really, the common ways to do that are to read the file into memory and then overwrite it as you loop through, or to write to a second file as you read the first, and then just delete/rename when you're done.

Alternatively, have you looked at the -i switch to the perl interpreter itself in perlrun?

________________________________________
Andrew

I work for a gift card company!