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From: Marc Girod on 21 Feb 2010 06:02
On Feb 20, 11:52 pm, Ben Morrow <b...(a)morrow.me.uk> wrote:

> You want the /e switch.

I can see that I obviously missed the question,
focusing as I did on making sure that the single
string in the file I changed would be the one
matching the file name, and not even noticing
the issue of incrementing the number.

So, thanks for the /e switch which I didn't know.
Thanks also for the explanation about the .bak
files on cygwin.

Now, if the files also happen to contain the
names of other files in the list, these other
lines would be modified as well.
We were not told what else the files contain...
In fact, I assumed that the first (or an early)
line would contain the file name, but that there
could be lots of data below, which is why I
attempted to close the file after the
replacement, which with -pi, wasn't a good idea.

a> cat Fife_Ch3.html
Fife_Ch0.html
Fife_Ch1.html
Fife_Ch2.html
Fife_Ch3.html
a> perl -pi -e 's/^Fife_Ch(\d+)\.html$/$1 + 1/e if /^${ARGV}$/'
Fife_Ch*.html
a> rm *.bak
a> ls -l
total 12
-rw-r--r--+ 1 marc None 44 2010-02-21 10:40 Fife_Ch0.html
-rw-r--r--+ 1 marc None 44 2010-02-21 10:40 Fife_Ch1.html
-rw-r--r--+ 1 marc None 44 2010-02-21 10:40 Fife_Ch2.html
-rw-r--r--+ 1 marc None 44 2010-02-21 10:40 Fife_Ch3.html
a> cat Fife_Ch3.html
Fife_Ch0.html
Fife_Ch1.html
Fife_Ch2.html
4

Marc
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