On Sun, 2003-11-02 at 02:22, Nabin Limbu wrote:
> Hi,
>
> In my script, I need to read a file name and change its first
> character of file name with another predefined character. How can I
> do that with shell scripting.
>
> for example:
>
> if A = "glow"
>
> then, B should be "blow" ("g" replaced by "b")
> ( glow -> blow )
>
While this is possible, depending on the data, using bash parameter
expansion, I think it would get kind of hairy to bullet proof it.
[bhughes@bretsony bhughes]$ echo $myfile
blow
[bhughes@bretsony bhughes]$ newfile=${myfile/b/g}
[bhughes@bretsony bhughes]$ echo $newfile
glow
this does weird things when trying to work with unknown input data:
for instance:
[bhughes@bretsony bhughes]$ myfile=ablob
[bhughes@bretsony bhughes]$ newfile=${myfile/b/g}
[bhughes@bretsony bhughes]$ echo $newfile
aglob
man bash
search for Parameter Expansion
you could then do something like
[bhughes@bretsony bhughes]$ for myfile in b*; do echo mv $myfile ${myfile/b/g};done
mv backup gackup
mv bigemail.txt gigemail.txt
mv bin gin
mv browser.xul growser.xul
[bhughes@bretsony bhughes]$
remove the echo in the do loop and the mv stament would be run
This does not check for file type or perms but should of course.
I would use perl or awk or sed or anything that understands regexps for
this so you can test the first char only easily.
HTH
Bret
--
redhat-list mailing list
unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe
https://www.redhat.com/mailman/listinfo/redhat-list
