[GLLUG] Need help creating a shell Script

Bruce Smith blubdog at gmail.com
Sun Apr 9 17:39:52 EDT 2006 

I'm not sure which distros set the the "-i" aliases by default, but
I'm sure I've seen it before (I specially remember a certain
individual bitching about that because he didn't like the "-i" and
thought it was un-unix-like to have it set).  It may have been a long
time ago, since I've been using Linux since 1994.  I'm not sure if any
distros still set "-i" aliases by default, I just do it myself to be
sure in either case.

I am sure that "cp -i" and "mv -i" only prompt if the outfile is to be
overwritten.  Without the "-i", it will overwrite silently (unless you
don't have permission to overwrite).  I thought it'd be safer for the
script to have that feature and not overwrite any files without
asking.

 - BS


> guess I thought it worked like rm -i where it prompts every time. but as far
> as I know gentoo doesn't set that alias. Infact I'm not sure I've seen them
> set any. I you want them, you set them yourself. but anyways my confusion.
>
>
> On 4/8/06, Bruce Smith <blubdog at gmail.com> wrote:
> > "mv -i" only prompts to overwrite when the destination filename
> > exists.  Without the "-i", mv will silently nuke the existing dest.
> > file.
> >
> > Most distros have an alias in the default login script of "mv" to "mv
> > -i" (and "cp" to "cp -i") which is why you may be seeing that
> > behaviour in the shell now.  However aliases don't carry over to shell
> > scripts, so you need to be careful.
> >
> > - BS
> >
> >
> > On 4/8/06, Caleb Cushing <xenoterracide at gmail.com> wrote:
> > > I actually do have another question about this script. why doesn't mv -i
> > > prompt me before changing the files when it's run like this?
> > >
> > >
> > > On 4/7/06, Alec Warner <warnera6 at egr.msu.edu> wrote:
> > > > Caleb Cushing wrote:
> > > > > haven't tried it yet backing up the directory into a tarball that'll
> > > take a
> > > > > while. Do you think you could comment it for me? basically
> programming
> > > of
> > > > > any kind is a weak point for me. I'm trying to improve. but copying
> and
> > > > > pasting someone elses code may fix my issue but it won't fix my
> > > > > understanding. "give a man a fish... teach a man to fish..." sort of
> > > thing.
> > > > >
> > > > >>
> > > > >>
> > > > >>On 4/6/06, Bruce Smith < blubdog at gmail.com> wrote:
> > > > >>
> > > > >>>Disclaimer, backup the directory first!  :-)
> > > > >>>And copy/paste exactly!
> > > > >>>
> > > > >>>You can test without changing anything by adding an "echo" in front
> of
> > > > >>>the "mv" and optionally commenting out the "set" statements for
> better
> > > > >>>readability.
> > > > >>>
> > > > >>>One bug (feature?) is it will replace multiple spaces with only ONE
> > > > >>>underscore.
> > > > >>>
> > > > >>>You need to run it with the filename(s) as arguments.  i.e.:
> > > > >>>  /path/to/scriptname *
> > > > >>>  /path/to/scriptname a*
> > > > >>>  /path/to/scriptname 'File to Test this  Thing on.TXT'
> > > > >>>
> > > > >>>- BS
> > > > >>>
> > > > >>>
> > > > >>>#!/bin/sh            # Run using /bin/sh, the Bourne Shell
> > > > >>>infile=upper
> > > > >>>outfile=lower
> > > > >>>for f                # Not sure where 'f' comes from, but it's
> looping
> > > throught the standard input, IIRC
> > > > >>>do
> > > > >>>    if [ -f "$f" ]; then # man test will tell you what this does ;)
> > > > >>>        l="$(echo $f|sed 's/ /_/g'|tr "[:${infile}:]"
> > > "[:${outfile}:]")" # echo file, change ' ' to '_', globally, change
> upper to
> > > lower
> > > > >>>
> > > > >>>        if [ "$f" != "$l" ]; then # If the new filename doesn't
> equal
> > > the old filename..
> > > > >>>            set -x                # turn off echo
> > > > >>>            mv -i "$f" "$l"       # rename the file
> > > > >>>            set +x                # turn echo back on
> > > > >>>        fi
> > > > >>>     fi
> > > > >>>done
> > > > >>># end of script
> > > > >>>
> > > > >>>
> > > > >>>On 4/6/06, Caleb Cushing < xenoterracide at gmail.com > wrote:
> > > > >>>
> > > > >>>>I need/want to change the names of all the files and folders in my
> > > > >>>
> > > > >>>/music
> > > > >>>
> > > > >>>>directory to where they don't have spaces in them and all the
> names
> > > > >>>
> > > > >>>are in
> > > > >>>
> > > > >>>>lowercase. This is what I have so far:
> > > > >>>>
> > > > >>>>#!/bin/bash
> > > > >>>>
> > > > >>>>ls -R |                          # List directory recursively
> > > > >>>>sed -e 's/ /_/g' |             # Remove spaces change them to
> > > > >>>
> > > > >>>underscore
> > > > >>>
> > > > >>>>tr [:upper:] [:lower:] |     #change letters from upper to lower
> > > > >>>>
> > > > >>>>that gives me the output of what I would want the directory and
> file
> > > > >>>>structure to look like when I'm done. I am unsure however how to
> take
> > > > >>>
> > > > >>>that
> > > > >>>
> > > > >>>>output and move the files and directories to acually look like
> that
> > > > >>>
> > > > >>>when I
> > > > >>>
> > > > >>>>am finished. It's also the tricky part because if I don't do it
> > > > >>>
> > > > >>>right...
> > > > >>>
> > > > >>>>well it might be an even bigger pain to fix. I pretty sure I have
> a
> > > > >>>
> > > > >>>lot more
> > > > >>>
> > > > >>>>to do to get this workable... and I'm just having problems
> wrapping my
> > > > >>>
> > > > >>>brain
> > > > >>>
> > > > >>>>around it.
> > > > >>>>
> > > > >>>>snippet:before
> > > > >>>>#ls -R
> > > > >>>>
> > > > >>>>./3 Doors Down:
> > > > >>>>Away from the Sun  Seventeen Days  The Better Life   Thumbs.db
> > > > >>>
> > > > >>>desktop.ini
> > > > >>>
> > > > >>>>./3 Doors Down/Away from the Sun:
> > > > >>>>01-When I'm Gone-3 Doors Down-Away from the Sun.mp3
> > > > >>>>02-Away from the Sun-3 Doors Down-Away from the Sun.mp3
> > > > >>>>03-The Road I'm On-3 Doors Down-Away from the Sun.mp3
> > > > >>>>04-Ticket to Heaven-3 Doors Down-Away from the Sun.mp3
> > > > >>>>05-Running Out of Days-3 Doors Down-Away from the Sun.mp3
> > > > >>>>06-Here Without You-3 Doors Down-Away from the Sun.mp3
> > > > >>>>07-I Feel You-3 Doors Down-Away from the Sun.mp3
> > > > >>>>08-Dangerous Game-3 Doors Down-Away from the Sun.mp3
> > > > >>>>09-Changes-3 Doors Down-Away from the Sun.mp3
> > > > >>>>10-Going Down in Flames-3 Doors Down-Away from the Sun.mp3
> > > > >>>>11-Sarah Yellin'-3 Doors Down-Away from the Sun.mp3
> > > > >>>> AlbumArtSmall.jpg
> > > >
> > >
> >>>>AlbumArt_{C212FF41-147D-402C-BAC5-1284F8B4C802}_Large.jpg
> > > >
> > >
> >>>>AlbumArt_{C212FF41-147D-402C-BAC5-1284F8B4C802}_Small.jpg
> > > > >>>>Folder.jpg
> > > > >>>> Thumbs.db
> > > > >>>>desktop.ini
> > > > >>>>
> > > > >>>>snippet:after
> > > > >>>>
> > > > >>>>ls -R
> > > > >>>>
> > > > >>>>./3_doors_down:
> > > > >>>>away_from_the_sun
> > > > >>>>seventeen_days
> > > > >>>>the_better_life
> > > > >>>>thumbs.db
> > > > >>>>desktop.ini
> > > > >>>>
> > > > >>>>./3_doors_down/away_from_the_sun:
> > > >
> >>>>01-when_i'm_gone-3_doors_down-away_from_the_sun.mp3
> > > >
> > >
> >>>>02-away_from_the_sun-3_doors_down-away_from_the_sun.mp3
> > > >
> >>>>03-the_road_i'm_on-3_doors_down-away_from_the_sun.mp3
> > > >
> > >
> >>>>04-ticket_to_heaven-3_doors_down-away_from_the_sun.mp3
> > > >
> > >
> >>>>05-running_out_of_days-3_doors_down-away_from_the_sun.mp3
> > > >
> > >
> >>>>06-here_without_you-3_doors_down-away_from_the_sun.mp3
> > > > >>>>07-i_feel_you-3_doors_down-away_from_the_sun.mp3
> > > >
> >>>>08-dangerous_game-3_doors_down-away_from_the_sun.mp3
> > > > >>>>09-changes-3_doors_down-away_from_the_sun.mp3
> > > >
> > >
> >>>>10-going_down_in_flames-3_doors_down-away_from_the_sun.mp3
> > > >
> >>>>11-sarah_yellin'-3_doors_down-away_from_the_sun.mp3
> > > > >>>>albumartsmall.jpg
> > > >
> > >
> >>>>albumart_{c212ff41-147d-402c-bac5-1284f8b4c802}_large.jpg
> > > >
> > >
> >>>>albumart_{c212ff41-147d-402c-bac5-1284f8b4c802}_small.jpg
> > > > >>>>folder.jpg
> > > > >>>>thumbs.db
> > > > >>>>desktop.ini
> > > > >>>>
> > > > >>>>_______________________________________________
> > > > >>>>linux-user mailing list
> > > > >>>> linux-user at egr.msu.edu
> > > >
> > >
> >>>>http://mailman.egr.msu.edu/mailman/listinfo/linux-user
> > > > >>>>
> > > > >>>>
> > > > >>>>
> > > > >>>
> > > > >>
> > > > >
> > > > >
> > > > >
> > >
> ------------------------------------------------------------------------
> > > > >
> > > > > _______________________________________________
> > > > > linux-user mailing list
> > > > > linux-user at egr.msu.edu
> > > > >
> http://mailman.egr.msu.edu/mailman/listinfo/linux-user
> > > >
> > >
> > >
> > > _______________________________________________
> > > linux-user mailing list
> > > linux-user at egr.msu.edu
> > > http://mailman.egr.msu.edu/mailman/listinfo/linux-user
> > >
> > >
> > >
> >
>
>

More information about the linux-user mailing list