BASH: Interactive "cp" (and "mv") in a loop Post: 302504070

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Top Forums UNIX for Dummies Questions & Answers BASH: Interactive "cp" (and "mv") in a loop Post 302504070 by SilversleevesX on Sunday 13th of March 2011 01:00:40 PM

03-13-2011

Registered User

BASH: Interactive "cp" (and "mv") in a loop

Hi.

I have a copy-file script (and a move-file script) that I recently tried to make interactive. I tested the former on three files from a text list, and watched to see what would happen. As the cp command was in a while/do/done loop, there was no pause for input: it wrote the file from the list to the destination directory. Casually-speaking, it "barreled right through" the list as if the -i wasn't there.

Here's part of the copy-file script.

Code:

#!/bin/bash

while read 'line';
do
n=$(echo $line)
file=${n%,*}
dest=${n#*,}
if [[ "$dest" == "" ]]; then continue; fi
echo -e "Copying $file now."
cp -ipPv $file $dest

done<copylist.txt

I know the 'pPv' options are more or less unnecessary, particularly the capital 'P', but as I write and use many of my scripts both in Cygwin and GNOME, it seems more prudent to me to include them.

In a loop such as this, would I be better off preventing overwrite (and changes of mod date, file-length, etc to the file that ended up at the destination) to write in an if/then/fi that checked for the file in the destination before copying? Something like this?

Code:

if [ -e "$dest/$file" ]; then
echo -e "Do you want to overwrite $file? (y/n)"
read arPLy
if [[ "$arPLy" != "n" ]]; then
cp -pPv $file $dest
else
continue
fi
fi

Or is there a way to introduce (I hesitate to say "force") a pause in that loop at the "cp -i" stage?

Hope someone can help and soon.

BZT

SilversleevesX

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irunner3

IRUNNER(1)																IRUNNER(1)

NAME

       irunner - interactive runner interface

SYNOPSIS

       irunner [options] file_to_run

DESCRIPTION

       irunner	is  an	interface to the various interactive runners available in IPython's irunner module.  It can used to run scripts as if they
       where typed up interactively.

       The already implemented runners are listed below; adding one for a new program is a trivial task, see the source for examples.

OPTIONS

       -h, --help
	      show this help message and exit

       --ipython
	      IPython interactive runner (default).

       --python
	      Python interactive runner.

       --sage SAGE interactive runner.

EXAMPLE

       irunner.py --python -- --help will pass --help to the python runner.  Similarly, irunner.py --ipython -- --interact script.ipy

SEE ALSO

       ipython(1)

AUTHOR

       irunner	 is   an   extension   of   Ken   Schutte   <kschutte-AT-csail.mit.edu>'s   script   contributed   on	the   ipython-user   list:
       http://mail.scipy.org/pipermail/ipython-user/2006-May/003539.html

       This  manual  page  was written by Bernd Zeimetz <bernd@bzed.de>, for the Debian project (but may be used by others).  Modified by Fernando
       Perez <Fernando.Perez@berkeley.edu> for inclusion in IPython.

								   July 15, 2011							IRUNNER(1)