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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
Old 03-13-2011
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
 

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COPY(3) 								 1								   COPY(3)

copy - Copies file

SYNOPSIS
bool copy (string $source, string $dest, [resource $context]) DESCRIPTION
Makes a copy of the file $source to $dest. If you wish to move a file, use the rename(3) function. PARAMETERS
o $source - Path to the source file. o $dest - The destination path. If $dest is a URL, the copy operation may fail if the wrapper does not support overwriting of existing files. Warning If the destination file already exists, it will be overwritten. o $context - A valid context resource created with stream_context_create(3). RETURN VALUES
Returns TRUE on success or FALSE on failure. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.4 | | | | | | | Changed the $context parameter to actually have | | | an effect. Previously, any $context was ignored. | | | | | 5.3.0 | | | | | | | Added context support. | | | | | 4.3.0 | | | | | | | Both $source and $dest may now be URLs if the | | | "fopen wrappers" have been enabled. See fopen(3) | | | for more details. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 copy(3) example <?php $file = 'example.txt'; $newfile = 'example.txt.bak'; if (!copy($file, $newfile)) { echo "failed to copy $file... "; } ?> SEE ALSO
move_uploaded_file(3), rename(3), The section of the manual about handling file uploads. PHP Documentation Group COPY(3)
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