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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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SCRIPT(1)							   User Commands							 SCRIPT(1)

NAME
script - make typescript of terminal session SYNOPSIS
script [options] [file] DESCRIPTION
script makes a typescript of everything displayed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves the dialogue in this file. If no filename is given, the dialogue is saved in the file type- script. OPTIONS
-a, --append Append the output to file or to typescript, retaining the prior contents. -c, --command command Run the command rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves differently when its stdout is not a tty. -e, --return Return the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n. -f, --flush Flush output after each write. This is nice for telecooperation: one person does `mkfifo foo; script -f foo', and another can supervise real-time what is being done using `cat foo'. --force Allow the default output destination, i.e. the typescript file, to be a hard or symbolic link. The command will follow a symbolic link. -q, --quiet Be quiet (do not write start and done messages to standard output). -t[file], --timing[=file] Output timing data to standard error, or to file when given. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays. -V, --version Display version information and exit. -h, --help Display help text and exit. NOTES
The script ends when the forked shell exits (a control-D for the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. It is not recommended to run script in non-interactive shells. The inner shell of script is always interactive, and this could lead to unexpected results. If you use script in the shell initialization file, you have to avoid entering an infinite loop. You can use for example the .profile file, which is read by login shells only: if test -t 0 ; then script exit fi You should also avoid use of script in command pipes, as script can read more input than you would expect. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism), scriptreplay(1) HISTORY
The script command appeared in 3.0BSD. BUGS
script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. script is primarily designed for interactive terminal sessions. When stdin is not a terminal (for example: echo foo | script), then the session can hang, because the interactive shell within the script session misses EOF and script has no clue when to close the session. See the NOTES section for more information. AVAILABILITY
The script command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils /util-linux/>. util-linux June 2014 SCRIPT(1)
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