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Full Discussion: shell script to check permission before copy over
Top Forums Shell Programming and Scripting shell script to check permission before copy over Post 302516390 by wanaka on Friday 22nd of April 2011 10:01:58 PM
Old 04-22-2011
shell script to check permission before copy over
Hi,

I am writing some shell script to check the file owner permission whether the write bit is turn on. If it is turn on it will copy the file to the destination else it will just prompt user to change the file and skipping it.

However, I am starting getting loss here as I have couple of issues that I am facing:
1. first the file could be using regular expression in the file for example file* or file?? which is usually handling pretty well if you are using cp command to handle but in script I will have to warn user to put quote.
2. My current script also have limitation that it cannot directory.

Is there any easier way of how the script to structure. For example, let say the user can just like what they did in typical cp command just run
Code:
script -s source -t target

and the script will check through the file owner permission and if it is directory it will check those file permission inside (we do not have to check directory permission).

The more I write my current script the more I find its limitation.

I always thought there should an easier way to just pass the script -s source -t target to cp -pr source target in an easier way.
Code:
#!/bin/bash

#version 1.0
#Revised Date: 10-Feb-2011

#Set this as your target filesystem
TGT="/tmp/dir2"

#Function call to check file owner write bit
#set -x
func_checkperm()
{
        BIT=`ls -l $f | sed -e 's/..\(.\).*/\1/'`
        case $BIT in
                -)
                echo "NO_WRITE"
                ;;
                w)
                echo "WRITE"
                ;;
        esac
}

if [ $# -eq 1 ]
then
        SRC="$1"

        if [ -d "$SRC" ]; then
        echo "This is a directory not a file, please specify a file"

        else

                for f in $SRC
                do
                CON_VALUE=$(func_checkperm "$f")
                case $CON_VALUE in
                        NO_WRITE)
                                echo "$f write permission bit is not set.  Please correct the permisson.  Skipping.."
                        ;;
                        WRITE)
                                cp -pr $f $TGT
                        ;;
                esac
                done
        fi

elif [ $# -gt 1 ]
then
        echo "Please enclose multiple input files or regular expression in quotes.  For example: <script.sh> \"inputsource*\" target"

elif [ "$1" = "" ]
then
        echo "The command usage is not correct"
fi

Last edited by Scott; 04-23-2011 at 02:24 AM.. Reason: Please use code tags
 

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LEARN ABOUT OSX

script

SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME

     script -- make typescript of terminal session

SYNOPSIS

     script [-akq] [-t time] [file [command ...]]

DESCRIPTION

     The script utility makes a typescript of everything printed 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 all dialogue in file.	If no file name is given, the typescript is saved in the file typescript.

     If the argument command is given, script will run the specified command with an optional argument vector instead of an interactive shell.

     The following options are available:

     -a      Append the output to file or typescript, retaining the prior contents.

     -k      Log keys sent to program as well as output.

     -q      Run in quiet mode, omit the start and stop status messages.

     -t time
	     Specify time interval between flushing script output file.  A value of 0 causes script to flush for every character I/O event.  The
	     default interval is 30 seconds.

     The script ends when the forked shell (or command) exits (a control-D to exit 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.  The script utility works best with commands that do not
     manipulate the screen.  The results are meant to emulate a hardcopy terminal, not an addressable one.

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).

HISTORY

     The script command appeared in 3.0BSD.

BUGS

     The script utility places everything in the log file, including linefeeds and backspaces.	This is not what the naive user expects.

     It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues.

     When running in -k mode, echo cancelling is far from ideal.  The slave terminal mode is checked for ECHO mode to check when to avoid manual
     echo logging.  This does not work when in a raw mode where the program being run is doing manual echo.

BSD
								 January 22, 2004							       BSD
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