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Full Discussion: getting the path part of an argument
Top Forums Shell Programming and Scripting getting the path part of an argument Post 48946 by ropers on Monday 22nd of March 2004 11:38:17 AM
Old 03-22-2004
getting the path part of an argument
Seems I'm inundating this forum with questions, but anyway:

I am writing a script that should accept one and only one argument when called.

That argument should designate a file, either with path/filename or just filename.

Now to the difficult bit:

I want to figure out a way to store just the path in one variable and just the file name in another. I need this for subsequent manipulation.

I thought I should be able to do this with sed or awk, but I couldn't figure it out.
Also, I am fundamentally unsure whether it's a good idea to just look for the last "/" in the argument.

So I'm going to ask the one question I am starting to get famous for: is there a better way to achieve what I want?

The below code is what I currently have, giving you the context this is for, not tremendously important, but just so you can see where I'm going:
Code:
if [ $# -eq 1 ] && [ -r "$1" ] && [ -f "$1" ] && [ `wc -c "$1" | awk '{print $1}'` -gt 681574400 ]; then 
# I should add a check whether the current dir is writable 
	# there is only one parameter AND it\'s writable AND it\'s an ordinary file AND it\'s bigger than 650MB
	split -b650m "$1" "$1"'.carved.'
	#echo "last error:"
	#echo $?
	# check how split reacts when given a file smaller than 650MB
	
	slices=( $(ls . | grep "$1.carved." | grep -v "rejoin.$1") )
		
	# echo "Number of slices:"
	slice_count=${#slices[@]}
	# echo $slice_count
	
	echo "#!/bin/sh" > "rejoin.$1"
	index=1
	while [ "$index" -lt "$slice_count" ]; do
		echo "cat ${slices[$index]} >> ${slices[0]}" >> "rejoin.$1"
		let "index = $index + 1"
	done
	echo "mv ${slices[0]} \"$1\"" >> "rejoin.$1"
	echo "exit" >> "rejoin.$1"
	chmod 755 "rejoin.$1"
	echo "Generated rejoin script."

	exit 0;
else
	echo "carve - carves up a (large) file into 650MB pieces";
	echo
	echo "usage: carve <filename>";
	echo 
	echo "carve also generates a \"rejoin\" script for future reassembly"; 
	# That's because I want the user to have no excuse for not including a 
	# surefire rejoin script when putting these files somewhere.
	# We don't want some other user end up with a bunch of confusing files
	# s/he doesn't know how to deal with.
	# This "included" generation out of this script is also to minimize 
	# dependencies.
	exit 1
fi

 

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LEARN ABOUT OPENSOLARIS

noecho

echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME

       echo, noecho - enable/disable terminal echo

SYNOPSIS

       cc [ flag... ] file... -I /usr/xpg4/include  -L	/usr/xpg4/lib 
	-R  /usr/xpg4/lib  -lcurses  [ library... ]

       c89 [ flag... ] file... -lcurses [ library... ]

       #include <curses.h>

       int echo(void);

       int noecho(void);

DESCRIPTION

       The  echo()  function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially,
       curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control  soft-
       ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined.

RETURN VALUES

       Upon successful completion, these functions return OK. Otherwise, they return ERR.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5)

SunOS 5.11							    5 Jun 2002							    echo(3XCURSES)
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