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Top Forums Shell Programming and Scripting bash: How to reuse the search result of "find" Post 302609315 by Chubler_XL on Monday 19th of March 2012 04:45:55 PM
Old 03-19-2012
I think it's at assignment:

Code:
$ T=$(printf "A\x0B")
$ echo ${#T}
2
 
$ T=$(echo "AAA" | sed "s:A:\x0:"g)
$ echo ${#T}
0

I suspect bash uses the standard C string functions to deal with it's env vars, and they use NULL as a terminator. One could imagine that re-implementing a new string object that supported imbedded NULL chars wouldn't be worth the effort.


BTW, the contents of named pipes aren't stored in the Filesystem (the file is only a pointer, much like a /dev/ file, the actual data is stored in memory).

Also, how about using the -e sed param in PercentizeNull() and DepercentizeNull() to reduce the number of sed processes run:
Code:
PercentizeNull()
{
  sed -e "s/%/%25/g" -e "s/\x0/%00/g"
}


Last edited by Chubler_XL; 03-19-2012 at 06:07 PM..
This User Gave Thanks to Chubler_XL For This Post:
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.11 3 Aug 1994 echo(1B)
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