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Top Forums Shell Programming and Scripting While read line ignores the '\' in file content Post 302570927 by ygemici on Friday 4th of November 2011 04:49:27 PM
Old 11-04-2011
Quote:
Originally Posted by Prev
Thanks Ahamed, print -r worked fine for me.
uname -rs gave the version as
AIX 3

ygemici, the output of od -c is of the type :
Code:
0000220    P   ,       s   e   r   v   e   r       j   o   b  \n        
0000240    C   A   M   P   A   G   N   E 002   R   U   N   \   R   U   N
0000260    E   X   T   R   C   A   M   P   A   G   N   E   ,       s   e
0000300    q   u   e   n   c   e       j   o   b  \n                   C           
:
:
0000500    T   \   E   X   T   R   A   C   T   S   S   R   C   ,       s
0000520    e   r   v   e   r       j   o   b  \n           C   A   M   P
0000540    A   G   N   E 002   R   U   N   \   M   R   U   N   C   A   M
0000560    P   A   G   N   E   ,       s   e   q   u   e   n   c   e

Where ever there is 002 is where the 02 is replaced by ^B in the output file.

Thanks for your input.
i think,this character of seqs is interpreted as "Start of text(^B)" from your shell.
it(probably your ksh) reads "\ and 02" and "02" is equal "002" in octal.
so "002" chars is now like ^B (STX). and there is a backslash in front of its.
then this equal to "\^B".. \^B is a control character is predefined for specify "Start of text(^B)" on your terminal device interface
(like putty,securecrt,different ssh clients and really terms) and
actually these are defined in termcap, terminfo and curses(for ex python use this) and
as VT100+,VT102,VT125.Vt400,XtermXX as some standarts (like ANSI standard XXXXX) and
shells use these loads of this meanings to char sets (such as ASCII cntrol character sets [C0,C1,G0,G1..within the ranges-> 000 to 037 and 200 to 237 octal,and it varies to different character sets)

you can view some cchars for your term.
Code:
# stty -a

actually you can use echo "-E" but ksh does not support that..
as ahamed said,"print -r" is good way for prints their literal value while use read -r in ksh and ksh derivatives.

regards
ygemici
 

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read(3pm)						User Contributed Perl Documentation						 read(3pm)

NAME
OpaL::read - Perl extension for reading files and commands. SYNOPSIS
use OpaL::read qw(functions); No functions or variables are exported automaticly so you have to specify them here. DESCRIPTION
OpaL::read is used for reading files and commands. All functions are autoloaded so they will not be loaded into memory if you have not used them before. FUNCTIONS
readfile Reads the content of the specified file and returns a list with the all lines. USAGE: @foo = "readfile"($filename); readfileline Reads the first line of the specified file and returns a scalar with that line. USAGE: $foo = "readfileline"($filename); readscalarfile Reads the content of the specified file and returns a scalar with the entire content. USAGE: $foo = "readscalarfile"("filename"); readcommand Reads the content from the output of the specified command and returns a list with the all lines. USAGE: @foo = "readcommand"("command"); readcommandline Reads the first line from output of the specified command and returns a scalar with that line. USAGE: $foo = "readcommandline"("command)"; readscalarfile Reads the content for the output of the specified file and returns a scalar with the entire content. USAGE: $foo = "readscalarcommand"($command); AUTHOR
Ola Lundqvist <ola@inguza.com> SEE ALSO
perl(1). perl v5.10.1 2012-08-21 read(3pm)
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