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Shell Programming and Scripting

escape characterz...

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# 1  
Old 11-03-2006
escape characterz...
hey
i wanted to know if there is some single unix command to replace all the character escape sequences with their "C" values in a string...
The only way i know is repetatively kepp using the grep command for each one.
# 2  
Old 11-03-2006
put some example !!!
# 3  
Old 11-04-2006
EXample...
Whenever we have a \" we need to replace it with a ",if s[j]=='\\' and s[j+1]=='n' then replace it by='\n'..
Character Escape Sequence
" \"
' \'
? \?
\ \\
BEL \a
BS \b
FF \f
NL \n
CR \r
HT \t
VT \v
# 4  
Old 11-06-2006
An awk solution :
Code:
BEGIN {
   c["\""] = "\""; c["'"] = "'" ; c["?"] = "?" ; c["\\"] = "\\";
   c["a"]  = "\a"; c["b"] = "\b"; c["f"] = "\f"; c["\n"] = "\n";
   c["r"]  = "\r"; c["t"] = "\t"; c["v"] = "\v";
}
{
   old_line = $0;
   new_line = "";
   while (match (old_line, /\\/)) {
     new_line = new_line substr(old_line, 1, RSTART-1) c[substr(old_line, RSTART+1, 1)];
     old_line = substr(old_line, RSTART+2);
   }
   new_line = new_line old_line;
   print new_line;
}

To convert a file :
Code:
awk -f awk_script input_file > output_file

I hope that there is a simplest way to do the work Smilie

Jean-Pierre.
# 5  
Old 11-06-2006
escape..
I want the code in shell script using the sed command..
i think it looks like
echo madhu\\shri\sgar\mi\ | sed -e 's/"\\"/"\"/g' -e ' s/\"/"/' -e 's/\'/'/' -e ' s/\?/?/' -e 's/\a/BEL/' -e ' s/\b/BS/' -e 's/\f/FF/' -e ' s/\n/NL/' -e 's/\r/CR/' -e 's/\t/HT/' -e 's/\v/VT/'
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