Re: punctuation marks ?

["Oliver Elphick" <olly@lfix.co.uk>]

"Sibuyas Bombay" wrote:
  >anyway, how does a  `  differ from a  '  anyway ? ... and what are they call
      >ed
 
For full details look at the manpage for bash on quoting; for a
friendlier approach, look at the Debian Tutorial at www.debian.org.

Very briefly: ' is called single quote, ` is called backquote

bash has special characters, such as `, |, &, $ and so on.  If they are
enclosed in '', they cease to be special and become literal characters.

Anything enclosed in backquotes is treated as a command to run.  The
output of that command is substitued for the backquotes and everything
between them.

Like this:

bash-2.01$ cat /var/run/named.pid
287
bash-2.01$ ps p `cat /var/run/named.pid`
  PID TTY STAT TIME COMMAND
  287  ?  S    0:02 /usr/sbin/named 
bash-2.01$ ps p '`cat /var/run/named.pid`'
unrecognized option or trailing garbage
usage:  ps acehjlnrsSuvwx{t<tty>|#|O[-]u[-]U..} \
           --sort:[-]key1,[-]key2,...
           --help gives you this message
           --version prints version information
bash-2.01$ 

-- 
Oliver Elphick                                Oliver.Elphick@lfix.co.uk
Isle of Wight                              http://www.lfix.co.uk/oliver
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