Difference between ' and ` ...? Post: 302511459

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Top Forums UNIX for Dummies Questions & Answers Difference between ' and ` ...? Post 302511459 by fpmurphy on Wednesday 6th of April 2011 08:45:36 PM

04-06-2011

Registered User

Assuming the question was asked in terms of shell syntax ....

All characters enclosed between a pair of single quote marks ('') that is
not preceded by a $ are quoted. A single quote cannot appear within
the single quotes. Quoted characters are not subject to parameter,
variable or command substitution.

A single quoted string preceded by an unquoted $ is processed as an
ANSI-C string except for the following:
\0 Causes the remainder of the string to be ignored.
\E Equivalent to the escape character (ascii 033),
\e Equivalent to the escape character (ascii 033),
\cx Expands to the character control-x.
\C[.name.] Expands to the collating element name.

A pair of grave accents (`...` aka backquotes) denotes command substitution
(AKA subshell) The more modern syntax is $(...).

fpmurphy

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LEARN ABOUT MOJAVE

lessecho

LESSECHO(1)						      General Commands Manual						       LESSECHO(1)

NAME

       lessecho - expand metacharacters

SYNOPSIS

       lessecho [-ox] [-cx] [-pn] [-dn] [-mx] [-nn] [-ex] [-a] file ...

DESCRIPTION

       lessecho  is  a program that simply echos its arguments on standard output.  But any metacharacter in the output is preceded by an "escape"
       character, which by default is a backslash.

OPTIONS

       A summary of options is included below.

       -ex    Specifies "x", rather than backslash, to be the escape char for metachars.  If x is "-", no escape char is used and  arguments  con-
	      taining metachars are surrounded by quotes instead.

       -ox    Specifies "x", rather than double-quote, to be the open quote character, which is used if the -e- option is specified.

       -cx    Specifies "x" to be the close quote character.

       -pn    Specifies "n" to be the open quote character, as an integer.

       -dn    Specifies "n" to be the close quote character, as an integer.

       -mx    Specifies "x" to be a metachar.  By default, no characters are considered metachars.

       -nn    Specifies "n" to be a metachar, as an integer.

       -fn    Specifies "n" to be the escape char for metachars, as an integer.

       -a     Specifies that all arguments are to be quoted.  The default is that only arguments containing metacharacters are quoted

SEE ALSO

       less(1)

AUTHOR

       This manual page was written by Thomas Schoepf <schoepf@debian.org>, for the Debian GNU/Linux system (but may be used by others).

       Send bug reports or comments to bug-less@gnu.org.

							     Version 487: 25 Oct 2016						       LESSECHO(1)

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