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Re: bash Shell - escapes

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On Tue, May 10, 2016 at 11:20:23AM +0200, Die Optimisten wrote:
> On 2016-05-10 11:18, Die Optimisten wrote:
> >Hi,
> >
> >How can I escape a ' inside '...'
> >e.g. perl -e 'print '$ and a' '    # I don't want to use "

The short answer is... you can't. Quoting from the bash man page:

  "Enclosing characters in single quotes preserves the  literal  value  of
   each character within the quotes.  A single quote may not occur between
   single quotes, even when preceded by a backslash"

The long answer is... this woldn't be a shell if there were no useful
workarounds.

The trick in this situation is just to break up the string. Be aware
that to a shell, everything is text, so foo, "foo" and 'foo' are all
(in some way) equivalent.

This would work:

   perl -e 'print '"'"'$ and a'"'"' '    # I don't want to use "

That is, you glue your string out of several parts, here separated
by spaces; only the embedded ' are quoted by "":

   'print '  "'"  '$ and a'  "'"  ' '

Of course, in practice you wouldn't do that blind transform, but
optimize it a bit, e.g.:

   "print '"'$'" and ax ' "

I.e. just use the '' where you need 'em

Then, you can escape the $ whithin the "" with a \

Lots of ways, use whatever is most readable.

hth
- -- tomás
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Shell - escapes Die Optimisten <inform@die-optimisten.net> - 2016-05-10 11:40 +0200
  bash Shell - escapes Die Optimisten <inform@die-optimisten.net> - 2016-05-10 11:40 +0200
    Re: bash Shell - escapes <tomas@tuxteam.de> - 2016-05-10 12:20 +0200
      Re: Shell - escapes "Thomas Schmitt" <scdbackup@gmx.net> - 2016-05-10 13:10 +0200
        Re: Shell - escapes <tomas@tuxteam.de> - 2016-05-10 13:30 +0200
  Re: Shell - escapes Mark Fletcher <mark27q1@gmail.com> - 2016-05-10 12:10 +0200
    Re: Shell - escapes "Thomas Schmitt" <scdbackup@gmx.net> - 2016-05-10 12:50 +0200
      Re: Shell - escapes Die Optimisten <inform@die-optimisten.net> - 2016-05-10 14:20 +0200
        Re: Shell - escapes <tomas@tuxteam.de> - 2016-05-10 14:30 +0200
          Re: Shell - escapes Mark Fletcher <mark27q1@gmail.com> - 2016-05-10 15:20 +0200
            Re: Shell - escapes David Wright <deblis@lionunicorn.co.uk> - 2016-05-10 16:00 +0200
            Re: Shell - escapes Mart van de Wege <mvdwege@gmail.com> - 2016-05-12 10:10 +0200
          Re: Shell - escapes tomas@tuxteam.de - 2016-05-10 15:30 +0200
        Re: Shell - escapes "Thomas Schmitt" <scdbackup@gmx.net> - 2016-05-10 16:20 +0200
          Re: Shell - escapes David Wright <deblis@lionunicorn.co.uk> - 2016-05-10 16:30 +0200
            Re: Shell - escapes "Thomas Schmitt" <scdbackup@gmx.net> - 2016-05-10 16:50 +0200
          Re: Shell - escapes <tomas@tuxteam.de> - 2016-05-10 16:40 +0200
  Re: Shell - escapes shawn wilson <ag4ve.us@gmail.com> - 2016-05-10 12:20 +0200
  Re: Shell - escapes Frédéric Marchal <frederic.marchal@wowtechnology.com> - 2016-05-10 12:30 +0200
  Re: Shell - escapes Andy Smith <andy@strugglers.net> - 2016-05-10 15:40 +0200
    Re: Shell - escapes <tomas@tuxteam.de> - 2016-05-10 16:00 +0200
    Re: Shell - escapes David Christensen <dpchrist@holgerdanske.com> - 2016-05-11 05:50 +0200

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