Merged revisions 80030,80067,80069,80080-80081,80084,80432-80433,80465-80470,81059,81065-81067 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

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  r80030 | georg.brandl | 2010-04-13 08:43:54 +0200 (Di, 13 Apr 2010) | 1 line

  Get rid of multi-row cells.
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  r80067 | georg.brandl | 2010-04-14 10:53:38 +0200 (Mi, 14 Apr 2010) | 1 line

  #5341: typo.
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  r80069 | georg.brandl | 2010-04-14 15:50:31 +0200 (Mi, 14 Apr 2010) | 1 line

  Add an x-ref to where the O_ constants are documented and move the SEEK_ constants after lseek().
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  r80080 | georg.brandl | 2010-04-14 21:16:38 +0200 (Mi, 14 Apr 2010) | 1 line

  #8399: add note about Windows and O_BINARY.
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  r80081 | georg.brandl | 2010-04-14 23:34:44 +0200 (Mi, 14 Apr 2010) | 1 line

  #5250: document __instancecheck__ and __subclasscheck__.  I hope the part about the class/metaclass distinction is understandable.
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  r80084 | georg.brandl | 2010-04-14 23:46:45 +0200 (Mi, 14 Apr 2010) | 1 line

  Fix missing.
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  r80432 | georg.brandl | 2010-04-24 10:56:58 +0200 (Sa, 24 Apr 2010) | 1 line

  Markup fixes.
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  r80433 | georg.brandl | 2010-04-24 11:08:10 +0200 (Sa, 24 Apr 2010) | 1 line

  #7507: quote "!" in pipes.quote(); it is a special character for some shells.
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  r80465 | georg.brandl | 2010-04-25 12:29:17 +0200 (So, 25 Apr 2010) | 1 line

  Remove LaTeXy index entry syntax.
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  r80466 | georg.brandl | 2010-04-25 12:54:42 +0200 (So, 25 Apr 2010) | 1 line

  Patch from Tim Hatch: Better cross-referencing in socket and winreg docs.
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  r80467 | georg.brandl | 2010-04-25 12:55:16 +0200 (So, 25 Apr 2010) | 1 line

  Patch from Tim Hatch: Remove reference to winreg being the fabled high-level registry interface.
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  r80468 | georg.brandl | 2010-04-25 12:55:58 +0200 (So, 25 Apr 2010) | 1 line

  Patch from Tim Hatch: Minor spelling changes to _winreg docs.
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  r80469 | georg.brandl | 2010-04-25 12:56:41 +0200 (So, 25 Apr 2010) | 1 line

  Fix code example to have valid syntax so that it can be highlighted.
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  r80470 | georg.brandl | 2010-04-25 12:57:15 +0200 (So, 25 Apr 2010) | 1 line

  Patch from Tim Hatch: Make socket setblocking <-> settimeout examples symmetric.
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  r81059 | georg.brandl | 2010-05-10 23:02:51 +0200 (Mo, 10 Mai 2010) | 1 line

  #8642: fix wrong function name.
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  r81065 | georg.brandl | 2010-05-10 23:46:50 +0200 (Mo, 10 Mai 2010) | 1 line

  Fix reference direction.
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  r81066 | georg.brandl | 2010-05-10 23:50:57 +0200 (Mo, 10 Mai 2010) | 1 line

  Consolidate deprecation messages.
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  r81067 | georg.brandl | 2010-05-10 23:51:33 +0200 (Mo, 10 Mai 2010) | 1 line

  Fix typo.
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1 files changed, 6 insertions, 11 deletions

diff --git a/Lib/pipes.py b/Lib/pipes.py
index deab815a7c7..51666a8ae77 100644
--- a/Lib/pipes.py
+++ b/Lib/pipes.py
@@ -249,11 +249,11 @@ def makepipeline(infile, steps, outfile):
 
 # Reliably quote a string as a single argument for /bin/sh
 
-_safechars = string.ascii_letters + string.digits + '!@%_-+=:,./' # Safe unquoted
-_funnychars = '"`$\\'                           # Unsafe inside "double quotes"
+# Safe unquoted
+_safechars = frozenset(string.ascii_letters + string.digits + '@%_-+=:,./')
 
 def quote(file):
-    ''' return a shell-escaped version of the file string '''
+    """Return a shell-escaped version of the file string."""
     for c in file:
         if c not in _safechars:
             break
@@ -261,11 +261,6 @@ def quote(file):
         if not file:
             return "''"
         return file
-    if '\'' not in file:
-        return '\'' + file + '\''
-    res = ''
-    for c in file:
-        if c in _funnychars:
-            c = '\\' + c
-        res = res + c
-    return '"' + res + '"'
+    # use single quotes, and put single quotes into double quotes
+    # the string $'b is then quoted as '$'"'"'b'
+    return "'" + file.replace("'", "'\"'\"'") + "'"