end

# Escapes a string so that it can be safely used in a Bourne shell

#

# Note that a resulted string should be used unquoted and is not

# intended for use in double quotes nor in single quotes.

# Multibyte characters are treated as multibyte characters, not

# bytes.

def shellescape(str)

# An empty argument will be skipped, so return empty quotes.

return "''" if str.empty?

end

# Builds a command line string from an argument list +array+ joining

#

# open('|' + Shellwords.join(['grep', pattern, *files])) { |pipe|

# # ...

# # ...

# }

#

def shelljoin(array)

array.map { |arg| shellescape(arg) }.join(' ')

end