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# shell_quote --- quote an argument for passing to the shell
#
# Michael Brennan
# brennan@madronabluff.com
# September 2014
function shell_quote(s, # parameter
SINGLE, QSINGLE, i, X, n, ret) # locals
{
if (s == "")
return "\"\""
SINGLE = "\x27" # single quote
QSINGLE = "\"\x27\""
n = split(s, X, SINGLE)
ret = SINGLE X[1] SINGLE
for (i = 2; i <= n; i++)
ret = ret QSINGLE SINGLE X[i] SINGLE
return ret
}