On 07/27/2017 10:10 AM, Bosco wrote: > That script of zziplib isn't mine, I only had to compile it once > because it was necessary for compile other program (TeX Live). > > I'm not talking about POSIX, and I don't mind what it said. I'm > talking about the man page of dash, that said: > > when \\ is reached is replaced by \. When \\ is reached AS THE ARGUMENT to echo. > Then, in the command > echo \\\\ > because \\ is reached first, then it will be replaced by '\' No, you are demonstrating a gap in your understanding of shell quoting rules. echo \\\\ echo "\\\\" echo '\\' echo '\'"\\" are all the same way to pass the two-character argument to echo. That two-character argument is a valid escape sequence, which in turn means echo outputs a single \ character then a newline. > character, immediately after that another \\ is reached, then it will > be replaced by another '\' character. It turns out the ouput '\\'. If you want two \ as output, you have to pass four characters (not two) to echo, so your input has to be one of these (or other) valid quotings: echo '\\\\' echo "\\\\\\\\" echo \\'\'"\\"\\'\'"\\"\\'\' etc. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
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