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(m4.info)Sysval

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Exit codes
==========

   To see whether a shell command succeeded, use `sysval':

     sysval

which expands to the exit status of the last shell command run with
`syscmd' or `esyscmd'.

     syscmd(`false')
     =>
     ifelse(sysval, 0, zero, non-zero)
     =>non-zero
     syscmd(`true')
     =>
     sysval
     =>0