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Info Catalog
(m4.info) Esyscmd
(m4.info) UNIX commands
(m4.info) Maketemp
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
Info Catalog
(m4.info) Esyscmd
(m4.info) UNIX commands
(m4.info) Maketemp