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(gettext.info.gz) python-format

 
 15.3.3 Shell Format Strings
 ---------------------------
 
 Shell format strings, as supported by GNU gettext and the `envsubst'
 program, are strings with references to shell variables in the form
 `$VARIABLE' or `${VARIABLE}'.  References of the form
 `${VARIABLE-DEFAULT}', `${VARIABLE:-DEFAULT}', `${VARIABLE=DEFAULT}',
 `${VARIABLE:=DEFAULT}', `${VARIABLE+REPLACEMENT}',
 `${VARIABLE:+REPLACEMENT}', `${VARIABLE?IGNORED}',
 `${VARIABLE:?IGNORED}', that would be valid inside shell scripts, are
 not supported.  The VARIABLE names must consist solely of alphanumeric
 or underscore ASCII characters, not start with a digit and be nonempty;
 otherwise such a variable reference is ignored.
 

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