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Gcal produces the following exit codes:
127
-
Request for help screen, software license or program version (adjustable).
126
-
Invalid command line argument / option.
125
-
Year out of range for computing the Easter Sunday's date.
124
-
Virtual memory exhausted.
123
-
Invalid date part in resource file or in include file.
122
-
Invalid month field entry in resource file or in include file.
121
-
Invalid day field entry in resource file or in include file.
120
-
Malformed #include statement in resource file or in include file.
119
-
Illegal recursive/cyclic #include statement in resource file
or in include file.
118
-
Resource file or include file not found.
117
-
Invalid n'th weekday field (only 1...5 or 9 valid).
116
-
Missing whitespace separator character between date part
and text part.
115
-
Response file respectively shell script can't be written.
114
-
Invalid date variable operation.
113
-
Referenced date variable undefined.
112
-
Invalid date value assigned to date variable.
111
-
Sending output to eMail address have failed.
110
-
Internal error, C function pipe(), fork(), execlp() or unlink() have failed.
109
-
Error reading resource, include respectively response file.
108
-
Illegal character found in response file.
107
-
Internal error, invalid value for the size of an internal table occurred.
106
-
Invalid date format text specified.
105
-
Invalid text variable definition.
104
-
Invalid regular expression search pattern specified.
3
-
Program aborted by signal.
2
-
Exit code not equal zero returned by external command.
1
-
Activated `-c|C[]',
`-f|F name[+...]' or `-# line'
option caused no output of resource file entries.
0
-
Normal program termination.
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