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Difference between revisions of "FAQ Where does System.out and System.err output go"
(New page: == Short answer == *System.out goes to stdout (file descriptor 1) * == A UNIX computer (including clones like Linux, BSD) users file descriptors to define the input and output streams. T...) |
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| − | == Short answer == | + | == Short answer == |
| − | *System.out goes to stdout (file descriptor 1) | + | *''System.out ''goes to ''stdout ''(file descriptor 1) |
| − | * | + | *''System.err ''goes to ''stderr ''(file descriptor 2) |
| − | == | + | == Long Answer == |
| − | stdin - the standard input stream has file descriptor 0 stdout - the standard output stream has file descriptor 1 stderr - the standard error stream has file descriptor 2 | + | A UNIX computer (including clones like Linux, BSD) users file descriptors to define the input and output streams. Three of them are hardcoded by the system and fixed: |
| + | |||
| + | *stdin - the standard input stream has file descriptor 0 | ||
| + | *stdout - the standard output stream has file descriptor 1 - this is used by ''System.out'' | ||
| + | *stderr - the standard error stream has file descriptor 2 - this is used by ''System.err'' | ||
| + | |||
| + | Normally stdin, stdout, stderr are initially attached to the console process, but this can be redirected by a programme. E.g. the stderr is redirected to a log file, that is stored separately or watched by another process. | ||
Latest revision as of 15:00, 1 May 2011
Short answer
- System.out goes to stdout (file descriptor 1)
- System.err goes to stderr (file descriptor 2)
Long Answer
A UNIX computer (including clones like Linux, BSD) users file descriptors to define the input and output streams. Three of them are hardcoded by the system and fixed:
- stdin - the standard input stream has file descriptor 0
- stdout - the standard output stream has file descriptor 1 - this is used by System.out
- stderr - the standard error stream has file descriptor 2 - this is used by System.err
Normally stdin, stdout, stderr are initially attached to the console process, but this can be redirected by a programme. E.g. the stderr is redirected to a log file, that is stored separately or watched by another process.