1, first understand the meaning of 1 and 2 represent in Linux
| name | Code | Operators | Java said | Under Linux file descriptor (Debian, for example) |
| stdin (standard input) | 0 | < 或 << | System.in | /dev/stdin -> /proc/self/fd/0 -> /dev/pts/0 |
| stdout (standard output) | 1 | >, >>, 1> 或 1>> | System.out | /dev/stdout -> /proc/self/fd/1 -> /dev/pts/0 |
| stderr (standard error) | 2 | 2> or 2 >> | System.err | /dev/stderr -> /proc/self/fd/2 -> /dev/pts/0 |
2, the meaning of the 2> & 1
The standard error output is redirected to standard output.
Symbols> & a whole.
3, the output log file and view
cd to the directory xxx.jar execution:
Java -jar xxx.jar the nohup> xxx.log> 2> &. 1 & - log write operation to the jar package and the xxx.log
-f xxx.log tail - view the log file