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默认情况下，time 命令只输出 real，usr，sys 三个内容，如果我们想要个性化一些，算定义它的输出格式，time 命令也是支持的。time 命令支持的格式有很多，如下所示：
- C - Name and command line arguments used
- D - Average size of the process's unshared data area in kilobytes
- E - Elapsed time in a clock format
- F - Number of page faults
- I - Number of file system inputs by the process
- K - Average total memory use of the process in kilobytes
- M - Maximum resident set the size of the process during the lifetime in Kilobytes
- O - Number of file system outputs by the process
- P - Percentage of CPU that the job received
- R - Number of minor or recoverable page faults
- S - Total number of CPU seconds used by the system in kernel mode
- U - Total number of CPU seconds used by user mode
- W - Number of times the process was swapped out of main memory
- X - Average amount of shared text in the process
- Z - System's page size in kilobytes
- c - Number of times the process was context-switched
- e - Elapsed real time used by the process in seconds
- k - Number of signals delivered to the process
- p - Average unshared stack size of the process in kilobytes
- r - Number of socket messages received by the process
- s - Number of socket messages sent by the process
- t - Average resident set size of the process in kilobytes
- w - Number of time the process was context-switched voluntarily
- x - Exit status of the command
如果我们想要输出以下这样的格式：
- Elapsed Time = 0:01:00, Inputs 2, Outputs 1
（编辑：源码网）
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