鲁达 良许在工作中，写过一个 Shell 脚本，这个脚本可以从 4 个 NTP 服务器轮流获取时间，然后将最可靠的时间设置为系统时间。
因为我们对于时间的要求比较高，需要在短时间内就获取到正确的时间。所以我们就需要对这个脚本运行时间进行测试，看看从开始运行到正确设置时间需要花费多少时间。
其实在工作中，还有很多情况下需要测试一个脚本或者程序运行多少时间，特别是对于时间性要求比较高的系统更是如此。
对于时间的测试，我们可以用到一个命令：time 。下面我们就详细看看如何使用 time 命令来对脚本/命令进行测时。
1. time 命令基本用法
time 命令最基本的用法，就是 time + 命令 ，比如：
$ time ping baidu.com PING baidu.com ) 56(84) bytes of data. 64 bytes from 123.125.114.144 ): icmp_seq=1 ttl=56 time=2.83 ms 64 bytes from 123.125.114.144 ): icmp_seq=2 ttl=56 time=2.77 ms ………… ^C --- baidu.com ping statistics --- 8 packets transmitted, 8 received, 0% packet loss, time 10818ms rtt min/avg/max/mdev = 2.765 ms real 0m11.173s user 0m0.004s sys 0m0.002s在结果里，real 表示从我们执行 ping 命令到最终按 ctrl+c 终止这段时间所耗费的时间；user 及 sys 分别表示 ping 命令在用户空间及内核空间所运行的时间。
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2. 将时间信息写入文件
如果我们想把时间信息直接写入到文件，而不是显示在屏幕上，那么我们可以使用 -o 选项，并指定写入的文件路径。
$ /usr/bin/time -o /home/alvin ping baidu.com执行这个命令后，ping 命令的输出结果依然会在终端里，而 time 命令的结果就写入到我们所指定的 文件里。
-o 选项表示输出文件不存在就创建，如果存在的话就直接覆盖重写。如果我们不想覆盖重写，而是想追加在文件后面，我们可以使用 -a 选项。
$ /usr/bin/time -a /home/smart ping linoxide.com3. 显示更详细的时间信息
time 命令不带选项的话，显示的信息量比较少，如果我们想获得更详细的信息，那么我们可以使用 -v 选项。
$ /usr/bin/time -v ping baidu.com PING baidu.com ) 56(84) bytes of data. 64 bytes from 123.125.114.144 ): icmp_seq=1 ttl=56 time=2.75 ms 64 bytes from 123.125.114.144 ): icmp_seq=2 ttl=56 time=2.76 ms 64 bytes from 123.125.114.144 ): icmp_seq=3 ttl=56 time=2.85 ms 64 bytes from 123.125.114.144 ): icmp_seq=4 ttl=56 time=2.77 ms ^C --- baidu.com ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3300ms rtt min/avg/max/mdev = 2.751 ms Command being timed: "ping baidu.com" User time (seconds): 0.00 System time (seconds): 0.00 Percent of CPU this job got: 0% Elapsed (wall clock) time (h:mm:ss or m:ss): 0:03.64 Average shared text size (kbytes): 0 Average unshared data size (kbytes): 0 Average stack size (kbytes): 0 Average total size (kbytes): 0 Maximum resident set size (kbytes): 2140 Average resident set size (kbytes): 0 Major (requiring I/O) page faults: 0 Minor (reclaiming a frame) page faults: 626 Voluntary context switches: 10 Involuntary context switches: 0 Swaps: 0 File system inputs: 0 File system outputs: 0 Socket messages sent: 0 Socket messages received: 0 Signals delivered: 0 Page size (bytes): 4096 Exit status: 0这个结果信息就相当详细了，我们可以获取到足够多我们所需要的信息。
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4. 自定义输出格式
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我们可以这样自定义：
$ /usr/bin/time -f "Elapsed Time = %E, Inputs %I, Outputs %O" ping baidu.com PING baidu.com ) 56(84) bytes of data. 64 bytes from 220.181.38.148 ): icmp_seq=1 ttl=54 time=1.82 ms 64 bytes from 220.181.38.148 ): icmp_seq=2 ttl=54 time=1.86 ms ^C --- baidu.com ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3003ms rtt min/avg/max/mdev = 1.825 ms Elapsed Time = 0:03.92, Inputs 0, Outputs 0如果你想让输出的结果有换行，可以在对应的地方添加 \n ，比如：
$ /usr/bin/time -f "Elapsed Time = %E \n Inputs %I \n Outputs %O" ping baidu.com这样输出的结果就类似于这样：
Elapsed Time = 0:03.92 Inputs 0 Outputs 0