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最新推荐文章于 2024-09-11 17:44:07 发布

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分类专栏： Linux 文章标签： linux date

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本文介绍如何在Linux系统中修改系统时间，并详细解释了PHP中exec函数返回的不同退出值的意义及其对应的错误类型。

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1. linux修改系统时间

date --set "2012/07/11 15:20" (年/月/日小时:分钟)

2. php exec返回值意义列表

Table D-1. "Reserved" Exit Codes

Exit Code Number	Meaning	Example	Comments
`1`	Catchall for general errors	let "var1 = 1/0"	Miscellaneous errors, such as "divide by zero"
`2`	Misuse of shell builtins (according to Bash documentation)		Seldom seen, usually defaults to exit code 1
`126`	Command invoked cannot execute		Permission problem or command is not an executable
`127`	"command not found"		Possible problem with `$PATH` or a typo
`128`	Invalid argument to exit	exit 3.14159	exit takes only integer args in the range 0 - 255(see footnote)
`128+n`	Fatal error signal "n"	kill -9 `$PPID` of script	`$?` returns 137 (128 + 9)
`130`	Script terminated by Control-C		Control-C is fatal error signal 2, (130 = 128 + 2, see above)
`255*`	Exit status out of range	exit -1	exit takes only integer args in the range 0 - 255