4.1 \u65f6\u95f4\u7ba1\u7406<\/p>\n\n\n\n
4.1.1 date<\/p>\n\n\n\n
\u65f6\u95f4\u7ba1\u7406\uff08\u7cfb\u7edf\u65f6\u95f4\uff09<\/p>\n\n\n\n
Linux: rtc\uff08\u786c\u4ef6\u65f6\u95f4\uff0c\u5b9e\u65f6\u65f6\u949f\uff09<\/p>\n\n\n\n
ntp\uff1a\u7f51\u7edc\u65f6\u95f4\u534f\u8bae\uff0c\u7f51\u7edc\u65f6\u95f4\u670d\u52a1\u5668<\/p>\n\n\n\n
\u786c\u4ef6\u65f6\u949f\uff1a\u7cfb\u7edf\u786c\u4ef6\u81ea\u52a8\u8fd0\u884c\u7684\u65f6\u95f4<\/p>\n\n\n\n
\u7cfb\u7edf\u65f6\u949f\uff1a\u64cd\u4f5c\u7cfb\u7edf\u5f00\u673a\u4ee5\u540e\u4f1a\u81ea\u52a8\u8ba1\u7b97\u51fa\u6765\u63a5\u4e0b\u6765\u7ecf\u8fc7\u7684\u65f6\u95f4<\/p>\n\n\n\n
\u7ec3\u4e60\uff1a<\/p>\n\n\n\n
\u4f7f\u7528date\u5355\u72ec\u83b7\u53d6\u7cfb\u7edf\u5f53\u524d\u7684\u5e74\u4efd\u3001\u6708\u4efd\u3001\u65e5\u3001\u5c0f\u65f6\u3001\u5206\u949f\u3001\u79d2<\/p>\n\n\n\n
[root@Daniel-R480 ~]# date<\/p>\n\n\n\n
Mon Jun 28 14:40:18 CST 2021<\/p>\n\n\n\n
[root@Daniel-R480 ~]# date +%y<\/p>\n\n\n\n
21<\/p>\n\n\n\n
[root@Daniel-R480 ~]# date +%m<\/p>\n\n\n\n
06<\/p>\n\n\n\n
[root@Daniel-R480 ~]# date +%d<\/p>\n\n\n\n
28<\/p>\n\n\n\n
[root@Daniel-R480 ~]# date +%s<\/p>\n\n\n\n
1624862439<\/p>\n\n\n\n
[root@Daniel-R480 ~]#<\/p>\n\n\n\n
4.1.2 hwclock<\/p>\n\n\n\n
\u663e\u793a\u786c\u4ef6\u65f6\u949f<\/p>\n\n\n\n
hwclock<\/p>\n\n\n\n
-w: \u8bbe\u7f6e\u786c\u4ef6\u65f6\u949f\u4e3a\u7cfb\u7edf\u65f6\u949f<\/p>\n\n\n\n
-s: \u8bbe\u7f6e\u7cfb\u7edf\u65f6\u949f\u4e3a\u786c\u4ef6\u65f6\u949f<\/p>\n\n\n\n
[root@Daniel-SHSH ~]# hwclock<\/p>\n\n\n\n
Mon 28 Jun 2021 02:42:43 PM CST -0.885496 seconds<\/p>\n\n\n\n
[root@Daniel-SHSH ~]# hwclock -w<\/p>\n\n\n\n
[root@Daniel-SHSH ~]# hwclock -s<\/p>\n\n\n\n
3\u3001cal<\/p>\n\n\n\n
\u65e5\u5386<\/p>\n\n\n\n
cal: calendar<\/p>\n\n\n\n
\u540e\u9762\u53ef\u52a0\u5e74\u4efd\uff0c\u6708\u4efd<\/p>\n\n\n\n
cal 6 2021<\/p>\n\n\n\n
[root@Daniel-SHSH ~]# cal<\/p>\n\n\n\n
June 2021 <\/p>\n\n\n\n
Su Mo Tu We Th Fr Sa<\/p>\n\n\n\n
1 2 3 4 5<\/p>\n\n\n\n
6 7 8 9 10 11 12<\/p>\n\n\n\n
13 14 15 16 17 18 19<\/p>\n\n\n\n
20 21 22 23 24 25 26<\/p>\n\n\n\n
27 28 29 30<\/p>\n\n\n\n
[root@Daniel-SHSH ~]# cal 3 2021<\/p>\n\n\n\n
March 2021 <\/p>\n\n\n\n
Su Mo Tu We Th Fr Sa<\/p>\n\n\n\n
1 2 3 4 5 6<\/p>\n\n\n\n
7 8 9 10 11 12 13<\/p>\n\n\n\n
14 15 16 17 18 19 20<\/p>\n\n\n\n
21 22 23 24 25 26 27<\/p>\n\n\n\n
28 29 30 31<\/p>\n\n\n\n
[root@Daniel-SHSH ~]# <\/p>\n\n\n\n
4.2 \u547d\u4ee4\u5e2e\u52a9<\/p>\n\n\n\n
4.2.1 \u5185\u90e8\u547d\u4ee4\uff1a<\/p>\n\n\n\n
help COMMAND<\/p>\n\n\n\n
[root@Daniel-SHSH ~]# help cd<\/p>\n\n\n\n
cd: cd [-L|[-P [-e]]] [dir]<\/p>\n\n\n\n
Change the shell working directory.<\/p>\n\n\n\n
Change the current directory to DIR. The default DIR is the value of the<\/p>\n\n\n\n
HOME shell variable<\/p>\n\n\n\n
4.2.2 \u5916\u90e8\u547d\u4ee4\uff1a<\/p>\n\n\n\n
COMMAND –help<\/p>\n\n\n\n
[root@Daniel-SHSH ~]# ls –help<\/p>\n\n\n\n
Usage: ls [OPTION]… [FILE]…<\/p>\n\n\n\n
List information about the FILEs (the current directory by default).<\/p>\n\n\n\n
Sort entries alphabetically if none of -cftuvSUX nor –sort is specified.<\/p>\n\n\n\n
4.2.3 \u547d\u4ee4\u624b\u518c\uff08\u51e0\u4e4e\u6240\u6709\u547d\u4ee4\u90fd\u6709\uff09\uff1amanual<\/p>\n\n\n\n
1\u3001man COMMAND<\/p>\n\n\n\n
\u67e5\u770b\u7528\u6237\u624b\u518c<\/p>\n\n\n\n
2\u3001whatis COMMAND<\/p>\n\n\n\n
\u67e5\u770b\u547d\u4ee4\u51fa\u73b0\u7684\u7ae0\u8282<\/p>\n\n\n\n
3\u3001MAN\u5206\u7ae0\u8282\uff1a<\/p>\n\n\n\n
\uff081\uff09\u7528\u6237\u547d\u4ee4(\/bin, \/usr\/bin, \/usr\/local\/bin)<\/p>\n\n\n\n
\uff082\uff09\u7cfb\u7edf\u8c03\u7528<\/p>\n\n\n\n
\uff083\uff09\u5e93\u7528\u6237<\/p>\n\n\n\n
\uff084\uff09\u7279\u6b8a\u6587\u4ef6(\u8bbe\u5907\u6587\u4ef6)<\/p>\n\n\n\n
\uff085\uff09\u6587\u4ef6\u683c\u5f0f(\u914d\u7f6e\u6587\u4ef6\u7684\u8bed\u6cd5)<\/p>\n\n\n\n
\uff086\uff09\u6e38\u620f<\/p>\n\n\n\n
\uff087\uff09\u6742\u9879(Miscellaneous)<\/p>\n\n\n\n
\uff088\uff09\u7ba1\u7406\u547d\u4ee4(\/sbin, \/usr\/sbin, \/usr\/local\/sbin\uff0c\u9700\u8981\u7ba1\u7406\u5458\u6743\u9650\u624d\u80fd\u4f7f\u7528)<\/p>\n\n\n\n
4\u3001\u6ce8\u91ca\u7b26\u542b\u4e49<\/p>\n\n\n\n
<>\uff1a\u5fc5\u9009<\/p>\n\n\n\n
[]\uff1a\u53ef\u9009<\/p>\n\n\n\n
…\uff1a\u53ef\u4ee5\u51fa\u73b0\u591a\u6b21<\/p>\n\n\n\n
|\uff1a\u591a\u9009\u4e00<\/p>\n\n\n\n
{}\uff1a\u5206\u7ec4<\/p>\n\n\n\n
5\u3001MAN\u7684\u8f93\u51fa\u5185\u5bb9<\/p>\n\n\n\n
NAME\uff1a\u547d\u4ee4\u540d\u79f0\u53ca\u529f\u80fd\u7b80\u8981\u8bf4\u660e<\/p>\n\n\n\n
SYNOPSIS\uff1a\u7528\u6cd5\u8bf4\u660e\uff0c\u5305\u62ec\u53ef\u7528\u7684\u9009\u9879<\/p>\n\n\n\n
DESCRIPTION\uff1a\u547d\u4ee4\u529f\u80fd\u7684\u8be6\u5c3d\u8bf4\u660e\uff0c\u53ef\u80fd\u5305\u62ec\u6bcf\u4e00\u4e2a\u9009\u9879\u7684\u610f\u4e49<\/p>\n\n\n\n
OPTIONS\uff1a\u8bf4\u660e\u6bcf\u4e00\u4e2a\u9009\u9879\u7684\u610f\u4e49<\/p>\n\n\n\n
FILES\uff1a\u6b64\u547d\u4ee4\u76f8\u5173\u7684\u914d\u7f6e\u6587\u4ef6<\/p>\n\n\n\n
BUGS\uff1a<\/p>\n\n\n\n
EXAMPLES\uff1a\u4f7f\u7528\u793a\u4f8b<\/p>\n\n\n\n
SEE ALSO\uff1a\u53e6\u5916\u53c2\u7167<\/p>\n\n\n\n
6\u3001\u4e00\u4e9b\u57fa\u672c\u64cd\u4f5c<\/p>\n\n\n\n
\uff081\uff09 \u7ffb\u5c4f<\/p>\n\n\n\n
\u5411\u540e\u7ffb\u4e00\u5c4f\uff1aSPACE<\/p>\n\n\n\n
\u5411\u524d\u7ffb\u4e00\u5c4f\uff1ab<\/p>\n\n\n\n
\u5411\u540e\u7ffb\u4e00\u884c\uff1aENTER<\/p>\n\n\n\n
\u5411\u524d\u7ffb\u4e00\u884c\uff1ak<\/p>\n\n\n\n
\uff082\uff09\u67e5\u627e<\/p>\n\n\n\n
\/KEYWORD: \u5411\u540e<\/p>\n\n\n\n
n: \u4e0b\u4e00\u4e2a<\/p>\n\n\n\n
N\uff1a\u524d\u4e00\u4e2a <\/p>\n\n\n\n
?KEYWORD\uff1a\u5411\u524d<\/p>\n\n\n\n
q: \u9000\u51fa<\/p>\n\n\n\n
\uff083\uff09\u5728\u7ebf\u6587\u6863<\/p>\n\n\n\n
info COMMAND<\/p>\n\n\n\n
\uff084\uff09\u6587\u6863<\/p>\n\n\n\n
\/usr\/share\/doc<\/p>\n\n\n\n
\u9996\u9009\u6587\u6863\uff1a \u4e00\u822c\u8f6f\u4ef6\u6216\u8005\u9879\u76ee\u90fd\u6709\u7740\u5b98\u65b9\u5728\u7ebf\u8bf4\u660e\uff0c<\/p>\n\n\n\n
\u6bd4\u5982apache, hadoop<\/p>\n\n\n\n
\u7ec3\u4e60\uff1a<\/p>\n\n\n\n
1\u3001echo\u662f\u5185\u90e8\u547d\u4ee4\u8fd8\u662f\u5916\u90e8\u547d\u4ee4\uff1f<\/p>\n\n\n\n
[root@Daniel-R480 ~]# help echo<\/p>\n\n\n\n
echo: echo [-neE] [arg …]<\/p>\n\n\n\n
Write arguments to the standard output.<\/p>\n\n\n\n
2\u3001\u5176\u4f5c\u7528\uff1f<\/p>\n\n\n\n
Write arguments to the standard output.<\/p>\n\n\n\n
3\u3001\u5982\u4f55\u663e\u793a\u201cThe year is 2013. Today is 26.\u201d\u4e3a\u4e24\u884c\uff1f<\/p>\n\n\n\n
echo -e “This year is 2013.\\nToday is 26.”<\/p>\n\n\n\n
\\\u8f6c\u4e49\u7b26<\/p>\n\n\n\n
\u8f6c\u4e49\uff0c\u9003\u9038<\/p>\n\n\n\n
\u7ec3\u4e60\uff1a<\/p>\n\n\n\n
1\u3001printf\u662f\u5185\u90e8\u547d\u4ee4\u8fd8\u662f\u5916\u90e8\u547d\u4ee4\uff1f <\/p>\n\n\n\n
[root@Daniel-R480 ~]# help printf<\/p>\n\n\n\n
printf: printf [-v var] format [arguments]<\/p>\n\n\n\n
Formats and prints ARGUMENTS under control of the FORMAT.<\/p>\n\n\n\n
2\u3001\u5176\u4f5c\u7528\uff1f<\/p>\n\n\n\n
Formats and prints ARGUMENTS under control of the FORMAT.<\/p>\n\n\n\n
3\u3001\u5982\u4f55\u663e\u793a\u201cThe year is 2013. Today is 26.\u201d\u4e3a\u4e24\u884c\uff1f<\/p>\n\n\n\n
printf “The year is 2013.\\nToday is 26.\\n”<\/p>\n","protected":false},"excerpt":{"rendered":"
4.1 \u65f6\u95f4\u7ba1\u7406 4.1.1 date & […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-398","post","type-post","status-publish","format-standard","hentry","category-linux"],"aioseo_notices":[],"views":447,"_links":{"self":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts\/398","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=398"}],"version-history":[{"count":2,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts\/398\/revisions"}],"predecessor-version":[{"id":709,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts\/398\/revisions\/709"}],"wp:attachment":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=398"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=398"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=398"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}