{"id":873,"date":"2007-10-19T09:24:42","date_gmt":"2007-10-19T09:24:42","guid":{"rendered":"http:\/\/www.msinterdev.org\/wp\/2007\/10\/19\/crontab\/"},"modified":"2007-10-19T09:24:42","modified_gmt":"2007-10-19T09:24:42","slug":"crontab","status":"publish","type":"post","link":"http:\/\/www.msinterdev.org\/wp\/2007\/10\/19\/crontab\/","title":{"rendered":"CRONTAB"},"content":{"rendered":"

\uadf8\ub0e5 \uc258\ub85c\ub9cc \uc9dc\uc57c \ud55c\ub2e4\uba74 \ub2e4\uc74c\uacfc \uac19\uc774 \ud558\uba74 \ub429\ub2c8\ub2e4.<\/p>\n

#!\/bin\/sh<\/p>\n

while [
\n1 ]; do
    echo “Hello World!”
    sleep 1
done<\/font><\/p>\n

\uc704\uc5d0\uc11c
\nsleep<\/b>\uc740 <\/font>\/bin<\/font> \ub514\ub809\ud1a0\ub9ac\uc5d0 \uc788\ub294 \uc2e4\ud589\ud30c\uc77c\uc785\ub2c8\ub2e4. argument\ub85c \uc2dc\uac04\uc744 \uc904
\n\uc218 \uc788\uace0, \uadf8\ub0e5 \uc22b\uc790\ub9cc \ub123\uc73c\uba74 ‘\ucd08’\ub97c \ub098\ud0c0\ub0c5\ub2c8\ub2e4. \ud558\uc9c0\ub9cc ‘m’, ‘h’, ‘d’ \ub97c \uc22b\uc790 \ub4a4\uc5d0 \ubd99\uc5ec\uc11c \uac01\uac01 \ubd84, \uc2dc\uac04, \uc77c\uc744 \uc9c0\uc815\ud574\uc904 \uc218\ub3c4
\n\uc788\ub2f5\ub2c8\ub2e4.<\/p>\n

#
\n<\/font>sleep
\n30m<\/font>
\uc608\ub97c \ub4e4\uc5b4 \uc774\uc640 \uac19\uc774 \uc2e4\ud589\ud558\uac8c \ub418\uba74 30\ubd84\uc744 \uc26c\ub294 \uac83\uc785\ub2c8\ub2e4.<\/p>\n

\uadf8\ub7fc \uc704\uc5d0 \uc791\uc131\ud55c \ud30c\uc77c\uc744 \ub370\ubaac\uc73c\ub85c (PPID\uac00
\ninit\uc758 PID\uc778 1\ub85c) \ub744\uc6b0\ub294 \ubc29\ubc95\uc785\ub2c8\ub2e4. \ub9cc\uc57d \uc704 \ud30c\uc77c\uc744 sample.sh<\/b>\ub77c\uace0 \uac00\uc815\ud55c\ub2e4\uba74,<\/p>\n

# <\/font>.\/sample.sh
\n>\/dev\/null 2>&1 &<\/font><\/p>\n

\uc774\uc640 \uac19\uc740 \ubc29\ubc95\uc73c\ub85c \ub370\ubaac\uc73c\ub85c \ub9cc\ub4e4 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uadf8\ub0e5 \ud30c\uc77c
\n\uc774\ub984 \ub4a4\uc5d0 &<\/b> (AMPERSAND)\ub9cc \ubd99\uc774\uac8c \ub418\uba74 \ub4b7\ubc30\uacbd\uc5d0\uc11c \ub744\uc6b0\uaca0\ub2e4\ub294 \uc758\ubbf8\uc785\ub2c8\ub2e4. \uadf8\ub7ec\ub098 \uc77c\ubc18 \ub370\ubaac\uc774 \uadf8\ub807\ub4ef
\n>\/dev\/null<\/b>\ub97c \uc0ac\uc6a9\ud574\uc11c stdout<\/b>\uc744 null \ub514\ubc14\uc774\uc2a4\ub85c \ubf51\uace0 2>&1<\/b>\ub85c
\nstderr<\/b>\ub3c4 stdout<\/b>\uacfc \ub9c8\ucc2c\uac00\uc9c0\ub85c null \ub514\ubc14\uc774\uc2a4\ub85c \ubf51\uc544\uc11c \uc5c6\uc560\ubc84\ub9ac\ub294 \uac83\uc785\ub2c8\ub2e4.<\/p>\n

\uc774\ub807\uac8c \ud55c \ud6c4\uc5d0\ub294
\n\ud604\uc7ac \uc811\uc18d\ud55c login \uc138\uc158\uc73c\ub85c\ubd80\ud130 \uc811\uc18d\uc744 \uc885\ub8cc \ud55c \ud6c4\uc5d0 \ub2e4\uc2dc \uc811\uc18d\uc744 \ud558\uba74 \ub429\ub2c8\ub2e4. \uc811\uc18d\uc774 \ub04a\uc5b4\uc9c0\uba74 \ub4b7\ubc30\uacbd\uc5d0\uc11c \ub3cc\ub358 sample.sh\uac00 \uc6d0\ub798
\nPPID\uc600\ub358 \uc258\uc774 \uc885\ub8cc\ub418\ubbc0\ub85c \uc790\uc2e0\uc758 PARENT\ub97c \uc783\uc5b4\ubc84\ub9ac\uace0 \uadf8 \uc258\uc758 PID\uc778 init\uc758 PID, \uc989 1\uc5d0 \uc885\uc18d\ub418\uac8c
\n\ub418\uc8e0.<\/p>\n

#
\n<\/font>ps -ef
\n|grep sample<\/font>
<\/font>paul    28155    1  0 12:56 ?    00:00:00 .\/sample.sh<\/font><\/p>\n

\uadf8\ub7fc
\n\uc774\uc81c \uac70\uc758 \uc644\ubcbd\ud55c \ub370\ubaac\uc774 \ub41c \uac83\uc785\ub2c8\ub2e4. (^-^ \ud83d\ude09<\/p>\n","protected":false},"excerpt":{"rendered":"

\uadf8\ub0e5 \uc258\ub85c\ub9cc \uc9dc\uc57c \ud55c\ub2e4\uba74 \ub2e4\uc74c\uacfc \uac19\uc774 \ud558\uba74 \ub429\ub2c8\ub2e4. #!\/bin\/sh while [ 1 ]; do    echo “Hello World!”    sleep 1done \uc704\uc5d0\uc11c sleep\uc740 \/bin \ub514\ub809\ud1a0\ub9ac\uc5d0 \uc788\ub294 \uc2e4\ud589\ud30c\uc77c\uc785\ub2c8\ub2e4. argument\ub85c \uc2dc\uac04\uc744 \uc904 \uc218 \uc788\uace0, \uadf8\ub0e5 \uc22b\uc790\ub9cc \ub123\uc73c\uba74 ‘\ucd08’\ub97c \ub098\ud0c0\ub0c5\ub2c8\ub2e4. \ud558\uc9c0\ub9cc ‘m’, ‘h’, ‘d’ \ub97c \uc22b\uc790 \ub4a4\uc5d0 \ubd99\uc5ec\uc11c \uac01\uac01 \ubd84, \uc2dc\uac04, \uc77c\uc744 \uc9c0\uc815\ud574\uc904 \uc218\ub3c4 \uc788\ub2f5\ub2c8\ub2e4. # sleep 30m\uc608\ub97c […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[548],"tags":[],"class_list":["post-873","post","type-post","status-publish","format-standard","hentry","category-about-knowledge-os_unix"],"_links":{"self":[{"href":"http:\/\/www.msinterdev.org\/wp\/wp-json\/wp\/v2\/posts\/873","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.msinterdev.org\/wp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.msinterdev.org\/wp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.msinterdev.org\/wp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.msinterdev.org\/wp\/wp-json\/wp\/v2\/comments?post=873"}],"version-history":[{"count":0,"href":"http:\/\/www.msinterdev.org\/wp\/wp-json\/wp\/v2\/posts\/873\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.msinterdev.org\/wp\/wp-json\/wp\/v2\/media?parent=873"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.msinterdev.org\/wp\/wp-json\/wp\/v2\/categories?post=873"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.msinterdev.org\/wp\/wp-json\/wp\/v2\/tags?post=873"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}