{"id":19530,"date":"2017-04-24T06:14:18","date_gmt":"2017-04-23T22:14:18","guid":{"rendered":"https:\/\/2blog.ilc.edu.tw\/25793\/2017\/04\/24\/awk-%e5%82%99%e5%bf%98\/"},"modified":"2017-04-24T06:14:18","modified_gmt":"2017-04-23T22:14:18","slug":"awk-%e5%82%99%e5%bf%98","status":"publish","type":"post","link":"https:\/\/2blog.ilc.edu.tw\/25793\/2017\/04\/24\/awk-%e5%82%99%e5%bf%98\/","title":{"rendered":"awk \u5099\u5fd8"},"content":{"rendered":"

\u5217\u51fa UID > 499 \u7684\u5e33\u865f\u53ca UID
$ awk ‘BEGIN {FS=”:”}; $3 > 499 {print $1″t”$3}’ \/etc\/passwd<\/span>
core\u00a0\u00a0\u00a0 500<\/span>
systemd-coredump\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 998<\/span> <\/p>\n

\u53bb\u9664\u6a19\u984c
$ ps a | awk ‘NR!=1 {print $0}’ | head<\/span>
\u00a01237 tty1\u00a0\u00a0\u00a0\u00a0 Ss\u00a0\u00a0\u00a0\u00a0 0:00 \/bin\/login —<\/span>
\u00a01238 ttyS0\u00a0\u00a0\u00a0 Ss+\u00a0\u00a0\u00a0 0:06 \/sbin\/agetty –keep-baud 115200 38400 9600 ttyS0 vt220<\/span>
\u00a01294 tty1\u00a0\u00a0\u00a0\u00a0 S+\u00a0\u00a0\u00a0\u00a0 0:00 -bash<\/span>
14202 pts\/0\u00a0\u00a0\u00a0 Ss\u00a0\u00a0\u00a0\u00a0 0:00 -bash<\/span>
14264 pts\/0\u00a0\u00a0\u00a0 R+\u00a0\u00a0\u00a0\u00a0 0:00 ps a<\/span>
14265 pts\/0\u00a0\u00a0\u00a0 S+\u00a0\u00a0\u00a0\u00a0 0:00 awk NR!=1 {print $0}<\/span>
14266 pts\/0\u00a0\u00a0\u00a0 S+\u00a0\u00a0\u00a0\u00a0 0:00 head[@more@]<\/span>
\u5217\u51fa\u7b2c 2 \u884c\u5230\u7b2c 5 \u884c
$ ps a | awk ‘(NR>1 && NR<=5){print $0}’ | head<\/span>
\u00a01237 tty1\u00a0\u00a0\u00a0\u00a0 Ss\u00a0\u00a0\u00a0\u00a0 0:00 \/bin\/login —<\/span>
\u00a01238 ttyS0\u00a0\u00a0\u00a0 Ss+\u00a0\u00a0\u00a0 0:06 \/sbin\/agetty –keep-baud 115200 38400 9600 ttyS0 vt220<\/span>
\u00a01294 tty1\u00a0\u00a0\u00a0\u00a0 S+\u00a0\u00a0\u00a0\u00a0 0:00 -bash<\/span>
14202 pts\/0\u00a0\u00a0\u00a0 Ss\u00a0\u00a0\u00a0\u00a0 0:00 -bash<\/span><\/p>\n

\u5217\u51fa\u67d0\u4e00\u4f7f\u7528\u8005\u7684 UID
$\u00a0awk -F “:” ‘\/docker\/ {print $3}’ \/etc\/passwd<\/span>
996<\/span><\/p>\n

\u5340\u5206\u5927\u5c0f\u5beb
$ awk -F”:” ‘BEGIN{IGNORECASE=1}{if($1==”core”){print $3}}’ \/etc\/passwd<\/span>
500<\/span><\/p>\n

\u8a08\u7b97\u884c\u6578
$ awk ‘END{print NR}’ \/etc\/profile<\/span>
59<\/span>
\u00a0$ wc -l \/etc\/profile<\/span>
59 \/etc\/profile<\/span>
$ sed -n ‘$=’ \/etc\/profile<\/span>
59<\/span>
\u00a0$ grep -c “” \/etc\/profile<\/span>
59<\/span><\/p>\n

\u8a08\u7b97\u7a7a\u767d\u884c\u6578
# cat blankline.awk<\/span>
#!\/usr\/bin\/awk<\/span>
\/^$\/ {<\/span>
\u00a0 x += 1<\/span>
}<\/span>
END {<\/span>
\u00a0\u00a0\u00a0\u00a0 print x;<\/span>
}<\/span><\/p>\n

# awk -f blankline.awk \/etc\/profile<\/span>
11<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

\u5217\u51fa UID > 499 \u7684\u5e33\u865f\u53ca UID $ awk ‘BEGIN {FS=” … <\/p>\n

\u95b1\u8b80\u5168\u6587\u3008awk \u5099\u5fd8\u3009<\/span><\/a><\/p>\n","protected":false},"author":55,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[109],"tags":[],"class_list":["post-19530","post","type-post","status-publish","format-standard","hentry","category-c-72384"],"meta_key":{"_pingme":["1"],"_encloseme":["1"],"lt_post_id":["692862"]},"_links":{"self":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/19530"}],"collection":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/users\/55"}],"replies":[{"embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/comments?post=19530"}],"version-history":[{"count":0,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/19530\/revisions"}],"wp:attachment":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/media?parent=19530"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/categories?post=19530"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/tags?post=19530"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}