{"id":2092,"date":"2015-04-26T12:15:38","date_gmt":"2015-04-26T04:15:38","guid":{"rendered":"http:\/\/ixyzero.com\/blog\/?p=2092"},"modified":"2015-04-26T12:15:38","modified_gmt":"2015-04-26T04:15:38","slug":"%e5%90%84%e7%a7%8dtips%e5%90%88%e8%be%91","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/2092.html","title":{"rendered":"\u5404\u79cdTips\u5408\u8f91"},"content":{"rendered":"<h5>Tips\u5408\u8f91<\/h5>\n<ul>\n<li><a href=\"http:\/\/search.aol.com\/aol\/search?s_it=topsearchbox.search&amp;s_chn=prt_aol20&amp;v_t=comsearch&amp;q=shell+tips+site%3Astackoverflow.com\">shell tips site:stackoverflow.com &#8211; AOL Search Results<\/a><\/li>\n<li><a href=\"http:\/\/search.aol.com\/aol\/search?enabled_terms=&amp;s_it=comsearch&amp;q=python+tips+site%3Astackoverflow.com&amp;s_chn=prt_aol20\">python tips site:stackoverflow.com &#8211; AOL Search Results<\/a><\/li>\n<li><a href=\"http:\/\/search.aol.com\/aol\/search?enabled_terms=&amp;s_it=comsearch&amp;q=awk+tips+site%3Astackoverflow.com&amp;s_chn=prt_aol20\">awk tips site:stackoverflow.com &#8211; AOL Search Results<\/a><\/li>\n<li><a href=\"http:\/\/search.aol.com\/aol\/search?s_it=topsearchbox.search&amp;s_chn=prt_aol20&amp;v_t=comsearch&amp;q=regex+tips+site%3Astackoverflow.com\">regex tips site:stackoverflow.com &#8211; AOL Search Results<\/a><\/li>\n<li><a href=\"http:\/\/stackoverflow.com\/questions\/11697556\/tipsntricks-in-awk\">idioms &#8211; tips&#8217;n&#8217;tricks in awk &#8211; Stack Overflow<\/a><\/li>\n<li><a href=\"http:\/\/superuser.com\/questions\/503784\/loading-local-shell-aliases-to-ssh-session-dynamicaly\">linux &#8211; loading local shell aliases to ssh session dynamicaly &#8211; Super User<\/a><\/li>\n<li><a href=\"http:\/\/stackoverflow.com\/questions\/2659777\/bash-tips-needed-for-understanding-how-to-escape-characters-in-command-line\">escaping &#8211; bash tips needed for understanding how to escape characters in command-line &#8211; Stack Overflow<\/a><\/li>\n<li><a href=\"http:\/\/serverfault.com\/questions\/68883\/linux-command-line-best-practices-and-tips\">bash &#8211; Linux command line best practices and tips? &#8211; Server Fault<\/a><\/li>\n<li><a href=\"http:\/\/stackoverflow.com\/questions\/1447217\/linux-bash-tips-for-developers\">shell &#8211; linux\/bash tips for developers? &#8211; Stack Overflow<\/a><\/li>\n<li><a href=\"http:\/\/stackoverflow.com\/questions\/68372\/what-is-your-single-most-favorite-command-line-trick-using-bash\">What is your single most favorite command-line trick using Bash? &#8211; Stack Overflow<\/a><\/li>\n<li><a href=\"http:\/\/stackoverflow.com\/questions\/3934423\/awk-conditional-sum-from-a-csv-file?rq=1\">Awk conditional sum from a CSV file &#8211; Stack Overflow<\/a><\/li>\n<li><a href=\"https:\/\/wiki.python.org\/moin\/PythonSpeed\/PerformanceTips#Profiling_Code\">PythonSpeed\/PerformanceTips &#8211; Python Wiki<\/a><\/li>\n<li><a href=\"http:\/\/ixyzero.com\/blog\/archives\/1011.html\">\u4e00\u4e9b\u9ed8\u8ba4\u7684\u7528\u6237\u540d\/\u5bc6\u7801 | ASPIRE<\/a><\/li>\n<li><a href=\"https:\/\/cirt.net\/passwords?criteria=Cisco\">Default Passwords | CIRT.net<\/a><\/li>\n<\/ul>\n<p>==<\/p>\n<ul>\n<li><a href=\"http:\/\/www.pement.org\/awk\/awk1line.txt\">http:\/\/www.pement.org\/awk\/awk1line.txt<\/a><\/li>\n<li><a href=\"http:\/\/bumble.sourceforge.net\/books\/awk\/awk-book.txt.x.html\">http:\/\/bumble.sourceforge.net\/books\/awk\/awk-book.txt.x.html<\/a><\/li>\n<li><a href=\"http:\/\/bumble.sourceforge.net\/books\/awk\/awk-book.txt\">http:\/\/bumble.sourceforge.net\/books\/awk\/awk-book.txt<\/a><\/li>\n<li><a href=\"http:\/\/wiki.bits.vib.be\/index.php\/Awk\">http:\/\/wiki.bits.vib.be\/index.php\/Awk<\/a><\/li>\n<\/ul>\n<p>==<\/p>\n<p>\u7528sed\/awk\u5bf9\u6587\u4ef6\u8fdb\u884c\u5904\u7406\u540e\uff0c\u5982\u679c\u9700\u8981\u4fdd\u5b58\u8fdb\u884c\u7684\u4fee\u6539\uff0c\u4e0d\u80fd\u76f4\u63a5\u91cd\u5b9a\u5411\uff0c\u5426\u5219\u6587\u4ef6\u4f1a\u88ab\u622a\u65ad\u4e3a\u7a7a\u3002<\/p>\n<ul>\n<li><a href=\"http:\/\/stackoverflow.com\/questions\/3886773\/using-sed-to-replace-the-contents-of-a-file-is-not-working-in-bash-script\" target=\"_blank\">http:\/\/stackoverflow.com\/questions\/3886773\/using-sed-to-replace-the-contents-of-a-file-is-not-working-in-bash-script<\/a><\/li>\n<li><a href=\"http:\/\/stackoverflow.com\/questions\/5171901\/sed-command-find-and-replace-in-file-and-overwrite-file-doesnt-work-it-empties\" target=\"_blank\">http:\/\/stackoverflow.com\/questions\/5171901\/sed-command-find-and-replace-in-file-and-overwrite-file-doesnt-work-it-empties<\/a><\/li>\n<\/ul>\n<p>Try this:<\/p>\n<pre class=\"lang:default decode:true\">sed -i -e 's\/&lt;em\\:update.*\/\/g' install.rdf<\/pre>\n<p><strong>When you redirect output to a file in truncate mode, <span style=\"color: #ff0000;\">the file is truncated first, before it&#8217;s read<\/span>.<\/strong>\u00a0Thus, the result is an empty file. Using\u00a0sed -i\u00a0avoids this.<\/p>\n<p>Portable (and hopefully not too insecure) solution:<\/p>\n<pre class=\"lang:default decode:true\">(set -C &amp;&amp; sed -e 's\/&lt;em\\:update.*\/\/g' install.rdf &gt; install.rdf.$$ &amp;&amp; mv install.rdf.$$ install.rdf)<\/pre>\n<p>\ud83d\ude42<\/p>\n<p>==<\/p>\n<h5>Awk\u7684\u4e8c\u7ef4\u6570\u7ec4<\/h5>\n<h6>\u641c\u7d22\u5173\u952e\u5b57\uff1a<\/h6>\n<p>awk two dimensional array<\/p>\n<h6>\u53c2\u8003\u94fe\u63a5\uff1a<\/h6>\n<ul>\n<li><a href=\"http:\/\/www.grymoire.com\/Unix\/Awk.html#uh-23\">http:\/\/www.grymoire.com\/Unix\/Awk.html#uh-23<\/a><\/li>\n<li><a href=\"http:\/\/stackoverflow.com\/questions\/3060600\/awk-array-iteration-for-multi-dimensional-arrays\">http:\/\/stackoverflow.com\/questions\/3060600\/awk-array-iteration-for-multi-dimensional-arrays<\/a><\/li>\n<li><a href=\"http:\/\/www.staff.science.uu.nl\/~oostr102\/docs\/nawk\/nawk_87.html\">http:\/\/www.staff.science.uu.nl\/~oostr102\/docs\/nawk\/nawk_87.html<\/a><\/li>\n<li><a href=\"https:\/\/www.gnu.org\/software\/gawk\/manual\/html_node\/Arrays-of-Arrays.html\">https:\/\/www.gnu.org\/software\/gawk\/manual\/html_node\/Arrays-of-Arrays.html<\/a><\/li>\n<\/ul>\n<p>==<\/p>\n<h5>Awk\u7684sub\u548cgsub\u51fd\u6570<\/h5>\n<h6>\u641c\u7d22\u5173\u952e\u5b57\uff1a<\/h6>\n<p>awk gsub<\/p>\n<h6>\u53c2\u8003\u94fe\u63a5\uff1a<\/h6>\n<ul>\n<li><a href=\"http:\/\/stackoverflow.com\/questions\/10371553\/awk-sub-and-gsub-function\">http:\/\/stackoverflow.com\/questions\/10371553\/awk-sub-and-gsub-function<\/a><\/li>\n<li><a href=\"http:\/\/www.delorie.com\/gnu\/docs\/gawk\/gawk_136.html\">http:\/\/www.delorie.com\/gnu\/docs\/gawk\/gawk_136.html<\/a><\/li>\n<li><a href=\"http:\/\/www.staff.science.uu.nl\/~oostr102\/docs\/nawk\/nawk_92.html\">http:\/\/www.staff.science.uu.nl\/~oostr102\/docs\/nawk\/nawk_92.html<\/a><\/li>\n<li><a href=\"http:\/\/blog.sina.com.cn\/s\/blog_67e34ceb0100ybvg.html\" target=\"_blank\">linux\u4e2dawk\u4e0bgsub\u51fd\u6570\u7528\u6cd5<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Tips\u5408\u8f91 shell tips site:stackoverflow.com &#8211; AOL Se [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,11,6],"tags":[74,78,19],"class_list":["post-2092","post","type-post","status-publish","format-standard","hentry","category-knowledgebase-2","category-linux","category-other","tag-awk","tag-sed","tag-tips"],"views":2354,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/2092","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=2092"}],"version-history":[{"count":0,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/2092\/revisions"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=2092"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=2092"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=2092"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}