{"id":687,"date":"2013-10-19T23:24:25","date_gmt":"2013-10-20T04:24:25","guid":{"rendered":"http:\/\/www.triatlantico.org\/blog\/?p=687"},"modified":"2021-11-20T18:22:40","modified_gmt":"2021-11-20T23:22:40","slug":"update-to-a-useful-bash-functionactualizacao-a-uma-funcao-util-em-bash","status":"publish","type":"post","link":"https:\/\/www.triatlantico.org\/blog\/2013\/10\/19\/update-to-a-useful-bash-functionactualizacao-a-uma-funcao-util-em-bash","title":{"rendered":"Update to a useful bash function|Actualiza\u00e7\u00e3o a uma fun\u00e7\u00e3o util em bash"},"content":{"rendered":"

[lang_en]Previously… Useful bash functions<\/a><\/p>\n

This new version is a tad more efficient since there are no more echo and pipes involved on the processing. Just one eval and one awk script.
\n[\/lang_en][lang_pt]Previamente… Fun\u00e7\u00f5es \u00fateis em bash<\/a><\/p>\n

Esta nova vers\u00e3o \u00e9 ligeiramente mais eficiente, porque n\u00e3o existem mais comandos echo e pipes envolvidos no processamento. Apenas um eval e um script awk.
\n[\/lang_pt]
\n<\/a><\/p>\n

\n\n
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unique_path(<\/span>)<\/span> {<\/span>
\n  eval<\/span> $(<\/span>awk<\/span> -v<\/span> VAR<\/span>="${1}<\/span>"<\/span> 'BEGIN {                 \\
\n    if((N=split(ENVIRON[VAR],vals,":"))<2) exit(0); \\
\n    sep = out="" ; i=split(out,seen);               \\
\n    do { if(!(vals[++i] in seen)) { seen[vals[i]];  \\
\n           gsub("["]","\\\\"",vals[i]);             \\
\n           out=sprintf("%s%s%s",out,sep,vals[i]);   \\
\n           sep=":";                                 \\
\n    } } while (i<N);                                \\
\n    printf "%s="%s"; export %s;\\n",VAR,out,VAR;   \\
\n  }'<\/span> \/<\/span>dev\/<\/span>null)<\/span>
\n}<\/span><\/div><\/td><\/tr><\/tbody><\/table><\/div>\n\n<\/pre>\n
[lang_en]Similarly, these also had remove unnecessary uses of sub-shell echo…[\/lang_en][lang_pt]Estas fun\u00e7\u00f5es tamb\u00e9m foram melhoradas removendo usos desnecess\u00e1rios de sub-shells para echo[\/lang_pt]<\/p>\n
\n\n
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safe_prepend_path(<\/span>)<\/span> {<\/span>
\n  VAR<\/span>=$1<\/span> ; shift<\/span> ; eval<\/span> VAL<\/span>=\\$${VAR}<\/span>
\n  for<\/span> i_;do<\/span> [<\/span> -d<\/span> "$i_<\/span>"<\/span> ]<\/span> &&<\/span> VAL<\/span>=$i_<\/span>${VAL:+":$VAL"}<\/span> ;done<\/span>
\n  eval<\/span> export<\/span> ${VAR}<\/span>=${VAL}<\/span>
\n}<\/span>
\n
\nsafe_append_path(<\/span>)<\/span> {<\/span>
\n  VAR<\/span>=$1<\/span> ; shift<\/span> ; eval<\/span> VAL<\/span>=\\$${VAR}<\/span>
\n  for<\/span> i_;do<\/span> [<\/span> -d<\/span> "$i_<\/span>"<\/span> ]<\/span> &&<\/span> VAL<\/span>=${VAL:+"$VAL:"}<\/span>$i_<\/span> ;done<\/span>
\n  eval<\/span> export<\/span> ${VAR}<\/span>=${VAL}<\/span>
\n}<\/span><\/div><\/td><\/tr><\/tbody><\/table><\/div>\n\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
[lang_en]Previously… Useful bash functions This new version is a tad more efficient since there are no more echo and pipes involved on the processing. Just one eval and one awk script. [\/lang_en][lang_pt]Previamente… Fun\u00e7\u00f5es \u00fateis em bash Esta nova vers\u00e3o \u00e9 ligeiramente mais eficiente, porque n\u00e3o existem mais comandos echo e pipes envolvidos no processamento. Apenas […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,62],"tags":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pmzAM-b5","_links":{"self":[{"href":"https:\/\/www.triatlantico.org\/blog\/wp-json\/wp\/v2\/posts\/687"}],"collection":[{"href":"https:\/\/www.triatlantico.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.triatlantico.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.triatlantico.org\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.triatlantico.org\/blog\/wp-json\/wp\/v2\/comments?post=687"}],"version-history":[{"count":15,"href":"https:\/\/www.triatlantico.org\/blog\/wp-json\/wp\/v2\/posts\/687\/revisions"}],"predecessor-version":[{"id":699,"href":"https:\/\/www.triatlantico.org\/blog\/wp-json\/wp\/v2\/posts\/687\/revisions\/699"}],"wp:attachment":[{"href":"https:\/\/www.triatlantico.org\/blog\/wp-json\/wp\/v2\/media?parent=687"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.triatlantico.org\/blog\/wp-json\/wp\/v2\/categories?post=687"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.triatlantico.org\/blog\/wp-json\/wp\/v2\/tags?post=687"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}