{"id":22897,"date":"2022-06-14T14:14:29","date_gmt":"2022-06-14T12:14:29","guid":{"rendered":"https:\/\/www.websupport.sk\/podpora\/?post_type=ht_kb&#038;p=22897"},"modified":"2022-06-14T14:33:13","modified_gmt":"2022-06-14T12:33:13","slug":"gnu-coreutils-vypis-obsahu-suborov","status":"publish","type":"ht_kb","link":"https:\/\/www.websupport.sk\/podpora\/kb\/gnu-coreutils-vypis-obsahu-suborov\/","title":{"rendered":"GNU Coreutils &#8211; v\u00fdpis obsahu s\u00faborov"},"content":{"rendered":"\n<p>Rekurz\u00edvna skratka GNU (GNU&#8217;s Not Unix = GNU nie je Unix) ozna\u010duje projekt, ktor\u00fd v roku 1983 zalo\u017eil americk\u00fd program\u00e1tor Richard Matthew Stallman (RMS). Za cie\u013e si dal vytvorenie slobodn\u00e9ho opera\u010dn\u00e9ho syst\u00e9mu s otvoren\u00fdm zdrojov\u00fdm k\u00f3dom, ktor\u00fd by vych\u00e1dzal z filozofie uzavret\u00e9ho opera\u010dn\u00e9ho syst\u00e9mu Unix.<\/p>\n\n\n\n<p>Pribli\u017ene o 10 rokov bol skompletizovan\u00fd Unix-Like slobodn\u00fd opera\u010dn\u00fd syst\u00e9m pod n\u00e1zvom GNU\/Linux, ktor\u00fd sa postupne stal zlat\u00fdm \u0161tandardom vo svete serverov. V r\u00f4znych obmen\u00e1ch je nasadzovan\u00fd aj v nosite\u013enej elektronike, mobiloch, tabletoch, telev\u00edzoroch, notebookoch, stolov\u00fdch po\u010d\u00edta\u010doch, aut\u00e1ch, \u010di dokonca vo vesm\u00edre.<\/p>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon\">Tip:&nbsp;<strong>V\u0161etky pr\u00edkazy si jednoducho otestujte s&nbsp;<a href=\"https:\/\/www.websupport.sk\/virtual-server\">WebSupport VPS<\/a><\/strong>. Vysk\u00fa\u0161ajte pr\u00e9miov\u00fd virtu\u00e1lny server zdarma e\u0161te dnes.<\/p>\n\n\n\n<p>Z\u00e1kladn\u00e9 programy \u010dasti GNU tvoria desiatky mal\u00fdch aplik\u00e1ci\u00ed, ktor\u00e9 robia jeden jednoduch\u00fd \u00fakon (napr. vyp\u00ed\u0161u zoznam s\u00faborov alebo obsah s\u00faboru). Z\u00e1rove\u0148 s\u00fa schopn\u00e9 medzi sebou spolupracova\u0165, ke\u010f\u017ee v\u00fdstup jedn\u00e9ho programu m\u00f4\u017ee by\u0165 pou\u017eit\u00fd ako vstup in\u00e9ho (napr. ni\u017e\u0161ie vysvetlen\u00e9 <code>head -n 10 nazov_suboru.txt | nl -b a<\/code>).<\/p>\n\n\n\n<p>Postupne si predstav\u00edme z\u00e1kladn\u00e9 programy projektu GNU (bal\u00edk Coreutils). Budeme pracova\u0165 so s\u00fabormi a s be\u017en\u00fdmi nastaveniami opera\u010dn\u00e9ho syst\u00e9mu GNU\/Linux, ktor\u00e9 s\u00fa ulo\u017een\u00e9 v s\u00faboroch. Preto\u017ee v opera\u010dnom syst\u00e9me GNU\/Linux je v\u0161etko o s\u00faboroch.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"555\" height=\"555\" src=\"https:\/\/www.websupport.sk\/podpora\/app\/uploads\/sites\/2\/2022\/06\/gnu.png\" alt=\"\" class=\"wp-image-22900\" srcset=\"https:\/\/www.websupport.sk\/podpora\/app\/uploads\/sites\/2\/2022\/06\/gnu.png 555w, https:\/\/www.websupport.sk\/podpora\/app\/uploads\/sites\/2\/2022\/06\/gnu-300x300.png 300w, https:\/\/www.websupport.sk\/podpora\/app\/uploads\/sites\/2\/2022\/06\/gnu-150x150.png 150w, https:\/\/www.websupport.sk\/podpora\/app\/uploads\/sites\/2\/2022\/06\/gnu-50x50.png 50w, https:\/\/www.websupport.sk\/podpora\/app\/uploads\/sites\/2\/2022\/06\/gnu-60x60.png 60w, https:\/\/www.websupport.sk\/podpora\/app\/uploads\/sites\/2\/2022\/06\/gnu-100x100.png 100w\" sizes=\"auto, (max-width: 555px) 100vw, 555px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">cat<\/h2>\n\n\n\n<p>Jeden z najzn\u00e1mej\u0161\u00edch n\u00e1strojov bal\u00edka GNU Coreutils je <code>cat<\/code>. Ide o jednoduch\u00fd v\u00fdpis obsahu oby\u010dajn\u00e9ho textov\u00e9ho s\u00faboru:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>cat nazov_suboru.txt<\/code><\/pre>\n\n\n\n<p>Jednoduch\u00fd v\u00fdpis je mo\u017en\u00e9 roz\u0161\u00edri\u0165 v\u010faka nastaveniam. Napr\u00edklad v\u0161etky nepr\u00e1zdne riadky sa o\u010d\u00edsluj\u00fa takto:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>cat -b nazov_suboru.txt<\/code><\/pre>\n\n\n\n<p>Ak do \u010d\u00edslovania potrebujeme zahrn\u00fa\u0165 aj pr\u00e1zdne riadky, pou\u017eijeme in\u00fd prep\u00edna\u010d:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>cat -n nazov_suboru.txt<\/code><\/pre>\n\n\n\n<p>U\u017eito\u010dn\u00fd je tie\u017e prep\u00edna\u010d <code>-s<\/code>, v\u010faka ktor\u00e9mu viacero po sebe nasleduj\u00facich pr\u00e1zdnych riadkov zredukujeme na jeden pr\u00e1zdny riadok:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>cat -s nazov_suboru.txt<\/code><\/pre>\n\n\n\n<p>Niekedy m\u00f4\u017ee zase by\u0165 prospe\u0161n\u00e9 zobrazi\u0165 konce riadkov ako znak dol\u00e1ra ($):<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>cat -e nazov_suboru.txt<\/code><\/pre>\n\n\n\n<p>V\u0161etky vy\u0161\u0161ie spom\u00ednan\u00e9 prep\u00edna\u010de m\u00f4\u017eeme kombinova\u0165, aby sme pri v\u00fdpise s\u00faborov dosiahli po\u017eadovan\u00fd efekt.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">tac<\/h2>\n\n\n\n<p>N\u00e1zov n\u00e1stroja <code>tac<\/code> je opa\u010dne nap\u00edsan\u00fd n\u00e1zov vy\u0161\u0161ie spom\u00ednan\u00e9ho n\u00e1stroja <code>cat<\/code>. N\u00e1stroj tac teda vyp\u00ed\u0161e obsah s\u00faboru, ale opa\u010dne. To znamen\u00e1, \u017ee posledn\u00fd riadok bude prv\u00fd, \u010do sa hod\u00ed napr\u00edklad pri s\u00faboroch z\u00e1znamov (log):<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>tac nazov_suboru.txt<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">nl<\/h2>\n\n\n\n<p>V pr\u00edpade, \u017ee potrebujeme \u010d\u00edslovanie riadkov nastavi\u0165 podrobnej\u0161ie, pou\u017eijeme n\u00e1stroj <code>nl<\/code>. V\u010faka nemu je mo\u017en\u00e9 prida\u0165 pred \u010d\u00edsla nuly (prv\u00fd riadok) alebo prida\u0165 medzi \u010d\u00edslo a za\u010diatok riadku \u013eubovo\u013en\u00e9 znaky (druh\u00fd riadok):<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>nl -n rz nazov_suboru.txt<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>nl -s ... nazov_suboru.txt<\/code><\/pre>\n\n\n\n<p>Tie\u017e m\u00f4\u017eeme upravi\u0165, do ktor\u00e9ho \u010d\u00edsla sa za\u010dne \u010d\u00edslovanie (prv\u00fd riadok), \u010di o ko\u013eko sa zv\u00e4\u010d\u0161\u00ed \u010fal\u0161ie \u010d\u00edslo (druh\u00fd riadok):<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>nl -v 2 nazov_suboru.txt<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>nl -i 2 nazov_suboru.txt<\/code><\/pre>\n\n\n\n<p>Podobne ako n\u00e1stroj cat, aj nl umo\u017e\u0148uje \u010d\u00edslova\u0165 v\u0161etky riadky (prv\u00fd riadok) alebo iba nepr\u00e1zdne riadky (druh\u00fd riadok):<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>nl -b a nazov_suboru.txt<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>nl -b t nazov_suboru.txt<\/code><\/pre>\n\n\n\n<p>Ak je riadkov v s\u00fabore pr\u00edli\u0161 ve\u013ea, sta\u010d\u00ed zv\u00fd\u0161i\u0165 prednastaven\u00fdch 6 \u010d\u00edslic na povedzme 10 (alebo \u013eubovo\u013en\u00fd po\u010det znakov):<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>nl -w 10 nazov_suboru.txt<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">od, base32 a base64<\/h2>\n\n\n\n<p>Obsah s\u00faboru n\u00e1stroj <code>od<\/code> zobraz\u00ed v osmi\u010dkovej (prv\u00fd riadok), desiatkovej (druh\u00fd riadok) alebo \u0161estn\u00e1ckovej (tret\u00ed riadok) s\u00fastave:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>od -A o nazov_suboru.txt<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>od -A d nazov_suboru.txt<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>od -A x nazov_suboru.txt<\/code><\/pre>\n\n\n\n<p>N\u00e1stroje <code>base32<\/code> a <code>base64<\/code> proste k\u00f3duj\u00fa obsah s\u00faboru v t\u00fdchto form\u00e1toch:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>base32 nazov_suboru.txt<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>base64 nazov_suboru.txt<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">head a tail<\/h2>\n\n\n\n<p>Priamo\u010diary pr\u00edkaz <code>head<\/code> sl\u00fa\u017ei na zobrazenie prv\u00fdch riadkov. Takto napr\u00edklad zobraz\u00edme prv\u00fdch 10 riadkov:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>head -n 10 nazov_suboru.txt<\/code><\/pre>\n\n\n\n<p>N\u00e1stroj head nedok\u00e1\u017ee \u010d\u00edslova\u0165 riadky, no s pomocou n\u00e1stroja nl \u010d\u00edslovanie \u013eahko prid\u00e1me. Cez potrubie (pipe) po\u0161leme v\u00fdstup z head do vstupu nl. Takto teda programy z bal\u00edka Coreutils dok\u00e1\u017eu spolupracova\u0165:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>head -n 10 nazov_suboru.txt | nl -b a<\/code><\/pre>\n\n\n\n<p>Naopak, <em>posledn\u00fdch<\/em> 10 riadkov zobraz\u00edme n\u00e1strojom <code>tail<\/code> takto:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>tail -n 10 nazov_suboru.txt<\/code><\/pre>\n\n\n\n<p>Program tail sa \u010dasto pou\u017e\u00edva na nepretr\u017eit\u00e9 sledovanie s\u00faborov so z\u00e1znamom (log). Preto\u017ee do t\u00fdchto s\u00faborov prib\u00fada obsah na koniec s\u00faboru pravidelne a r\u00fdchlo, je dobr\u00e9 sledova\u0165 aktu\u00e1lny stav automaticky:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>tail -n 10 -f nazov_suboru.txt<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">split<\/h2>\n\n\n\n<p>N\u00e1stroj <code>split<\/code> dok\u00e1\u017ee rozdeli\u0165 s\u00fabor na viacero men\u0161\u00edch s\u00faborov. Povedzme, \u017ee s\u00fabor obsahuje tis\u00edce dlh\u00fdch riadkov a jeho ve\u013ekos\u0165 znemo\u017e\u0148uje posla\u0165 ho e-mailom ako pr\u00edlohu. S\u00fabor teda rozdel\u00edme na viac mal\u00fdch, z ktor\u00fdch ka\u017ed\u00fd bude obsahova\u0165 najviac 1000 riadkov:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>split -l 1000 nazov_suboru.txt<\/code><\/pre>\n\n\n\n<p>Bolo vytvoren\u00fdch mno\u017estvo s\u00faborov, pri\u010dom ka\u017ed\u00fd za\u010d\u00edna mal\u00fdm p\u00edsmenom x. \u010ealej v n\u00e1zve nasleduj\u00fa ostatn\u00e9 p\u00edsmen\u00e1 pod\u013ea abecedy, aby bolo mo\u017en\u00e9 s\u00fabory usporiada\u0165 tak, ako ide obsah ve\u013ek\u00e9ho s\u00faboru.<\/p>\n\n\n\n<p>U\u017eito\u010dn\u00e9 m\u00f4\u017ee by\u0165 aj prida\u0165 koncovku s\u00faborov za n\u00e1zov ka\u017ed\u00e9ho s\u00faboru:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>split -l 1000 --additional-suffix=.txt nazov_suboru.txt<\/code><\/pre>\n\n\n\n<p>Takto m\u00f4\u017eeme men\u0161ie s\u00fabory prilo\u017ei\u0165 do pr\u00edlohy e-mailu, preto\u017ee u\u017e neprekra\u010duj\u00fa limit maxim\u00e1lnej ve\u013ekosti jedn\u00e9ho s\u00faboru.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Zhrnutie<\/h2>\n\n\n\n<p>V tejto \u010dasti seri\u00e1lu o GNU Coreutils sme predstavili n\u00e1stroje, v\u010faka ktor\u00fdm m\u00f4\u017eeme zobrazi\u0165 obsah textov\u00e9ho s\u00faboru. Uk\u00e1zali sme si nasadenie jednoduch\u00fdch n\u00e1strojov, a tie\u017e sme demon\u0161trovali mo\u017en\u00fa spolupr\u00e1cu medzi nimi.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Rekurz\u00edvna skratka GNU (GNU&#8217;s Not Unix = GNU nie je Unix) ozna\u010duje projekt, ktor\u00fd v roku 1983 zalo\u017eil americk\u00fd program\u00e1tor Richard Matthew Stallman (RMS). Za cie\u013e si dal vytvorenie slobodn\u00e9ho opera\u010dn\u00e9ho syst\u00e9mu s otvoren\u00fdm zdrojov\u00fdm k\u00f3dom, ktor\u00fd by vych\u00e1dzal z filozofie uzavret\u00e9ho opera\u010dn\u00e9ho syst\u00e9mu Unix. Pribli\u017ene o 10 rokov bol&#8230;<\/p>\n","protected":false},"author":28,"template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[435],"ht-kb-tag":[336,330,339,381,92,198,189],"class_list":["post-22897","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-nastroje","ht_kb_tag-cli","ht_kb_tag-linux","ht_kb_tag-open-source","ht_kb_tag-server","ht_kb_tag-shell","ht_kb_tag-ubuntu","ht_kb_tag-vps"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>GNU Coreutils - v\u00fdpis obsahu s\u00faborov - Websupport centrum podpory<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.websupport.sk\/podpora\/kb\/gnu-coreutils-vypis-obsahu-suborov\/\" \/>\n<meta property=\"og:locale\" content=\"sk_SK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"GNU Coreutils - v\u00fdpis obsahu s\u00faborov - Websupport centrum podpory\" \/>\n<meta property=\"og:description\" content=\"Rekurz\u00edvna skratka GNU (GNU&#8217;s Not Unix = GNU nie je Unix) ozna\u010duje projekt, ktor\u00fd v roku 1983 zalo\u017eil americk\u00fd program\u00e1tor Richard Matthew Stallman (RMS). Za cie\u013e si dal vytvorenie slobodn\u00e9ho opera\u010dn\u00e9ho syst\u00e9mu s otvoren\u00fdm zdrojov\u00fdm k\u00f3dom, ktor\u00fd by vych\u00e1dzal z filozofie uzavret\u00e9ho opera\u010dn\u00e9ho syst\u00e9mu Unix. 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