Writing a Unix Shell - Part I
One of the projects that I am exploring at RC, is writing a UNIX shell. This is the first part of a series of posts that will eventually follow. Disclaimer: I am not a subject expert on writing shells and I am sharing my findings as I learn more about this myself. What is a shell? A lot has been written about this, so I will not go into too much detail about the definition. However, in one line -
shã¨bashã§ã®å¤‰æ•°å†…ã®æ–‡å—列置æ›ãªã© - ã‚ã°é›»åãŒè©°ã¾ã¤ã¦ã‚ã‚‹
シェルスクリプトã§æ–‡å—列を置æ›ã—ãŸã„éš›ã€sedを使ã†æ‰‹æ³•ãŒç´¹ä»‹ã•ã‚Œã‚‹ã“ã¨ãŒå¤šã„。ãŒã€å®Ÿã¯sedãªã©ã®å¤–部コマンドを使ã‚ãªãã¦ã‚‚ã€ä»¥ä¸‹ã®ã‚ˆã†ã«å¤‰æ•°å±•é–‹ã‚’ã™ã‚‹ã“ã¨ã§ã‚·ã‚§ãƒ«å†…部ã§æ–‡å—列置æ›ã‚’ã™ã‚‹ã“ã¨ãŒã§ãる。 ${変数å#パターン} → å‰æ–¹ä¸€è‡´ã§ã®ãƒžãƒƒãƒéƒ¨åˆ†å‰Šé™¤(最çŸãƒžãƒƒãƒ) ${変数å##パターン} → å‰æ–¹ä¸€è‡´ã§ã®ãƒžãƒƒãƒéƒ¨åˆ†å‰Šé™¤(最長マッãƒ) ${変数å%パターン} → 後方一致ã§ã®ãƒžãƒƒãƒéƒ¨åˆ†å‰Šé™¤(最çŸãƒžãƒƒãƒ) ${変数å%%パターン} → 後方一致ã§ã®ãƒžãƒƒãƒéƒ¨åˆ†å‰Šé™¤(最長マッãƒ) ${変数å/ç½®æ›å‰æ–‡å—列/ç½®æ›å¾Œæ–‡å—列} → æ–‡å—列置æ›(最åˆã«ãƒžãƒƒãƒã—ãŸã‚‚ã®ã®ã¿) ${変数å//ç½®æ›å‰æ–‡å—列/ç½®æ›å¾Œæ–‡å—列} → æ–‡å—列置æ›(マッãƒã—ãŸã‚‚ã®ã™ã¹ã¦)ã“ã®æ©Ÿèƒ½ã¯è¨˜å·ã§æ›¸ã‹ã‚Œã‚‹ãŸã‚éžå¸¸ã«ã‚°ã‚°ã‚Šã«ãã„ã“ã¨ã¨ã€ç´ ã®shã§ã§ãã‚‹ã“ã¨ãƒ»bashã§ã—ã‹ã§ããªã„ã“ã¨ãŒæ··åœ¨ã—ã¦æ›¸ã‹ã‚ŒãŸè¨˜è¿°ã‚‚多ã„ãŸã‚ã€ã‚ã¾ã‚Šãƒ
suã¨sudoã®é•ã„ - Qiita
suã¨sudoã¯ã‚ªãƒ—ションã®é•ã„ã¯ã‚ã‚‹ã‚‚ã®ã®ã€ã§ãã‚‹ã“ã¨ã¯ã»ã¼é‡è¤‡ã—ã¦ã„る。 ãŸã ã€suã¯åˆ‡æ›¿å…ˆãƒ¦ãƒ¼ã‚¶ãƒ¼ï¼ˆroot）ã®ãƒ‘スワードãŒè¦æ±‚ã•ã‚Œã‚‹ã®ã«å¯¾ã—ã€sudoã¯å…ƒã®ãƒ¦ãƒ¼ã‚¶ãƒ¼ã®ãƒ‘スワードãŒè¦æ±‚ã•ã‚Œã‚‹ã€‚sudoã¯/etc/sudoersã§æ¨©é™ã‚’ç´°ã‹ãè¨å®šã§ãã‚‹ã®ã§ã€ã©ã¡ã‚‰ã‹ç‰‡æ–¹ã ã‘覚ãˆã‚‹ãªã‚‰sudoã ã‘を覚ãˆã¦ãŠãã¨ã‚ˆã„。 オプションã«ã‚ˆã£ã¦å®Ÿè¡Œå¾Œã®ã‚«ãƒ¬ãƒ³ãƒˆãƒ‡ã‚£ãƒ¬ã‚¯ãƒˆãƒªã‚„環境変数ãŒå¤‰ã‚ã£ã¦ãã¦ã€ãã‚Œã§ãƒãƒžã‚‹ã“ã¨ãŒã‚ã‚‹ã®ã§é•ã„ã‚’ã¾ã¨ã‚ã¦ãŠã。 （Amazon Linuxã§ç¢ºèªã€‚CentOSã§ã‚‚ã»ã¼åŒã˜ã¨æ€ã†ãŒã€ä»–ã®ãƒ‡ã‚£ã‚¹ãƒˆãƒªãƒ“ューションã§ã¯é•ã†å¯èƒ½æ€§ã‚り） コマンド .bash_profile .bashrc pwd HOME PATH
最近覚ãˆãŸã‚·ã‚§ãƒ«ã‚¹ã‚¯ãƒªãƒ—トã®å°ãƒã‚¿ - カメニッã‚
シェルスクリプト神ã‹ã‚‰æ•™ãˆã¦ã„ãŸã ã„ãŸã€‚忘れãªã„よã†ã«æ›¸ã„ã¨ã (追記)èžã„ã¦ã€è‡ªåˆ†ã®è¨˜æ†¶ã—ãŸå†…容をãã®ã¾ã¾æ›¸ã„ã¡ã‚ƒã£ãŸã®ã§ã€ã¡ã‚ƒã‚“ã¨ãƒžãƒ‹ãƒ¥ã‚¢ãƒ«é€šã‚Šã‹ç¢ºèªã—ã¦ãªã‹ã£ãŸã®ã§åçœ $ man bash 目次 xargsã§functionã‚’å©ã 連想é…列もã©ã 変数間接å‚ç…§ ãªã‚“ã§ã‚‚ã‹ã‚“ã§ã‚‚awkã§æ•´å½¢ã—ãªã„ æ–‡å—列ã®æœ«å°¾ã‹ã‚‰æ•°ãˆã¦â—‹æ–‡å—目を△文å—å–り出㙠番外編:ã‚„ãŸã‚‰ if [ ]; then を使ã‚ãªã„ ※Markdownã§ç›®æ¬¡ã®æ›¸ãæ–¹ãŒã‚ã‹ã‚‰ã‚“ã‹ã£ãŸ xargsã§functionã‚’å©ã 下ã®ä¾‹ã 㨠find xxxx | xargs cp xxxx ã£ã¦ã‹ã‘ã°è‰¯ã•ãã†ã§ã‚¤ãƒžã‚¤ãƒã ã‘ã©ã€ã‚‚ã£ã¨è¤‡é›‘ãªå‡¦ç†ã‚„らã›ãŸã„ã¨ãã«ã€‚ å‰ã¯ã“ã†æ›¸ã„ã¦ãŸ #!/bin/bash for x in `find /var/www -name xxx` do cmd="cp -v /hoge/fuga/xxx
「今日ã‹ã‚‰ä½¿ã„切るã€ï¿½ãŸã‚ã® GNU Parallel�ã«ã‚ˆã‚‹ä¸¦åˆ—処ç†å…¥é–€
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ãã®ã‚·ã‚§ãƒ«ã‚¹ã‚¯ãƒªãƒ—トもã†ã¡ã‚‡ã£ã¨ã‚·ãƒ³ãƒ—ルã«æ›¸ã‘ãㆠTips集（Golf/シェル芸ã§ã¯ãªã„） - Qiita
Shell Script Advent Calendar 2015 4日目 ã®æŠ•ç¨¿ã§ã™ã€‚ 以å‰ã‹ã‚‰è‡ªåˆ†ç”¨ã«ãƒ¡ãƒ¢ã—ã¦ã„ãŸã‚‚ã®ã‚’æ–‡å—èµ·ã“ã—ã—ã¾ã—ãŸã€‚ ã¯ã˜ã‚㫠仕事ã§ã‚·ã‚§ãƒ«ã‚’使ã„始ã‚ã¦3å¹´ãらã„経ã¡ã¾ã—ãŸã€‚ 途ä¸ã€python ã‚„ ruby ã§ã‚¹ã‚¯ãƒªãƒ—ト作ã£ãŸã‚Šã€ã¡ã‚‡ã£ã¨ zsh ã«æµ®æ°—ã—ãŸã‚Šã—ã¾ã—ãŸãŒã€ãªã‚“ã ã‹ã‚“ã ã§ä»Šã‚‚ Bash を使ã†ã“ã¨ãŒå¤šã„ã§ã™ã€‚ ã“ã®3å¹´é–“ã€ã‚¹ãƒ¼ãƒ‘ーシェル芸人(@ebanã•ã‚“)ã«ã”æ•™æŽˆé ‚ã„ãŸã‚Šã€Golfã—ãŸã‚Šï¼ˆ@ebanã®å½±éŸ¿ï¼‰ã€ã‚·ã‚§ãƒ«èŠ¸å‹‰å¼·ä¼šã«å‚åŠ ã—ãŸã‚Šï¼ˆ@ebanã®å½±éŸ¿ï¼‰ã—ã¦ãã¾ã—ãŸã€‚ ãã‚“ãª3å¹´é–“ã®ã¾ã¨ã‚ã¨ã—ã¦ã€ã‚·ã‚§ãƒ«ã‚¹ã‚¯ãƒªãƒ—トåˆã‚ã¾ã—ã¦ã ã£ãŸ3å¹´å‰ã®ç§ã«å‘ã‘ãŸTips集を書ã„ã¦ã¿ã¾ã—ãŸã€‚ 趣旨 å„é …ç›®ã”ã¨ã«ã€ã¾ãšåˆå¿ƒè€…（éŽåŽ»ã®ç§ãŒã‚„ã£ã¦ãŸï¼‰ã‚ã‚‹ã‚る実装を例示ã—ã¦ã€ãã®æ¬¡ã«ã€ã‚ˆã‚Šè‰¯ã•ã’ãªå®Ÿè£…を例示ã™ã‚‹æ§‹æˆã¨ã—ã¦ã„ã¾ã™ã€‚ 実行環境 OS Mac OS X Yos
対話å¼ã®ã‚³ãƒžãƒ³ãƒ‰ã‚’スクリプト化ã™ã‚‹æ–¹æ³• - Qiita
# !/usr/bin useradd UserName expect -c " spawn passwd UserName expect \"New password:\" send -- \"hogehoge\n\" expect \"Retype new password:\" send -- \"hogehoge\n\" expect \"passwd: all authentication tokens updated successfully.\" send -- \"exit\n\" " ``` ã§ã€å®Ÿè¡Œ ``` $ chmod +x set_passwd.sh $ ./set_passwd.sh ``` ## 実装例2：CSVã®ãƒ‡ãƒ¼ã‚¿ã‚’å…ƒã«Linuxã«ãƒ¦ãƒ¼ã‚¶ãƒ¼ã‚’è¿½åŠ **仕様** 1. [ユーザーå]ã¨[パスワード]ã‚’CSVã«è¨˜å…¥ 2. csv内ã®å€¤ã‚’引数ã«ã€useradd
ShellCheck – shell script analysis tool
GPLv3: free as in freedom documented on the ShellCheck Wiki available on GitHub (as is this website) already packaged for your distro or package manager supported as an integrated linter in major editors available in CodeClimate, Codacy and CodeFactor to auto-check your GitHub repo written in Haskell, if you're into that sort of thing.
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Trải nghiệm trò chÆ¡i giải trà và sòng bạc đỉnh cao vá»›i YYLive.com Các buổi phát trá»±c tiếp hấp dẫn nhất và các trò chÆ¡i có tá»· lệ cược cao Ä‘ang chá» bạn! YYLive mang đến trải nghiệm phát trá»±c tiếp phong phú, nÆ¡i ngÆ°á»i xem có thể kết nối vá»›i thần tượng yêu thÃch của mình và thưởng thức nhiá»u ná»™i dung hấp dẫn. Ná»n tảng của chúng tôi có rất nhiá»u idol tà i năng và hấp dẫn, những ngÆ°á»i mang đến sá»± thu hút
使ã„ã‚„ã™ã„シェルスクリプトを書ã
ã§ãã‚Œã°ã‚·ã‚§ãƒ«ã‚¹ã‚¯ãƒªãƒ—トãªã‚“ã¦æ›¸ããŸããªã„ã‚“ã ã‘ã©ï¼Œã¾ã ã¾ã 書ã機会ã¯å¤šã„．シェル芸やワンライナーã®ã‚ˆã†ãªå‡ã£ãŸã“ã¨ã§ã¯ãªã，他ã®ã²ã¨ãŒä½¿ã„ã‚„ã™ã„シェルスクリプトを書ããŸã‚ã«è‡ªåˆ†ãŒå®Ÿè·µã—ã¦ã„ã‚‹ã“ã¨ã‚’ã¾ã¨ã‚ã¦ãŠã． ヘルプメッセージ 書ã„ã¦ã‚‹ã‚·ã‚§ãƒ«ã‚¹ã‚¯ãƒªãƒ—トãŒä½¿ã„æ¨ã¦ã§ã¯ãªã何度も使ã†ã‚‚ã®ã§ã‚ã‚‹å ´åˆã¯ï¼Œæœ¬ä½“を書ã始ã‚ã‚‹å‰ã«ï¼Œãã®ã‚¹ã‚¯ãƒªãƒ—トã®ä½¿ã„方を表示ã™ã‚‹usage関数を書ã„ã¦ã—ã¾ã†ï¼Ž ã“れを書ã„ã¦ãŠãã¨ï¼Œå¾Œã€…ãƒãƒ¼ãƒ ã¸å…±æœ‰ãŒã—ã‚„ã™ããªã‚‹ï¼Žã¨ã‚Šã‚ãˆãšusage見ã¦ãã ã•ã„ã¨è¨€ãˆã‚‹ï¼Žã¾ãŸï¼Œã‚らã‹ã˜ã‚書ãã“ã¨ã§ï¼Œå˜ãªã‚‹ã‚·ã‚§ãƒ«ã‚¹ã‚¯ãƒªãƒ—トã§ã‚ã£ã¦ã‚‚自分ã®ä¸ã§å‹•ä½œã‚’æ•´ç†ã—ã¦ã‹ã‚‰æ›¸ã始ã‚ã‚‹ã“ã¨ãŒã§ãる．関数ã¨ã—ã¦æ›¸ãã®ã¯ï¼Œusageを表示ã—ã¦ã‚ã’ã‚‹ã¨ã‚ˆã„å ´é¢ãŒã„ãã¤ã‹ã‚り，使ã„回ã™ã“ã¨ãŒã§ãã‚‹ãŸã‚． 以下ã®ã‚ˆã†ã«æ›¸ã． function usage { cat <<EOF $(basename ${0})
コンソールã‹ã‚‰åˆ‡ã‚ŒãŸãƒ—ãƒã‚»ã‚¹ã‚’標準出力ã«ã¤ãªã’ãªãŠã™ - 絶å“ゆã©ã†ãµã®ã‚¿ãƒ¬
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Linux標準教科書2.0.0ã‚’èªã‚“ã - rochefort's blog
自分ã«ã¯ã‚‚ã†å¿…è¦ãªã„ã‹ã‚‚ã¨æ€ã„ãªãŒã‚‰ç©èªçŠ¶æ…‹ã ã£ãŸ Linux標準教科書 ã‚’èªã¿ã¾ã—ãŸã€‚ 以外ã¨çŸ¥ã‚‰ãªã„ã“ã¨ã‚‚ã‚り勉強ã«ãªã‚Šã¾ã—ãŸã€‚ 基礎大事。 shellã®ãƒ‡ãƒãƒƒã‚°(sh -x) : 9.8 デãƒãƒƒã‚°(P.177) 新人ã®é ƒshellを書ãã¾ãã£ã¦ã€print debugã—ã¾ãã£ã¦ãŸè‡ªåˆ†ã«æ•™ãˆã¦ã‚ã’ãŸã„。 例ã¨ã—ã¦åˆ†ã‹ã‚Šã«ãã„ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“ãŒã€ -x ã‚’ã¤ã‘ã¦å®Ÿè¡Œã™ã‚‹ã¨ コマンドや変数ã®ä¸èº«ã‚’表示ã—ãªãŒã‚‰å®Ÿè¡Œã—ã¦ãã‚Œã¾ã™ã€‚ sampleã¨ã—ã¦ã¯è‹¥å¹²è¦‹ã«ãã„ã‹ã‚‚ã—ã‚Œãªã„ã§ã™ãŒ $ cat samle.sh while true do echo "Continue? (y/n)" read input case $input in n) break ;; y) continue ;; *) echo "Please input y or n." ;; esac done ã“れを -x　付ãã§
シェルスクリプトを書ãã¨ãã«æ°—ã‚’ã¤ã‘ã‚‹9ç®‡æ¡ - Qiita
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