2019-03-31 11:00:21 +00:00
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---
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title: お仕事で覚えたシェルスクリプトの使い方
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2021-02-27 13:04:45 +00:00
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date: 2013-07-20T15:04:05Z
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2021-11-13 03:11:49 +00:00
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author: kazu634
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2022-08-21 08:25:55 +00:00
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images:
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- "ogp/2013-07-20-shell_scripting_know-how_001.webp"
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2019-03-31 11:00:21 +00:00
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categories:
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2021-11-17 13:56:35 +00:00
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- インフラ
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2021-02-27 12:05:32 +00:00
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tags:
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- ShellScript
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2019-03-31 11:00:21 +00:00
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---
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## sedコマンドでA行目からB行目を切り出す
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以下のように実行してあげるよ:
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`sed -n 'A,Bp' /path/to/file`
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実行例はこんな感じです:
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```
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2021-02-27 12:05:32 +00:00
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kazu634@macbook% cat -n /etc/hosts
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1 ##
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2 # Host Database
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3 #
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4 # localhost is used to configure the loopback interface
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5 # when the system is booting. Do not change this entry.
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6 ##
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7 127.0.0.1 localhost
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8 255.255.255.255 broadcasthost
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9 ::1 localhost
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10 fe80::1%lo0 localhost
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11
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12 59.106.177.26 sakura-vps
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13 133.242.151.82 sakura-vps2
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14
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15 192.168.3.4 esxi
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16 192.168.3.5 freenas
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17 192.168.3.100 vyatta
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kazu634@macbook% sed -n '1,8p' /etc/hosts
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##
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# Host Database
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#
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# localhost is used to configure the loopback interface
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# when the system is booting. Do not change this entry.
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##
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127.0.0.1 localhost
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2019-03-31 11:00:21 +00:00
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255.255.255.255 broadcasthost
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```
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## sedコマンドでA行目から最終行までを切り出す
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以下のように実行してあげるよ:
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`sed -n 'A,$p' /path/to/file`
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実行例はこんな感じです:
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```
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2021-02-27 12:05:32 +00:00
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kazu634@macbook% sed -n '7,$p' /etc/hosts
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127.0.0.1 localhost
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255.255.255.255 broadcasthost
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::1 localhost
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fe80::1%lo0 localhost
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59.106.177.26 sakura-vps
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133.242.151.82 sakura-vps2
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192.168.3.4 esxi
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192.168.3.5 freenas
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2019-03-31 11:00:21 +00:00
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192.168.3.100 vyatta
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```
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## 空ファイルの削除
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以下のように実行してあげるよ:
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`find /path/to/root-dir -type f -empty | xargs rm`
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## 空ディレクトリの削除
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以下のように実行してあげるよ:
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`find /path/to/root-dir -type d | xargs rmdir`
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もしかすると`sort`を間に挟めるともっといいのかも。
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## grepコマンドでPerl互換の正規表現をつかう
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-P オプションを指定する！
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## grepコマンドでパターンにマッチするファイル名のみを表示する
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-l オプションを指定する！
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## sedで空行を削除
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`sed '/^$/d' /path/to/file`
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実行例はこんな感じです:
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```
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2021-02-27 12:05:32 +00:00
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kazu634@macbook% sed '/^$/d' /etc/hosts
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##
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# Host Database
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#
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# localhost is used to configure the loopback interface
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# when the system is booting. Do not change this entry.
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##
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127.0.0.1 localhost
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255.255.255.255 broadcasthost
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::1 localhost
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fe80::1%lo0 localhost
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59.106.177.26 sakura-vps
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133.242.151.82 sakura-vps2
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192.168.3.4 esxi
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192.168.3.5 freenas
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2019-03-31 11:00:21 +00:00
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192.168.3.100 vyatta
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```
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