インフラエンジニアの方なら、調査の時に下記のような感じでawk のprint文を使ってログファイルから必要なフィールドだけ取り出すことも多いと思う。 # awk '{print $1,$4,$5}' /var/log/httpd/access_log 46.161.9.4 [07/Feb/2016:03:55:32 +0900] 133.130.88.115 [07/Feb/2016:03:58:13 +0900] 142.54.169.164 [07/Feb/2016:04:06:17 +0900] 133.130.88.115 [07/Feb/2016:04:08:13 +0900] 133.130.88.115 [07/Feb/2016:04:18:14 +0900] 157.7.137.160 [07/Feb/2016:04:28:13 +0900] 133.130.88.115
![awkで末尾から数えてn番目のフィールドを取り出す。 - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/328a5d8c750c691c0dc208a41cd682bcacd91234/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-9f5428127621718a910c8b63951390ad.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTkxNiZoPTMzNiZ0eHQ9YXdrJUUzJTgxJUE3JUU2JTlDJUFCJUU1JUIwJUJFJUUzJTgxJThCJUUzJTgyJTg5JUU2JTk1JUIwJUUzJTgxJTg4JUUzJTgxJUE2biVFNyU5NSVBQSVFNyU5QiVBRSVFMyU4MSVBRSVFMyU4MyU5NSVFMyU4MiVBMyVFMyU4MyVCQyVFMyU4MyVBQiVFMyU4MyU4OSVFMyU4MiU5MiVFNSU4RiU5NiVFMyU4MiU4QSVFNSU4NyVCQSVFMyU4MSU5OSVFMyU4MCU4MiZ0eHQtY29sb3I9JTIzMjEyMTIxJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTU2JnR4dC1jbGlwPWVsbGlwc2lzJnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnM9OTZkOTU5MGJjOTU1M2E2NTdkYzhhYmZhMjk2NDhiMjg%26mark-x%3D142%26mark-y%3D112%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTYxNiZ0eHQ9JTQwc2FuZF9iYXNoJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9MzYmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz0yYzg3MjRkNzNiYTBhZmQxYjJmNDU1MjQ2MTI0MzIwNA%26blend-x%3D142%26blend-y%3D491%26blend-mode%3Dnormal%26s%3D0b45bc342bc02da18ae55f925201daf3)