跳转到内容
View in the app

A better way to browse. Learn more.

彼岸论坛

A full-screen app on your home screen with push notifications, badges and more.

To install this app on iOS and iPadOS
  1. Tap the Share icon in Safari
  2. Scroll the menu and tap Add to Home Screen.
  3. Tap Add in the top-right corner.
To install this app on Android
  1. Tap the 3-dot menu (⋮) in the top-right corner of the browser.
  2. Tap Add to Home screen or Install app.
  3. Confirm by tapping Install.
欢迎抵达彼岸 彼岸花开 此处谁在 -彼岸论坛

[问与答] 这个 sed 里,关于单引号双引号的用法,应该是去查阅 shell 的资料吗?

发表于
code=FF
sed -i 's/111/0x'"$code"'/' $file

比如上面这个代码,最终效果等于sed -i 's/111/0xFF/' $file

上面的过程是这样的吗?

  • 先对里面'"$code"'进行 shell 的解释。
  • 解释成sed -i 's/111/0xFF/' $file后,sed 命令才开始工作。

另外主要对 shell 脚本不太熟,上面这个命令在$code 外面用了单引号和双引号,想彻底搞清楚这些用法,有什么官方链接吗? (比如类似 https://www.gnu.org/software/sed/manual/sed.html )( PS:当然我也会先看看中文博客讲解,后面需要查询特定技巧时 可能再来看这种官方链接)

Featured Replies

No posts to show

创建帐户或登录来提出意见

Configure browser push notifications

Chrome (Android)
  1. Tap the lock icon next to the address bar.
  2. Tap Permissions → Notifications.
  3. Adjust your preference.
Chrome (Desktop)
  1. Click the padlock icon in the address bar.
  2. Select Site settings.
  3. Find Notifications and adjust your preference.