Searching & Replacing in vi

One of vi"s better features (và advantages over pico) is that it allows you khổng lồ search & replace throughout entire files. As shown in the next sections, you can just find a specific string of text (a regular expression, in Unix lingo; see Figure 4.14), or you can find the text và replace it with other text, as in Figure 4.15.

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Figure 4.14 Searching for text in vi is quichồng and reliable.


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Figure 4.15 Replacing text in vi requires a bit of arcane syntax, but you get used khổng lồ it quickly.


To find a string of text in vi:

vi hairyspider

For starters, access vi và a specific file.

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/spider

Enter comm& mode, then type / followed by the text you"re looking for. Here, we"re looking for "spider," but you may be looking for "the fly" or "wiggled & jiggled & tickled inside her." Or whatever.

Press to find the first occurrence of the term. Type n to find the next one.

To tìm kiếm & replace in vi:

vi hairyspider

For starters, access vi & a specific tệp tin.


TIPs

A great use for the search-and-replace feature is if you kết thúc up with DOS text files in your Unix tài khoản (by uploading a text file from a Windows machine as a binary file, most likely). If you view DOS files through a Unix shell, all the lines in the tệp tin will kết thúc with ^M. But if you try to type ^M when you"re doing a tìm kiếm & replace, the ^M won"t show up. What to do? Press , then . Just search and replace with :%s/
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//g. The commvà "escapes" the following character, so you can press it without actually doing what the commvà would otherwise bởi vì. If you don"t escape the , vi thinks you just pressed and tries lớn exexinh đẹp the unfinished command. See the section on grep in Chapter 6 for information about searching with regular expressions. Add a g at the kết thúc of the command to make it apply to all occurrences in the file. Otherwise, it applies only to lớn the first occurrence on each line.
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