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1. Mac Create New File

To quickly find any text string within any text file, try this from a terminal window: grep -l [text to find] [files to look in]For example, grep -l 123abc *.html will list the name of any file in the current directory that ends in.html and contains the string 123abc. (That's a lower-case-L following the GREP) Quite powerful, and fairly fast. Now, if you have some spare time, and want to see what it can really do, try this: su root cd / grep -lr 'text to find' *This will tell the OS to find the 'text to find' in every file in every directory, all the way down through the tree. The -r flag tells grep to recursively search directories.

Of course, OS X has something like 26,000 files, so this can take a very long time! If the weird name throws you, 'grep' is an acronym for 'general regular expression program'. If that doesn't help, it's probably because you're wondering what a regular expression ('re' or 'regex') is. Basically, it's a pattern used to describe a string of characters, and if you want to know aaaaaaall about them, I highly recommend reading by and published by Unix 端ber-publisher.

Regexes (regices, regexen.the pluralization is a matter of debate) are an extremely useful tool for any kind of text processing. Searching for patterns with grep is most people's first exposure to them, as like the article says, you can use them to search for a literal pattern within any number of text files on your computer.

The cool thing is that it doesn't have to be a literal pattern, but can be as complex as you'd like. The key to this is understanding that certain characters are 'metacharacters', which have special meaning for the regex-using program.

For example, a plus character (+) tells the program to match one or more instances of whatever immediately precedes it, while parentheses serve to treat whatever is contained as a unit. Thus, 'ha+' matches 'ha', but it also matches 'haa' and 'haaaaaaaaaaa', but not 'hahaha'. If you want to match the word 'ha', you can use '(ha)+' to match one or more instances of it, such as 'hahaha' and 'hahahahahahahahaha'.

Using a vertical bar allows alternate matching, so '(ha ho)+' matches 'hohoho', 'hahaha', and 'hahohahohohohaha'. There are many of these metacharacters to keep in mind. Inside brackets ([]), a carat (^) means that you don't want to match whatever follows inside the brackets. For Magritte fans, '[^(a cigar)]' matches any text that is not 'a cigar'. How to create network drive for both mac and pc. The rest of the time, the carat tells the program to match only at the beginning of a line, while a dollar sign ($) matches only at the end.

Mac Create New File

Therefore, '^everything$' matches the word 'everything' only when it is on a line all by itself and '^[^(anything else)]' matches all lines that do not begin with 'anything else'. The period (.) matches any character at all, and the asterisk (*) matches zero or more times. Compare this to the plus, which matches one or more times -- a subtle but important difference. A lot of regular expressions look for '.*', which is zero or more of anything (that is, anything at all).