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This section will come in extremely handy if you’re familiar with RegEx.
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grep -F "words$word" file.txtįor a larger list from a file, you can use cat to print out the file as an argument to grep and reuse the same syntax. You can pass in a string shown below instead for a small number of matches, with a dollar sign indicating a newline. To use multiple phrases, separated by newlines, to capture relevant matches in a file or text stream from a program, you can use the -F/ -fixed-strings to specify them. You can use the same idea to match phrases if they appear as a single line, with -x/ -line-regexp. If you prefer that grep only print the phrases that match exactly (i.e., have spaces around them and are not substrings of other words), you can use the -w/ -word-regexp flag to enable whole word matching. We’ll continue to use the file as an example, but you can do this with any program that prints to stdout. You can also capture the output of a program and grep the output for a phrase, as shown.
#Find word in file linux how to#
How to extract email addresses from text file? cat grep word file.txtĪs you can see above, all words that contain the substring word are captured. Given a target word and a file, we can search for the word in the file as shown. The simplest way to use grep is to find the occurrences of a phrase in a file. This tutorial will extensively cover the use of grep from basic examples such as capturing a single phrase to capturing multiple patterns using RegEx or fixed strings, assuming a Bash command line. grep is available across all modern UNIX systems. The best tool for this job in Linux is grep written by Ken Thompson around 1973. Sometimes that information is unordered, which requires you to figure out a pattern to catch all relevant data. As a Bash scriptwriter, you may find yourself in a situation where you need to parse a wall of text for relevant information.