Terminal displays only the final results of the two commands combined. The first part of the command looks for the word Walden in any files in the current directory, and the second runs another grep command on the results of the first command. You’d use this command: grep Walden * | grep Pond. Say you want to find files containing both Walden and Pondon the same line. Why is the following simple grep command not working grep -Ei 'd+.d+' Nasa-1024-256. Using the pipe ( |), a Unix redirection operator, you can tell grep to search for more than one string. I have a file that has the line: Time 97.7518 seconds I want to get the decimal time. (Note that you can also combine options-for instance, grep -rl Walden searches subfolders and returns only a list of files containing the word Walden. Get started with the helpful options listed here. In some obscure cases it may be necessary to use the underlying operator names instead. The grep command has several options that let you fine-tune the way you search for text, as well as the kind of results grep returns. The key word ILIKE can be used instead of LIKE to make the match. Returns the names of files containing Walden and the number of hits in each file. In FreeBSD, you can install the devel/pcre port which includes pcregrep, which supports PCRE (and look-ahead/behind). Finds Walden in any file in any subfolder of ~/Documents.įinds only live does not find liver, lives, lived, and so on.įinds files containing Walden, but returns only a list of file names. Note that GNU greps -P option does not exist in the grep included in BSD, or the ones that come with any SVR4 (Solaris, etc).
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