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Full Discussion: Simple newbie grep question
Top Forums UNIX for Dummies Questions & Answers Simple newbie grep question Post 302182146 by doubleminus on Saturday 5th of April 2008 03:00:59 PM
Old 04-05-2008
Simple newbie grep question

How come grep [sd] testfile1 won't find anything in testfile1 (even though the characters sd are there in great quantity), but grep '[sd]' testfile1 will find plenty?

Do the single quotes prevent the shell from interpreting the [ test command? So when not using single quotes, the grep [sd] testfile1 is interpreted as: grep *test whether or not characters sd exist* testfile1?

Or is the explanation much simpler? Thanks!
 

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XZGREP(1)							     XZ Utils								 XZGREP(1)

NAME
xzgrep - search compressed files for a regular expression SYNOPSIS
xzgrep [grep_options] [-e] pattern file... xzegrep ... xzfgrep ... lzgrep ... lzegrep ... lzfgrep ... DESCRIPTION
xzgrep invokes grep(1) on files which may be either uncompressed or compressed with xz(1), lzma(1), gzip(1), or bzip2(1). All options specified are passed directly to grep(1). If no file is specified, then standard input is decompressed if necessary and fed to grep(1). When reading from standard input, gzip(1) and bzip2(1) compressed files are not supported. If xzgrep is invoked as xzegrep or xzfgrep then egrep(1) or fgrep(1) is used instead of grep(1). The same applies to names lzgrep, lze- grep, and lzfgrep, which are provided for backward compatibility with LZMA Utils. ENVIRONMENT
GREP If the GREP environment variable is set, xzgrep uses it instead of grep(1), egrep(1), or fgrep(1). SEE ALSO
grep(1), xz(1), gzip(1), bzip2(1), zgrep(1) Tukaani 2010-09-27 XZGREP(1)
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