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Full Discussion: Diff between grep .* file name and grep '.*' filename
Top Forums Shell Programming and Scripting Diff between grep .* file name and grep '.*' filename Post 302733079 by jim mcnamara on Monday 19th of November 2012 06:13:54 PM
Old 11-19-2012
The '*' is not expanded by the shell into filenames. *,? and other characters in the shell are metacharacters, they represent something "beyond" themselves as basic characters - in this case * is a wild card for filenames.

If this is homework post any followups in the homework forum. It has different rules.
 

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LEARN ABOUT PLAN9

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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