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Top Forums UNIX for Dummies Questions & Answers wildcard Post 62112 by abhi on Friday 11th of February 2005 11:17:07 AM

02-11-2005

Registered User

need help with grep :
down below a11,a1s,a1 r files and for ur info,there r other files also with "a" as their first letter

dsadm@punbi1:/apps/dsadm/Practice/abhi/unix> grep a* a1

a11:this is a copy of a1

a1s:a1 is a1s

a1:a1

dsadm@punbi1:/apps/dsadm/Practice/abhi/unix> grep "a*" a1
this is
a1

1.
if i assume that in first case the shell expands a* to all files that begin with an a, then why r other files not included in output (they all have some data in them).
also if the a* expands to file names then what pattern am i searching for?

2.
plz explain the diffrence bw the two excution?
plz be elaborate..ive been using grep for sometime now but i am completely at a loss explaining the first output

3.during execution of grep, the " " regulate the shell from interpreting the metachars, so does that mean that in case of grep the interpretation of metachars is done by the KERNEL ???? (unlike in commands like ls * , etc)
if yes then isnt calling them SHELL METAQCHARACTERS a misnomer???

plz be elaborate

abhi

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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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