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Full Discussion: Simple question
Top Forums UNIX for Dummies Questions & Answers Simple question Post 79599 by fdarkangel on Thursday 28th of July 2005 08:53:46 PM
Old 07-28-2005
operator '>' connects a program to a file, whicle '|' connect a program to another program (by making first one's stdout as second's stdin). this command should do what you're trying:

man mail | grep "delete" > delete

what happens is, man echoes the contents of corresponding manual page to stdout. executed with no input files, grep expects input from stdin (usually keyboard, but in this case, because of the pipe character '|', stdin is "man mail"'s stdout). then grep's output is directed to the file named delete.
 

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LEARN ABOUT LINUX

zegrep

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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