07-13-2011
read man command of zgrep
and look for -E option
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whereis(1) General Commands Manual whereis(1)
NAME
whereis - locate source, binary, and/or manual for program
SYNOPSIS
dir... name...
DESCRIPTION
locates source, binary, and manuals sections for specified files. The supplied names are first stripped of leading path name components
and any (single) trailing extension of the form (such as Prefixes of resulting from use of SCCS are also dealt with. then attempts to
locate the desired program in a list of standard places.
Options
recognizes the following command-line options:
Limit search to binary files.
Can be used in conjunction with or
Limit search to source-code files.
Can be used in conjunction with or
Limit search to manual entry files.
Can be used in conjunction with or
Search for unusual entries.
A file is said to be unusual if it does not have one entry of each requested type. Thus, searches for those files in
the current directory that have no corresponding manual entry.
Limit search to binaries located in one or more specified directories.
Can be used in conjunction with or
Limit search to source files located in one or more specified directories.
Can be used in conjunction with or
Limit search to manual entry files
located in one or more specified directories. Can be used in conjunction with or
Terminates the last directory list
or options) and identifies the start of file names.
EXTERNAL INFLUENCES
International Code Set Support
Single- and multi-byte character code sets are supported.
EXAMPLES
Find all the files in that are not documented in with source files in
WARNINGS
uses the system call (see chdir(2)) to run faster. Therefore, path names given with the and options must be absolute path names.
AUTHOR
was developed by the University of California, Berkeley.
FILES
whereis(1)