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Full Discussion: Combining multiple greps
Top Forums UNIX for Beginners Questions & Answers Combining multiple greps Post 303031161 by Xubuntu56 on Friday 22nd of February 2019 09:24:03 AM
Old 02-22-2019
Combining multiple greps
I'm trying to learn about regular expressions. Let's say I want to list all the files in /usr/bin beginning with "p", ending with "x", and containing an "a".
I know this works:
Code:
ls | grep ^p | grep x$ | grep a

but I'm thinking there must be a way to do it without typing grep three times. Some of my attempts:
Code:
ls | grep '^p' 'x$' 'a'
ls | grep ^p | x$ | [a]
ls | grep -E "[[ ^p ]]+[[ x$ ]]+[[ a ]]"

Ubuntu 18.04.2; Xfce 4.12.3; kernel 4.15.0-45-generic; bash 4.4.19(1); Dell Inspiron-518
 

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LEARN ABOUT LINUX

xzegrep

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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