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Full Discussion: Basic grep question
Top Forums Shell Programming and Scripting Basic grep question Post 303002507 by kraljic on Saturday 26th of August 2017 01:50:11 AM
Old 08-26-2017
Basic grep question
Shell : Bash shell (Fedora 26)

In the below text file (output.txt), I need to find all lines starting with the pattern pc. As you can see, only one line matches this condition (pc hello world).

But, my below 3 attempts return wrong output. How do I use the grep command correctly here ?


Code:
 # cat output.txt
  sunrpc                331776  1
  crct10dif_pclmul       16384  0
  crc32_pclmul           16384  0
  shpchp                 36864  0
  snd_pcm               102400  4 snd_hda_intel,snd_hda_codec,snd_hda_core,snd_hda_codec_hdmi
  snd_timer              32768  2 snd_seq,snd_pcm
  lpc_ich                24576  0
  pc hello world

  # Attempt1
  # It returns any line with the the pattern pc in it which is not what I want
  # grep 'pc' output.txt
  sunrpc                331776  1
  crct10dif_pclmul       16384  0
  crc32_pclmul           16384  0
  shpchp                 36864  0
  snd_pcm               102400  4 snd_hda_intel,snd_hda_codec,snd_hda_core,snd_hda_codec_hdmi
  snd_timer              32768  2 snd_seq,snd_pcm
  lpc_ich                24576  0
  pc hello world
  # 


  # Attempt2
  # No output returned at all
  # grep 'pc^' output.txt



  # Attempt3 
  # I think this gives the same wrong output as Attempt1 
  # grep 'pc*' output.txt
  sunrpc                331776  1
  crct10dif_pclmul       16384  0
  crc32_pclmul           16384  0
  shpchp                 36864  0
  snd_pcm               102400  4 snd_hda_intel,snd_hda_codec,snd_hda_core,snd_hda_codec_hdmi
  snd_timer              32768  2 snd_seq,snd_pcm
  lpc_ich                24576  0
  pc hello world
  #

 

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LEARN ABOUT SUSE

cpanplus::shell

CPANPLUS::Shell(3pm)					 Perl Programmers Reference Guide				      CPANPLUS::Shell(3pm)

NAME

       CPANPLUS::Shell

SYNOPSIS

	   use CPANPLUS::Shell; 	    # load the shell indicated by your
					    # config -- defaults to
					    # CPANPLUS::Shell::Default

	   use CPANPLUS::Shell qw[Classic]  # load CPANPLUS::Shell::Classic;

	   my $ui      = CPANPLUS::Shell->new();
	   my $name    = $ui->which;	    # Find out what shell you loaded

	   $ui->shell;			    # run the ui shell

DESCRIPTION

       This module is the generic loading (and base class) for all "CPANPLUS" shells. Through this module you can load any installed "CPANPLUS"
       shell.

       Just about all the functionality is provided by the shell that you have loaded, and not by this class (which merely functions as a generic
       loading class), so please consult the documentation of your shell of choice.

BUG REPORTS

       Please report bugs or other issues to <bug-cpanplus@rt.cpan.org<gt>.

AUTHOR

       This module by Jos Boumans <kane@cpan.org>.

COPYRIGHT

       The CPAN++ interface (of which this module is a part of) is copyright (c) 2001 - 2007, Jos Boumans <kane@cpan.org>. All rights reserved.

       This library is free software; you may redistribute and/or modify it under the same terms as Perl itself.

SEE ALSO

       CPANPLUS::Shell::Default, CPANPLUS::Shell::Classic, cpanp

perl v5.12.1							    2010-04-26						      CPANPLUS::Shell(3pm)
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